Novel asymmetric heterobimetallic complexes of transition metals and the kinetics of oxygen binding to a cobalt(II) complex |
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Authors: | Athar Fareeda Arjmand Farukh Tabassum Sartaj |
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Institution: | (1) Department of Chemistry, Aligarh Muslim University, Aligarh –, 202002, India |
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Abstract: | A series of asymmetric heterobimetallic complexes of the type LML Sn]Cl and LM L Sn]Cl2, where L = ethylene diamine, M = MnII, CoII, NiII and CuII, M = CrIII and FeIII and L = 1-tryptophan and 1-valine, have been synthesized and characterized by elemental analyses, u.v.–vis., i.r., e.p.r., n.m.r., cyclic voltammetry and conductivity measurements. The CoIII analogue of these complexes was characterized by two dimensional n.m.r. COSY data. The kinetics of oxygen binding with the complex C15H23N4O2SnCo]Cl has also been studied. The kinetic data proves that CoII of a coordinated molecule participates in the rate-determining step of the dioxygen binding process. The plots of the pseudo-first-order rate k
obs
versus O2] are linear passing through an intercept. The electrochemical behaviour of C15H23N4O2SnCo]2+ and C15H23N4O2SnCu]+ was monitored by cyclic voltammetry. Comparison of the electrochemical properties of CoIIISnIV]2+ and CuIISnIV]+ reveal that, in both the species, one electron transfer reaction takes place. For the CoIIISnIV]2+ species E
0 = 0.272 and –1.1 V and for the CuIISnIV]+ species E
0 = 0.078 and –0.300 V values were obtained, respectively. |
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Keywords: | |
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