Simultaneous Spin-Crossover Transition and Conductivity Switching in a Dinuclear Iron(II) Coordination Compound Based on 7,7',8,8'-Tetracyano-p-quinodimethane
| Autor: | Motohiro Nakano, Zhao-Yang Li, Yoji Horii, Masahiro Yamashita, Shinya Hayami, Ryuta Ishikawa, Shohei Kumagai, Keiichi Katoh, Shunya Ueno, Shoei Nifuku, Hiroaki Iguchi, Yuji Miyazaki, Satoshi Kawata |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Magnetoresistance Magnetism 010405 organic chemistry Organic Chemistry Spin transition General Chemistry Conductivity 010402 general chemistry Magnetic susceptibility 01 natural sciences Catalysis Coordination complex 0104 chemical sciences Crystallography chemistry Electrical resistivity and conductivity Spin crossover |
| Zdroj: | Chemistry (Weinheim an der Bergstrasse, Germany). 26(6) |
| ISSN: | 1521-3765 |
| Popis: | The reaction of Fe(OAc)2 and Hbpypz with neutral TCNQ results in the formation of [Fe2 (bpypz)2 (TCNQ)2 ](TCNQ)2 (1), in which Hbpypz=3,5-bis(2-pyridyl)pyrazole and TCNQ=7,7',8,8'-tetracyano-p-quinodimethane. Crystal packing of 1 with uncoordinated TCNQ and π-π stacking of bpypz- ligands produces an extended two-dimensional supramolecular coordination assembly. Temperature dependence of the dc magnetic susceptibility and heat capacity measurements indicate that 1 undergoes an abrupt spin crossover (SCO) with thermal spin transition temperatures of 339 and 337 K for the heating and cooling modes, respectively, resulting in a thermal hysteresis of 2 K. Remarkably, the temperature dependence of dc electrical transport exhibits a transition that coincides with thermal SCO, demonstrating the thermally induced magnetic and electrical bistability of 1, strongly correlating magnetism with electrical conductivity. This outstanding feature leads to thermally induced simultaneous switching of magnetism and electrical conductivity and a magnetoresistance effect. |
| Databáze: | OpenAIRE |
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