Binary and ternary complexes involving manganese(II), 2,2’-bipyridine and halide or thiocyanate ions inN,N-dimethylformamide |
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| Authors: | Morito Komiya Satoshi Yoshida Shin-ichi Ishiguro |
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| Institution: | (1) Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, 812-81 Higashiku, Fukuoka, Japan;(2) Department of Electronic Chemistry, Tokyo Institute of Technology at Nagatsuta, Yokohama 226, Midori-ku, Japan |
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| Abstract: | Ternary complexation involving the manganese(II) ion, 2,2’-bipyridine (bipy), and halide (chloride, bromide) or pseudohalide
(thiocyanate) ions has been studied by precise titration calorimetry inN,N -dimethylformamide (DMF) at 298K. All the titration curves are explained well in terms of formation of mononuclear complexes
of the type MnXm(bipy)n](2-m) + (X = CI, Br or SCN), and the formation of MnCl(bipy)]+, MnCl2(bipy)], MnCl(bipy)2]+ and MnCl2(bipy)2] has been established in the chloride system, MnBr(bipy)]+, MnBr2(bipy)], MnBr(bipy)2]+ in the bromide system, and Mn(NCS)(bipy)]+, Mn(NCS)2(bipy)], Mn(NCS)3(bipy)]-, Mn(NCS)(bipy)2]+, and Mn(NCS)2(bipy)2] in the thiocyanate system. The data were analyzed on the basis of the thermodynamic parameters for the binary MnlIbipy and MnII-X (X = Cl, Br and SCN) systems, the latter being determined in previous work. The formation constants, reaction enthalpies,
and entropies of the ternary complexes were extracted. The thermodynamic parameters thus obtained are discussed in comparison
with those of the corresponding systems of other transition metal(II) ions. |
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| Keywords: | Ternary complexation manganese(II) halides thiocyanate 2 2-bipyridine N N-dimethylformamide calorimetry |
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