Citation: Shuai Liang, Wen-Jing Jiang, Ji-Xiang Hu. Achieving colossal anisotropic thermal expansion via synergism of spin crossover and rhombus deformation[J]. Chinese Journal of Structural Chemistry, ;2025, 44(2): 100430. doi: 10.1016/j.cjsc.2024.100430 shu

Achieving colossal anisotropic thermal expansion via synergism of spin crossover and rhombus deformation

In summary, Liu et al. realized the thermally-induced spin transition with colossal PTE and NTE properties in a cyano-bridged hexanuclear complex. The spin transition as well as the conformational transformation triggered anisotropic alteration of the rhombic {FeIII2FeII2} unit and modifications in intermolecular C–H···π interactions, ultimately resulting in NTE along the b axis. This work demonstrates that merging SCO compounds with a pliable rhombic structure and intermolecular interactions leads to exceptional structural and thermodynamic characteristics. This approach represents a significant strategy in the realm of crystal engineering and thermo-responsive molecular devices.
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