Development of Coordination Polymer Spin Crossover Complexes with Optical Properties

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05485
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Toho University
• Principal Investigator: KITAZAWA Takafumi 東邦大学, 理学部, 教授 (60246767)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: スピンクロスオーバー / 磁気物性 / 高スピン / 低スピン / 光物性 / ホスト構造 / ゲスト分子 / 超分子構造

Outline of Final Research Achievements

We synthesized spin crossover complexes with insertedguest molecules; Fe[4-(3-pentyl)pyridine]2[Au(CN)2]2guest.The insertion of guest molecules enhances the chemical pressure in the two-dimensional Hofmann-type frameworks and promotes the SCO behavior depending on the size of guest molecules of
dichlorobenzene isomers. We found that the highest crossover temperature is achieved in the case of the shortest interlayer distance introducing the p-dichlorobenzene guest.We also have prepared the 2D spin crossover complexes
Fe(py)2Pd(CN)4 has been characterised by Mossbauer spectroscopic measurements, single crystal X-ray determination and SQUID measurements. The Mossbauer spectra indicate that the iron(II) spin states are in high spin states at 298 K and are in low spin states at 77 K.The delicate shifts might be associated with subtle balances between different vibrations around Fe(II) atoms and electronic factors. Five novel 3D cadmium(II) cyanide coordination polymers also were found.

Free Research Field

金属錯体化学