Visser, HGLeipoldt, JGPurcell, WMonstert, D2007-02-072007-06-072007-02-072007-06-071994-04Visser, HG, et al. 1994. Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions. Polyhedron, vol 13, 7 June, pp 1051-10550277-5387http://hdl.handle.net/10204/1596http://hdl.handle.net/10204/1596The reaction of NH4[Cr(NTA)(H2O)2] (NTA = nitrilotriacetic acid) with H+ has been studied at different temperatures and a rate constant of 1.27(3) x 10(-2) S-1 was obtained at 25.1-degrees-C. It is proposed that the reaction involves the formation of an ion pair, followed by the protonation of one of the carboxylate groups of the NTA ligand bonded to the central metal ion. This results in the formation of the [Cr(eta3-NTA)(H2O)3]+ complex. The substitution reactions between [Cr(NTA)(H2O)2]/[Cr(NTA)(OH)(H2O)]- and different ligands (NCS- and EBT-:EBT-= Eriochrome Black T) were also studied. The second-order rate constant for the reaction of NCS- with the [Cr(NTA)(H2O)2] complex at 35.0-degrees-C was 9.1(1) x 10(-3) M-1 s-1 and that for the reaction of EBT- with the metal complex at 30.0-degrees-C was 9.5(6) x 10(-2) M-1 s-1. The increase in substitution rate for the reaction between [Cr(NTA)(H2O)2] and EBT- is attributed to the chelation of the EBT- ligand during this reaction.530152 bytesapplication/pdfenCopyright: 1994 Pergamon-Elsevier Science LtdNitrilotriacetic acidEBT ligandsNTANCS ligandsArticleVisser, H., Leipoldt, J., Purcell, W., & Monstert, D. (1994). Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions. http://hdl.handle.net/10204/1596Visser, HG, JG Leipoldt, W Purcell, and D Monstert "Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions." (1994) http://hdl.handle.net/10204/1596Visser H, Leipoldt J, Purcell W, Monstert D. Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions. 1994; http://hdl.handle.net/10204/1596.TY - Article AU - Visser, HG AU - Leipoldt, JG AU - Purcell, W AU - Monstert, D AB - The reaction of NH4[Cr(NTA)(H2O)2] (NTA = nitrilotriacetic acid) with H+ has been studied at different temperatures and a rate constant of 1.27(3) x 10(-2) S-1 was obtained at 25.1-degrees-C. It is proposed that the reaction involves the formation of an ion pair, followed by the protonation of one of the carboxylate groups of the NTA ligand bonded to the central metal ion. This results in the formation of the [Cr(eta3-NTA)(H2O)3]+ complex. The substitution reactions between [Cr(NTA)(H2O)2]/[Cr(NTA)(OH)(H2O)]- and different ligands (NCS- and EBT-:EBT-= Eriochrome Black T) were also studied. The second-order rate constant for the reaction of NCS- with the [Cr(NTA)(H2O)2] complex at 35.0-degrees-C was 9.1(1) x 10(-3) M-1 s-1 and that for the reaction of EBT- with the metal complex at 30.0-degrees-C was 9.5(6) x 10(-2) M-1 s-1. The increase in substitution rate for the reaction between [Cr(NTA)(H2O)2] and EBT- is attributed to the chelation of the EBT- ligand during this reaction. DA - 1994-04 DB - ResearchSpace DP - CSIR KW - Nitrilotriacetic acid KW - EBT ligands KW - NTA KW - NCS ligands LK - https://researchspace.csir.co.za PY - 1994 SM - 0277-5387 T1 - Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions TI - Substitution and protonation reactions of nitrilotriaceta tochromium(lll) ions UR - http://hdl.handle.net/10204/1596 ER -