Reaction of trans-[Co(en)2(SO3)(H2O)]+ with imidazole and containing ligands |
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| Authors: | HF Rexroat NS Rowan |
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| Institution: | Department of Chemistry, The American University, Washington, DC 20016, U.S.A. |
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| Abstract: | trans-Co(en)2(SO3)(H2O)]+ reacts with imidazole (ImH) and imidazole containing ligands (L) to form trans-Co(en)2(SO3)L]+ in the pH range 6.0–9.0. The complex seems to react both in the hydroxy and in the aquo form. The rate constant for the reaction of imidazole with the aquo form is 6.0±0.7 and 4±1M?1s?1 for the reaction with the hydroxy form at 25°C. The apparent equilibrium constant for formation of the imidazole complex at pH 7 is consistent with the value of 3 x 102 measured previously. Appreciable amounts of complex form only in the pH 6–9 range. Above pH 9 NMR spectra show that even the immediate products are different. In aged solutions at all pHs other products form. |
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| Keywords: | Author to whom correspondence should be addressed |
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