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Cooperative High-Temperature Spin Crossover Accompanied by a Highly Anisotropic Structural Distortion

Shepherd, H.J., Gural'Skiy, I.A., Golub, Bohdan O., Shylin, Sergii I., Ksenofontov, Vadim, Raithby, Paul R., Tremel, Wolfgang, Fritsky, Igor O. (2016) Cooperative High-Temperature Spin Crossover Accompanied by a Highly Anisotropic Structural Distortion. European Journal of Inorganic Chemistry, . pp. 1-5. ISSN 1434-1948. E-ISSN 1099-0682. (doi:10.1002/ejic.201600406) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

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.

Item Type: Article
DOI/Identification number: 10.1002/ejic.201600406
Uncontrolled keywords: Metal–organic frameworks; Spin crossover; Cooperative effects; Magnetic properties; Iron
Subjects: Q Science > QD Chemistry > QD156 Inorganic synthesis
Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Helena Shepherd
Date Deposited: 24 May 2016 10:25 UTC
Last Modified: 29 May 2019 17:24 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/55679 (The current URI for this page, for reference purposes)
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