Equilibrium study on the reactions of boric acid with some cis -diaqua CrIII-complexes |
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Authors: | G N Mukherjee and Ansuman Das |
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Institution: | (1) Department of Chemistry, University of Calcutta, University College of Science, 92, Acharya Prafulla Chandra Road, 700 009 Kolkata, India |
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Abstract: | Substitution inertcis-diaqua CrIII complexes: cis-(Lx−)CrIII(H2O)2](3−x)+ derived from N-donor ligands (Lx−) viz., bipyridine and 1,10-phenanthroline (x = 0) and N,O-donor ligands viz., nitrilotriacetate and anthranilate N,N-diacetate
(x = 3) titrate as diprotic acids in aqueous solution and enhance the acidity of otherwise weakly acidic boric acid (H3BO3) producing mononuclear and binuclear mixed ligand CrIII-borate complexes: (L)Cr(H2BO4)]x− and (L)Cr(BO4)Cr(L)](1−2x)+ respectively through coordination of the H2O and/or OH− ligands, cis-coordinated in the CrIII-complexes on the electron deficient BIII-atom in H3BO3 with release of protons. Deprotonation of the parent CrIII-complexes and their reactions with H3BO3 have been investigated by potentiometric method in aqueous solution,I = 0.1 mol dm−3 (NaNO3) at 25 ±0.1°C. The equilibrium constants have been evaluated by computerized methods and the tentative stoichiometry of the
reactions have been worked out on the basis of the speciation curves |
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Keywords: | cis-Diaqua CrIII complex— boric acid equilibria mixed ligand CrIII-borate complexes CrIII-borate complexes in solution |
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