6533b853fe1ef96bd12ad692
RESEARCH PRODUCT
Cooperative High-Temperature Spin Crossover Accompanied by a Highly Anisotropic Structural Distortion
Paul R. RaithbyBohdan O. GolubHelena J. ShepherdWolfgang TremelIl'ya A. Gural'skiyIgor O. FritskyVadim KsenofontovSergii I. Shylinsubject
chemistry.chemical_classificationCondensed matter physicsCooperative effects010405 organic chemistryChemistryTransition temperatureIronMetal-organic frameworks010402 general chemistrySpin crossover01 natural sciences0104 chemical sciencesCoordination complexInorganic ChemistryParamagnetismNuclear magnetic resonanceNegative thermal expansionSpin crossoverQD156Mössbauer spectroscopyMagnetic propertiesQD473DiamagnetismAnisotropydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-19 |