1993 Fiscal Year Final Research Report Summary
"Dinucleating Ligand Complexes Having Two Cyclam Rings Connected by Xylylene Group"
| Project/Area Number |
04453041
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機・錯塩・放射化学
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| Research Institution | TOHOKU UNIVERSIYU |
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Principal Investigator |
ITO Tasuku Tohoku University, Department of Chemistry, Faculty of Science, Professor, 理学部, 教授 (90007328)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Tadashi Tohoku University, Department of Chemistry, Faculty of Science, Researcj Associa, 理学部, 助手 (40230362)
KIDO Hiroaki Tohoku University, Department of Chemistry, Faculty of Science, Research Associa, 理学部, 助手 (40004444)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Dinuclear Complex / Polynuclear Metal Complex / Dinucleating Ligand |
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| Research Abstract |
The objective of this study was to synthesize a dinucleating ligand (L) having two cyclam rings in a molecule, to make its demetallic complexes with the cofacial ring arrangement, and to use of the demetallic site. Following results have been obtained.
1 We succeeded in the preparation of new dinucleating ligand (L) in which two dimethyl cyclams are connected at 6th position with ortho-xylylene group.
2 With use of this ligand, we prepared new dinuclear complexes of nickel(II), zinc(II), cobalt(III), cadmium(II), ruthenium(III).
3 Single crystal X-ray analyzes were carried out on three crystalline compounds. In all the structures, two cyclam rings are arranged in a face-to-face manner as expected. The two metallic sites are bridged by halide ion or carbonate ions and intermetallic separations were in the range of 5.4 - 5.8A.
4 In order to construct the face-to-face structure, we put methyl groups on the cyclam skeleton on purpose. This synthetic strategy was verified by preparing a similar dinucleating ligand without methyl groups and analysing the X-ray structure of its dinickel(II) complex.
5 We obtained the following results on the use of the dimetallic site.
(1) Dizinc complex [Zn_2(L)]^<4+> takes up carbon dioxide spontaneously from the air to give mu-carbonato dizinc comple with the cofacial ring arrangement.
(2) In the solid state, chloro-bridged dinickel(II) complex [Ni_2(mu-Cl)Cl_2(L)]^+ has a pseudo one dimensional Ni-Cl alternate linear chain structure. Among Ni(II) ions, two types of antiferromagnetic interactions operate with J=-48.2(3), J'=-11.2(3)cm^<-1>.
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Research Products
(6 results)
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[Publications] Hiroaki Kido, Makoto Takada, Masaaki Suwabe, Tadashi Yamaguchi, and Tasuku Ito: ""Preparation of a Flexible Dinucleating Ligand, alpha, alpha'-Bis(1,4,8,11-tetraazacyclotetradecane-6-yl)-p-xylene(L) and Structure of Its Dinickel(II) Complex, [Ni_2(L)]^<4+>"" Submitted for publication.
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