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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.
|Journal||European Journal of Inorganic Chemistry|
|Early online date||19 May 2016|
|Publication status||Published - Jul 2016|
- Cooperative effects
- Magnetic properties
- Metal-organic frameworks
- Spin crossover
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- 1 Finished
Understanding and Engineering Function in Switchable Molecular Crystals
Engineering and Physical Sciences Research Council
15/04/13 → 14/04/18
Project: Research council