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

Shepherd, H.J. and Gural'Skiy, I.A. and Golub, Bohdan O. and Shylin, Sergii I. and Ksenofontov, Vadim and Raithby, Paul R. and Tremel, Wolfgang and 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:https://doi.org/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
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: 11 Nov 2016 13:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/55679 (The current URI for this page, for reference purposes)
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