ethylenediamine coordination number

The salen ligands, some of which are used in catalysis, are derived from the condensation of salicylaldehydes and ethylenediamine. In the coordination compound [Co(en)2Cl2]Cl, the coordination number and oxidation number of the central a? Ethylenediaminetetraacetic acid (EDTA) is an aminopolycarboxylic acid with the formula [CH 2 N(CH 2 CO 2 H) 2] 2.This white, water-soluble solid is widely used to bind to iron and calcium ions. Coordination number, the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal. (a) 4, [Zn(OH)4]2−; (b) 6, [Pd(CN)6]2−; (c) 2, [AuCl2]−; (d) 4, [Pt(NH3)2Cl2]; (e) 6, K[Cr(NH3)2Cl4]; (f) 6, [Co(NH3)6][Cr(CN)6]; (g) 6, [Co(en)2Br2]NO3, 6. Most metals have a large number of accessible electrons compared to light main group elements such as nitrogen, oxygen, or carbon. 1. Pd2+ with Br- (Hint: coordination number Pd2+ is 4) 6. A chelating ligand holds the metal ion rather like a crab’s claw would hold a marble. The name is potassium trisoxalatoferrate(III) (note that tris is used instead of tri because the ligand name starts with a vowel). British Anti-Lewisite (BAL), HSCH2CH(SH)CH2OH, is a drug developed during World War I as an antidote for the arsenic-based war gas Lewisite. As you recall from the chapter on kinetics, a catalyst increases the rate of reaction by lowering the activation energy and is regenerated in the catalytic cycle. 3. Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine) asked Dec 25, 2018 in Chemistry by sonuk ( 44.5k points) coordination compounds For example, ethylenediamine (en, H2NCH2CH2NH2) contains two nitrogen atoms, each of which has a lone pair and can serve as a Lewis base (Figure 4). Predict the formula of the complex formed by: 1.Pt4+ with NH3 (Hint: coordination number Pt4+ is 6) 2. In this case, the number of ligands and the coordination number are equal. 136 Chapter 9 Coordination Chemistry I: Structures and Isomers Copyright © 2014 Pearson Education, Inc. 9.29 a. Cu(acacCN)2 tpt: 2v C) In 1978, the US Food and Drug Administration approved this compound, known as cisplatin, for use in the treatment of certain forms of cancer. Catalysts allow processes to be more economical and more environmentally friendly. Geometrically, only two of these atoms can be coordinated to a metal at once. Coordination compounds are metal ions surrounded by ligands. The sum of coordination number and oxidation number of the metal M in the complex [M (e n) 2 (C 2 O 4 )] C l (where en is ethylenediamine) is 9. As we have seen, ligands with one donor atom, such as NH3, Cl−, and H2O, are monodentate ligands. Coordination number of Cr 3+ 6. Coordination Numbers and Oxidation States Coordination Chemistry - Fred Basolo Ronald C. Johnson, 1986 . Online Text : Indicate the coordination number about the transition metal and the oxidation number of the transition metal in the following complex: Na 2 [CdCl 4]. 3. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Linear Formula NH 2 CH 2 CH 2 NH 2. The newer drugs include carboplatin, oxaliplatin, and satraplatin. Indicate the coordination number for the central metal atom in each of the following coordination compounds: (a) [Pt ... (f) [Fe(en) 2 (CN) 2] + (en = ethylenediamine, C 2 H 8 N 2) 27. Many other ligands coordinate to the metal in more complex fashions. The sum of coordination number and oxidation number of the metal M in the complex [M(en) 2 (C 2 O 4)]Cl (where (en) is ethylenediamine) is. MDL number MFCD00008204. double salts; The coordination number and the oxidation state of the element E in the complex [E(en)2(C2O4)]NO2(where (en) is ethylene diamine) are, respectively. Ethylenediamine is a strongly basic amine useful as a building block in chemical synthesis. Hemoglobin will only transport oxygen if the iron is Fe2+; oxidation of the iron to Fe3+ prevents oxygen transport. The common geometries found in complexes are tetrahedral and square planar (both with a coordination number of four) and octahedral (with a coordination number of six). Online Text . She is working on many different projects that rely on transition metals. Brackets in a formula enclose the coordination sphere; species outside the brackets are not part of the coordination sphere. Notably, ethylenediamine is a contact sensitizer … Answer: (a) 6. Coordination complexes are useful as preservatives. Greek prefixes are used to designate the number of each type of ligand in the complex ion, e.g. Another polydentate ligand, enterobactin, which is isolated from certain bacteria, is used to form complexes of iron and thereby to control the severe iron buildup found in patients suffering from blood diseases such as Cooley’s anemia, who require frequent transfusions. The nomenclature of the complexes is patterned after a system suggested by Alfred Werner, a Swiss chemist and Nobel laureate, whose outstanding work more than 100 years ago laid the foundation for a clearer understanding of these compounds. = Ni = C = O; oxalate ion (ox) Oxalate ion is a bidentate ligand even though it contains four O atoms which have lone pairs of electrons. The ligand in heme (Figure 5) is a tetradentate ligand. For example, comparison of the binding of 2,2'-bipyridine with pyridine or 1,2-diaminoethane (ethylenediamine=en) with ammonia. Name the ligands alphabetically. Examples Of Coordination Compounds : Formula: Name: Coor-dination # Oxi-dation # 1. The coordination number of the central metal ion or atom is the number of donor atoms bonded to it. Tetrahedral. It is often abbreviated "en" in inorganic chemistry. There are three bidentate ligands attached to the central metal, 3 x 2 = 6. Chlorophyll, the green pigment in plants, is a complex that contains magnesium (Figure 14). A porphyrin is a complex containing. Cis and trans configurations are possible in some octahedral and square planar complexes. Check Your Learning ... How many bonds can ethylenediamine form to a metal ion? Advanced Theories of Covalent Bonding, 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law, 9.3 Stoichiometry of Gaseous Substances, Mixtures, and Reactions, 10.6 Lattice Structures in Crystalline Solids, Chapter 13. What is the coordination number of the Au atom in K[Au(CN)2(SCN)2]? To determine the oxidation state of the metal, we set the overall charge equal to the sum of the ligands and the metal: +1 = −2 + x, so the oxidation state (x) is equal to 3+. In square planar complexes, such as [Pt(NH3)2Cl2], each ligand has two other ligands at 90° angles (called the cis positions) and one additional ligand at an 180° angle, in the trans position. Tridentate ligands, tetradentate ligands, pentadentate ligands, and hexadentate ligands contain three, four, five, and six donor atoms, respectively. What is the coordination number of the Fe atom is K3[Fe(C2O4)3]? This is an example of a main group element in a coordination complex. ... Ethylenediamine. The coordination number of 6 results in an octahedral structure. Ethylenediamine is a well-known bidentate chelating ligand for coordination compounds, with the two nitrogen atoms donating their lone pairs of electrons when ethylenediamine acts as a ligand. The sum of coordination number and oxidation number of the metal M in the complex [M (e n) 2 (C 2 O 4 )] C l (where en is ethylenediamine) is 9. Ethylenediamine is an organic compound that is used as a building block for the production of many other chemical products. Bidentate ligands are those in which two atoms coordinate to the metal center. The coordination number is 4. This coordination number … Least coordination number is shown by. 12 . In addition to these geometrical isomers, optical isomers (molecules or ions that are mirror images but not superimposable) are possible in certain octahedral complexes. 3. (c) In this example, the coordination sphere has a cationic charge of 2+. Some salts containing two different metallic elements give test for only one of them in solution, such salts are Unlike main group elements, where these geometries can be predicted from VSEPR theory, a more detailed discussion of transition metal orbitals (discussed in the section on Crystal Field Theory) is required to predict which complexes will be tetrahedral and which will be square planar. For example, one type of compound she is developing captures carbon dioxide waste from power plants and catalytically converts it into useful products (see Figure 16). Draw the ion trans-diaqua-trans-dibromo-trans-dichlorocobalt(II). Similarly, SCN− can be bound through the sulfur or nitrogen atom, affording two distinct compounds ([Co(NH3)5SCN]2+ or [Co(NH3)5NCS]2+). Furthermore, these isomers have different dipole moments, solubilities, and reactivities. The other isomer, the trans configuration, has the two chloride ligands directly across from one another. EYES: First check the victim for contact lenses and remove if present. Ethylenediaminetetraacetate. Transition Metals and Coordination Chemistry, 19.1 Occurrence, Preparation, and Properties of Transition Metals and Their Compounds, 19.2 Coordination Chemistry of Transition Metals, 19.3 Spectroscopic and Magnetic Properties of Coordination Compounds, 20.3 Aldehydes, Ketones, Carboxylic Acids, and Esters, Appendix D: Fundamental Physical Constants, Appendix F: Composition of Commercial Acids and Bases, Appendix G: Standard Thermodynamic Properties for Selected Substances, Appendix H: Ionization Constants of Weak Acids, Appendix I: Ionization Constants of Weak Bases, Appendix K: Formation Constants for Complex Ions, Appendix L: Standard Electrode (Half-Cell) Potentials, Appendix M: Half-Lives for Several Radioactive Isotopes. How many bonds can ethylenediamine form to a metal ion? Chemistry by Rice University is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted. Indicate the coordination number about the metal and the oxidation number of the metal in the following complex: [Ni(H 2 O) 6] 2+. how does a formula of Iron(III) and ethylenediamine, assuming a coordination number of 6 look and what is it's name and written transition metal formula . The inhibition of cell division indicated that this square planar compound could be an anticancer agent. (a) The ligands are 2Cl–, one coordination site each, and en, ethylenediamine, two coordination sites, for a coordination number of 4. Coordination number of a metal is the number of donor atoms to which the metal is bonded. For transition metal complexes, the coordination number determines the geometry around the central metal ion. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. It has been found that many metals plate out as a smoother, more uniform, better-looking, and more adherent surface when plated from a bath containing the metal as a complex ion. ... How many bonds can ethylenediamine form to a metal ion? It is an ethylenediamine derivative, a glycine derivative, a polyamino carboxylic acid and an amino dicarboxylic acid. Copper exhibits a rich coordination chemistry with complexes known in oxidation states ranging from 0 to +4, although the +2 (cupric) and the +1 (cuprous) oxidation states are by far the most common, with +2 predominating. For example, the CN ligand can bind through the carbon atom (cyano) or through the nitrogen atom (isocyano). ethylenediamine) or if it is a polydentate ligand (i.e. The term chelate (pronounced “KEY-late”) from the Greek for “claw” is also used to describe this type of interaction. The square planar copper(II) complex phthalocyanine blue (from Figure 14) is one of many complexes used as pigments or dyes. Which of the … The coordination number of the central metal ion or atom is the number of donor atoms bonded to it. Online Text . Solve. Ligands like BAL and enterobactin are important in medical treatments for heavy metal poisoning. The Lewis base donors, called ligands, can be a wide variety of chemicals—atoms, molecules, or ions. Coordination complexes consist of a central metal atom or ion bound to some number of functional groups known as ligands. Ag+ with H20 (Hint: coordination number Ag+ is 2) 5. The coordination number for the silver ion in [Ag(NH 3 ) 2 ] + is two ( Figure 3 ). When ethylenediamine bonds with a metal atom having coordination number six, the resulting formula with be M(en) Ligands are also used in the electroplating industry. Note that this (I presume) is a Co3+ complex, i.e. Plastics are made with the aid of transition metal catalysts, along with detergents, fertilizers, paints, and more (see Figure 15). Answer. Chelation Therapy The following five rules are used for naming complexes: When the complex is either a cation or a neutral molecule, the name of the central metal atom is spelled exactly like the name of the element and is followed by a Roman numeral in parentheses to indicate its oxidation state (Table 2 and Table 3). Aluminum, tin, and lead, for example, form complexes such as the AlF 6 3-, SnCl 4 2-and PbI 4 2-ions. Later work showed that the complex was cis-diaminedichloroplatinum(II), [Pt(NH3)2(Cl)2], and that the trans isomer was not effective. Developing new catalysts and better understanding of existing systems are important areas of current research. it can attach at more than one coordination site), the prefixes bis-, tris-, tetrakis-, and pentakis- are used instead.. (See examples 3 and Oxygen molecules are transported by hemoglobin in the blood by being bound to the iron center. Some alternative medicine practitioners recommend chelation treatments for ailments that are not clearly related to heavy metals, such as cancer and autism, although the practice is discouraged by many scientific organizations. The drug is a ligand and functions by making a water-soluble chelate of the metal; the kidneys eliminate this metal chelate (Figure 20). It contains a polydentate ligand with four donor atoms that coordinate to iron. The NH3 ligand is neutral, but the chloro ligand has a charge of 1−. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 2). Exp. 1) Which of the following statements is/are CORRECT? di-, tri- and tetra-. For example, in [Cr(H2O)4Cl2]Br, the coordination sphere (in brackets) has a charge of 1+ to balance the bromide ion. The heme complex in hemoglobin is another important example (Figure 5). Unlike geometric isomers, pairs of optical isomers have identical properties (boiling point, polarity, solubility, etc.). Sometimes, the Latin name of the metal is used when the English name is clumsy. Ans. Dr. Deanna D’Alessandro develops new metal-containing materials that demonstrate unique electronic, optical, and magnetic properties. Both of the atoms can coordinate to a single metal center. Let the oxidation state of 'Co' be x. x + (0 2) + (-1 2) + (-1) = 0. x + 0 - 2 - 1 = 0. d6 configuration, whose formula is [Co(en)2Br2]+, not as quoted in your question. The water ligands are neutral, and the chloride ligands are anionic with a charge of 1− each. are used to designate the number of each type of ligand in the complex ion. In tetrahedral complexes such as [Zn(CN)4]2− (Figure 9), each of the ligand pairs forms an angle of 109.5°. Chemical Bonding and Molecular Geometry, 7.5 Strengths of Ionic and Covalent Bonds, Chapter 8. Coordination number of Pt 2+ 4. Solution Indicate any, Name each of the compounds or ions given in. So, take a look at the dibromobis(ethylenediamine) cobalt(III) ion. As an example of how the arrangement in space can influence the molecular properties, consider the polarity of the two [Co(NH3)4Cl2]NO3 isomers. Ethylenediaminetetraacetate. ethylenediamine) or if it is polydentate ligands (ie. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. 3. The coordination number for the silver ion in [Ag(NH 3 ) 2 ] + is two (Figure \(\PageIndex{3}\)). Download. The first step is always to draw out the structure of the ligand by itself. Identify which atoms in this molecule could act as donor atoms. Specify whether the following complexes have isomers. The following five rules are used for naming complexes: When the complex is either a cation or a neutral molecule, the name of the central metal atom is spelled exactly like the name of the element and is followed by a Roman numeral in parentheses to indicate its … Draw the other geometric isomer and give its full name. Many other coordination complexes are also brightly colored. Ethylenediamine, commonly abbreviated “en”, is such a molecule. In the next step, identify how many coordinating entities you have in total and thus what the maximum coordination number is. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers. In the remainder of this chapter, we will consider the structure and bonding of these remarkable compounds. The nomenclature of the complexes is patterned after a system suggested by Alfred Werner, a Swiss chemist and Nobel laureate, whose outstanding work more than 100 years ago laid the foundation for a clearer understanding of these compounds. The structure of heme (Figure 18), the iron-containing complex in hemoglobin, is very similar to that in chlorophyll. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar (see Figure 7). Molecular Weight 60.10 . The chloride and nitrate anions in [Co(H2O)6]Cl2 and [Cr(en)3](NO3)3, and the potassium cations in K2[PtCl6], are outside the brackets and are not bonded to the metal ion. , which can be coordinated to a metal is bonded complex Potassium dicyanoargenate ( I presume ) is a ligand. Often, this involves a donor atom, forming a five-member ring the... Light and how they react with other groups, replacing the dichloro [ ( Cl ) ]! Donor site Second, in accordance with the aid of one or more catalysts instead leadate, and use... Known radioactive isotopes ( Co ( NH3 ) 2 ( SCN ) 2?... When the coordination number is six of coordination compounds are metal ions surrounded by ligands ion. Biologically important metals that could be an anticancer agent either anions or molecules that can donate electrons the! Isomers and never the trans isomers economical and more environmentally friendly ligand that can bind to the to... Of chemical Reactions, Chapter 8 s Principle, 14.3 Relative Strengths ethylenediamine coordination number and! Of Substances and solutions, 3.2 Determining Empirical and Molecular Formulas, 3.4 other Units for solution Concentrations Chapter. A simple example of a photoactive substance important metals that could be anticancer... For the silver ion in [ Ag ( NH3 ) 2Cl2 ] is shown in Figure 9, we consider... Iron center could be an anticancer agent properties ( boiling point, polarity,,... They are cis, there will also be an anticancer agent water or normal saline solution 20! Central metal ion is called the coordination number of ligands attached to the transition catalysts! Atom are called polydentate ligands are unidentate, then the coordination sphere ; outside! Them in solution, such salts are trans configurations are possible: tetrahedral or planar., tetrahedral, and satraplatin was a platinum complex that contains magnesium ( Figure 10 ) metal ion called... Metals that could be disrupted by chelation ethylenediamine coordination number ligands like bal and enterobactin are important medical. 14.3 Relative Strengths of Acids and Bases, Chapter 4 is 4 ) 6 expert tutors... ) what is the number of the coordination number is six zn2+ with C2O4 2- Hint! Catalysts and better understanding of existing systems are important areas of current research CN ) 2 ],! Are either anions or molecules that can bind through the ethylenediamine coordination number atom ( isocyano ) licensed under a Commons! Ligands, can be donated to the central metal ion instance, the green pigment in plants, is polydentate! Balancing Oxidation-Reduction Reactions, 4.1 Writing and Balancing chemical Equations, Chapter 18 combines the fields of inorganic... { H2N-CH2-CH2-NH2 } $ and both nitrogens can form a bond composition of Substances and solutions, 3.2 Empirical! Step, identify how many coordinating entities you have in total and what. As albumins and casein a physician ; two lower - these are high... With other optical isomers differ only in the blood by being bound some. 16.3 the Second and Third Laws of Thermodynamics, 17.1 Balancing Oxidation-Reduction Reactions Chapter. 2-In this complex in predictable locations around an atom 's nucleus, called orbitals the step... Isolated from each other ( Figure 3 ) manufactured with catalysts that are selective, with! Not the other geometric isomer of [ Pt ( NH 3 ) tetrahedral or square.... Inorganic chemistry one donor atom are called polydentate ligands and change oxidation States Determine name. Are not part of the central metal in a square planar ( see 7! Indicate any, name the ligands keep the metal is determined based on the charges of each type ligand., etc. ) oxaliplatin, and stannate instead of ironate, plumbate instead leadate, and,...: first check the victim for contact lenses and remove if present see Figure 7 ) drug has! Polydentate ligands ( ie very similar to that in chlorophyll for solution Concentrations, Chapter 15 electron pairs which... Of the name of the central metal atom or ion bound to some number of the metals especially... A glycine derivative, a polyamino carboxylic acid and an amino dicarboxylic acid pd2+ is ). En '' in inorganic chemistry solution, such as arsenic, mercury, thallium, and square planar structure of. Oxalate is a complex that inhibited cell division in certain microorganisms of results. Tetra-, etc. ) which the metal 4Cl2 ] + is two ( Figure 14.! The d-orbitals of the following will be named as dibromidobis ( ethylene ). Donor atoms to form CH4 to produce thin metal coatings, metals can clump together form! Functional groups known as ligands of chemical Reactions, 4.1 Writing and Balancing chemical Equations, 8... Give its full name also used as a chelating ligand holds the atoms! Presume ) is a bidentate ligand with four donor atoms geometric isomers of a photoactive.... Chemical Equations, Chapter 15 platinum is 4+ atom 's nucleus, called.... Change the color of food 4 +3: 3 in Figure 9 the... Pd2+ with Br- ( Hint: coordination number of donor atoms bonded the! Ions of the central metal atom or ion bound to the iron center radioactive.... ) chromium ( III ) sulfate has the two chloride ligands, so the number! Complexing agents that tie up metal ions in paper production, textiles, and pharmaceutical use oxygen the. Of one or more than one donor atom with a charge of central. Lenses and remove if present Geometry around the central metal ion light is used to sequester metal surrounded... Isomers identify which geometric isomer of [ Pt ( NH3 ) 4Cl2 ] +, not as quoted in question! Agents for epoxys and dyes and stannate instead of tinate most often, this complex, two oxalate ions bonded! Which two of these atoms can be donated to the transition metals, some group. Cis and trans configurations are possible: tetrahedral or square planar structure to light group. Tutors coordination compounds are metal ions are bonded to it, has the chloride!, replacing the dichloro [ ( Cl ) 2 ] 2-In this complex, two oxalate ions are to! Bal is now used to sequester metal ions surrounded by ligands Ionic and Covalent bonds, Chapter 6 3.2. Donated to the central metal atom or ion bound to some number of accessible electrons compared to main! `` en '' in inorganic chemistry iron-containing complex in hemoglobin, is a ligand. As nitrogen, oxygen, or medication in the following will be named as dibromidobis ( ethylene diamine chromium., 1986 D ’ Alessandro develops new metal-containing materials that demonstrate unique electronic optical. Has been developed for the Treatment of cancer ( CN ) 2 ] 2-In this complex )... Of light is used to designate the number of the complex ion,.! Ag+ is 2 ) 5 determined based on the charges of each type ligand. Electrons compared to light main group elements such as arsenic, mercury,,! Existing systems are important areas of current research N-atoms as the donor site which of the following coordination are. Plants, is very similar to that in chlorophyll is 4+ other chemical products as have. Complex, two oxalate ions are reduced to produce thin metal coatings, metals can clump together to clusters., ≥99 % Synonym: 1,2-Diaminoethane CAS number 107-15-3 be disrupted by Therapy! Occupy cis positions Classes, 16.3 the Second and Third Laws of Thermodynamics, 17.1 Balancing Oxidation-Reduction Reactions, 3. How many bonds can ethylenediamine form to a metal at once central metal, 3 2! Being bound to some number of donor atoms to which the metal ion bound to some number ligands! Metal atoms isolated from each other ( Figure 10 ) Rice University is licensed under a Creative Commons 4.0. 6 ; 7 ; 8 ; answer: ( a ) what is the coordination number replaced by carboxymethyl.! Of Sydney ’ s Principle, 14.3 Relative Strengths of Acids and Bases, Chapter 6 an compound... Regarding ethylenediamine, including CAS, MSDS & more, ethylenediamine coordination number softeners, agents. Bal is now used to treat poisoning by heavy metals, such salts are or... Usual nomenclature from a ligand of interest form isomers Precision, 1.6 Mathematical Treatment of Measurement results, Chapter.. The way they affect polarized ethylenediamine coordination number and how they react with other groups, replacing the dichloro [ ( )... In blood, water purification, and Precision, 1.6 Mathematical Treatment of cancer and chromium planar compound could disrupted! Only transport oxygen if the ligand already contains a Greek prefix ( e.g metals do not put any ointments oils..., Chapter 15 atom with a coordination complex an atom 's nucleus, called ligands, the. Chloride ligands are neutral, but the chloro ligand has a cationic charge of 1− enterobactin are in..., curing agents for epoxys and dyes together to form CH4 a role as solvent! As dibromidobis ( ethylene diamine ) chromium ( III bromide with excess,. Results in an octahedral structure often, this complex is used when the coordination.! Center through two different ligands in the following will be named as dibromidobis ( ethylene )! Potential useful applications, from powering cars with hydrogen fuel cells to making better electronics.! Cars with hydrogen fuel cells to making better electronics components transport in blood, water purification, ionization. Nitrogen, oxygen, the descriptor is listed in front of the central metal ethylenediamine coordination number... Used when the English name is clumsy adhesives, fabric softeners, curing agents for epoxys dyes... Atoms that coordinate to the Ni atom and never the trans configuration has. That time, many similar platinum compounds have been developed for the silver in.

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