2006 Fiscal Year Final Research Report Summary
Fine regulation of spin-crossover behavior by coordination effect and assembly effect
| Project/Area Number |
17350026
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
KAIZAKI Sumio Osaka University, Graduate School of Science, Professor, 大学院理学研究科, 教授 (20089874)
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| Co-Investigator(Kenkyū-buntansha) |
KAWATA Satoshi Osaka University, Graduate School of Science, Associate Professor, 大学院理学研究科, 助教授 (10211864)
FUYUHIRO Akira Osaka University, Graduate School of Science, Assistant Professor, 大学院理学研究科, 助手 (90156951)
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| Project Period (FY) |
2005 – 2006
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| Keywords | iron(II) complexes / magnetic susceptibility / coordination effect / assembly / spin-crossover |
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| Research Abstract |
1) Relaxation process of the light-induced spin-crossover in two-step spin-crossover diiorn(II) dinuclear complex, [{Fe(4ph-py)(NCNH_3)}_2(μ-bpypz)], were measured by Prof.K.Boikheddaden at Versailes University in France. This result show the relxation process is associated with the incubation, which might be related to the [High-spin-high-spin]…[low-spin-low-spin] species at the middle point of the two-step spin-crossover.
2) The variable temperature magnetic susceptibility, X-ray crystallography, and Mossbauer and Raman spectra of a new dinuclear complex-based one-dimensional coordination polymer [{Fe^<II>_2(NCS)_2(μ-bpypz)_2]}(μ-4,4'-bpy)]・ MeOH demonstrated a steep one-step [HS-HS] to [LS-LS] spin transition.
3) We have firstly shown that bpypz" and iron(II) salts undergo homo-chiral self-assembly into the bis triple stranded cluster helicate in which the [Fe_3O]^<4+>core is stabilized by bridging the two mononuclear [Fe^<II>(bpypz)_3]^-units. A [Fe^<II>_3O]^<4+> cluster-core is wrapped by two terminal [Fe^<II>(bpypz)_3]^-units as a candy in a wrap to form a five nuclear bis triple-stranded helicate. This is indeed the first example of the assembly that includes the oxo-centered trinuclear iron(II) core. This synthetic approach could provide new perspectives on the preparation of complex and stable helicates with high nuclearity and programmed properties
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