2003 Fiscal Year Final Research Report Summary
Development of light functional materials based on the collective phase
| Project/Area Number |
13440197
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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 | Kyushu University |
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Principal Investigator |
MAEDA Yonezo Kyushu Univ., Grad.School Sci., Professor, 理学研究院, 教授 (30037262)
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| Co-Investigator(Kenkyū-buntansha) |
HIDAKA Masanori Kyushu Univ., Grad.School Sci., Associate Professor, 大学院・理学研究院, 助教授 (50037298)
SUGIHARA Shinji Kyushu Univ., Grad.School Sci., Assistant Professor, 大学院・理学研究院, 助手 (10253402)
HAYAMI Shinya Kyushu Univ., Grad.School Sci., Assistant Professor, 大学院・理学研究院, 助手 (30321912)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Light Induced / Mossbauer Spectra / Spin-Crossover Complexes / Magnetic Properties / LIESST |
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| Research Abstract |
The purpose of this research is to make clear the mechanism of the spin-crossover and to synthesis the spin-crossover complexes with liquid crystal property, LIESST complexes and spin-crossover complexes driven by including guest molecules.
1.Complexes[Fe(pap)_2]ClO_4(1),[Fe(pap)_2]BF_4(2),[Fe(pap)_2]PF_6(3),[Fe(4Me-pap)_2]ClO_4(4),[Fe_<0.5>Al_<0.5>(pap)_2]ClO_4(5),and [Fe_<0.25>&Al_<0.75>(pap)_2]ClO_4(6)were prepared and their light induced magnetic properties were studied. Spin crossover properties and LIESST phenomenon was observed for complexes 1,2,3 and 6. The relationship of T_<LIESST>=-0.4T_<1/2>+185 between T_<1/2> and T_<LIESST> was observed. The parameter C=Γ/2RT_<1/2>(Γ : Parameter of intermolecular interaction) was defined and the relationship between cooperative phenomenon and spin-transition behavior was studied.
2.Fe(C16-3)_2(NCS)_2](7)[Fe(C16-terpy)_2](BF_4)_2(8)with liquid crystal properties were prepared for the first time in the world. Furthermore, complexes 7 and 8 showed LIESST phenomenon. The liquid crystal transition of 8 took place at the same temperature range as the spin-crossover transition took.
3.Complexes[Co(pyterpy)Cl_2>MeOH(9)and[Co(pyterpy)Cl_2]-2H_2O(10)were prepared. There are two H_2O molecules in me cavity of complex 10. Complex 9 is in high-spin state in the temperature range measured here and complex 10 undergoes abrupt spin-transition with hysteresis of 2K. The spin transition of the complex is dependent on guest molecules.
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