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Metal complexes of hybrid oxygen-arsenic ligands. Part V. A study of the products fromo-R2AsC6H4CO2M and CrO3 (M = H)/trans-[CrCl2(OH2)4]Cl · 2H2O (M = Na) in acetone

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Summary

A change of the reported medium of reaction oftrans- [CrCl2(OH2)4]Cl · 2H2O witho-R2AsC6H4CO2M (M = Na), from 95% ethanol to acetone, results in the change of an hydroxo — to an oxo — group (R = Ph), in the number of water molecules (R = Et or C6H11) and/or of ligand molecules (R =p-tolyl) in chromium(III)-arsine complexes. However, for R = Me, the same complex is obtained in each case. I.r. spectral data of these complexes favour the chelation of the carboxylate ion and non-coordination of arsenic(III) except for CrO(o-Ph2AsC6H4CO2) · 2.5 H2O in which arsenic(III) of the monotertiary arsine group appears to coordinate to chromium(III). This would seem to be the first example of this type. On the other hand, the reaction of CrO3 witho-R2As- C6H4CO2M (M = H) in 1∶4.5 molar ratio in acetone yields only one type of complex,viz., [Cr3O3(o-R2As(O)C6H4-CO2)2(o-R2AsC6H4CO2)(H2O)6] · n H2O (n = 2, R = Me, C6H11 or Ph; n = O, R = Et). The arsine oxide molecules appear to chelate through As = 0 and the carboxylate oxygens while the arsine ligand binds only through the carboxylate oxygens leaving arsenic(III) uncoordinated as reported for the complexes obtained from the same reactants in 95% ethanol.

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Authors and Affiliations

  1. Department of Chemistry, Guru Nanak Dev University, Amritsar, India

    Swarn S. Parmar,  Harkeerat K. Bharaj & Manohar L. Saighal

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  1. Swarn S. Parmar
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  2. Harkeerat K. Bharaj
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  3. Manohar L. Saighal
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Parmar, S.S., Bharaj, H.K. & Saighal, M.L. Metal complexes of hybrid oxygen-arsenic ligands. Part V. A study of the products fromo-R2AsC6H4CO2M and CrO3 (M = H)/trans-[CrCl2(OH2)4]Cl · 2H2O (M = Na) in acetone. Transition Met Chem 11, 283–286 (1986). https://doi.org/10.1007/BF00620646

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  • DOI: https://doi.org/10.1007/BF00620646

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