Some Mixed-Ligand Manganese(III) Complexes Produced by the Reactions of Tris(acetylacetonato)manganese(III) with Hydrogen Halides in Organic Solvents
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概要
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Although tris(acetylacetonato) manganese(III) is reduced by hydrogen halides in organic solvents, ultimately resulting in manganese(II) chloride, bromide or bis(acetylacetonato)manganese(II), the equimolar reactions afforded the intermediary manganese(III) products MnX(acac)<SUB>2</SUB>, where X is Cl, Br, or I. These mixed-ligand complexes were characterized by measurements of electronic and infrared spectra, molecular weight, electric conductivity and magnetic susceptibility, and concluded to exist as a five-coordinate molecule in non-coordinating solvents, but behave as a uni-uni valent electrolyte in methanol. Six-coordinate complexes [Mn(acac)<SUB>2</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>]Br·2H<SUB>2</SUB>O and MnX(acac)<SUB>2</SUB>B were also derived therefrom, where B is 4-methylpyridine, pyridine oxide or dioxahe. Further reaction of MnCl(acac)<SUB>2</SUB> with equimolar hydrogen chloride in methylene chloride at −78 °C produced MnCl<SUB>2</SUB>(acac)(O-py)<SUB>2</SUB> or MnCl<SUB>2</SUB>(acac)H<SUB>2</SUB>O in the presence or absence of pyridine oxide (O-py), respectively, but the corresponding dibromo and diiodo complexes could not be obtained in similar reactions with hydrogen bromide or iodide.
- 公益社団法人 日本化学会の論文
著者
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Isobe Kiyoshi
Department Of Agricultural Chemistry Faculty Of Agriculture Shizuoka University
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Kawaguchi Shinichi
Department Of Fundamental Energy Science Graduate School Of Energy Science Kyoto University
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