Cooperative High-Temperature Spin Crossover Accompanied by a Highly Anisotropic Structural Distortion
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- 作者：Il'ya A. Gural'skiy ; Bohdan O. Golub ; Sergii I. Shylin ; Vadim Ksenofontov ; Helena J. Shepherd ; Paul R. Raithby ; Wolfgang Tremel and Igor O. Fritsky
- 刊名：European Journal of Inorganic Chemistry
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：2016
- 期：19
- 页码：3191-3195
- 全文大小：690K
- ISSN：1099-0682c
文摘
Spin transitions are a spectacular example of molecular switching that can provoke extreme electronic and structural reorganizations in coordination compounds. A new 3D cyanoheterometallic framework, [Fe(pz){Au(CN)2}2], has been synthesized in which a highly cooperative spin crossover has been observed at 367 and 349 K in heating and cooling modes, respectively. Mössbauer spectroscopy revealed a complete transition between the diamagnetic and paramagnetic states of the iron centres. The low-spin-to-high-spin transition induced a drastic structural distortion involving a large one-directional expansion (ca. 10.6 %) and contraction (ca. 9.6 %) of the lattice. Negative thermal expansion along the c axis was detected below and above the transition temperature.