Syntheses of Some Medium Sized Cyclic Triamines and Their Cobalt(III) Complexes
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概要
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Four cyclic triamines of a medium ring size (9–12-membered ring) which form three mutually-adjacent five- and/or six-membered chelate rings on complexation, such as 1,4,7-triazacyclononane (abbreviated TACN), 1,4,7-triazacyclodecane (TACD), 1,4,8-triazacycloundecane (TACUD), and 1,5,9-triazacyclododecane (TACDD) were synthesized and isolated as their trihydrobromides. The complexation of TACN and TACD with a cobalt-(III) salt yielded metal complexes of a sandwich-type structure, such as [Co(TACN)<SUB>2</SUB>]Br<SUB>3</SUB> and [Co(TACD)<SUB>2</SUB>]Br<SUB>3</SUB>·H<SUB>2</SUB>O, which were then isolated. In the case of TACUD, a complex [Co(TACUD)BrCl<SUB>2</SUB>] containing only one molecule of the triamine was isolated. However, although the formation of a cobalt (III) complex with TACDD in solution was inferred spectroscopically, no expected complex was isolable. On the basis of the spectrophotometric data, the ligand-field strength was found to increase in the following order:<BR>[Co(NH<SUB>3</SUB>)<SUB>6</SUB>]<SUP>3+</SUP><[Co(TACD)<SUB>2</SUB>]<SUP>3+</SUP><[Co en<SUB>3</SUB>]<SUP>3+</SUP><[Co(TACN)<SUB>2</SUB>]<SUP>3+</SUP>.
- 公益社団法人 日本化学会の論文
著者
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Koyama Hiroyuki
Department Of Biotechnology Faculty Of Agriculture Gifu University
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Yoshino Tamotsu
Department of Chemistry, Faculty of Science, Kyushu University
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Yoshino Tamotsu
Department of Chemisty, Faculty of Science, Kyushu University
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Koyama Hiroyuki
Department of Chemisty, Faculty of Science, Kyushu University
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