Guest Removal and External Pressure Variation Induce Spin Crossover in Halogen-Functionalized 2-D Hofmann Frameworks
作者:Ashley T. Brennan、Katrina A. Zenere、Helen E. A. Brand、Jason R. Price、Mohan M. Bhadbhade、Gemma F. Turner、Stephen A. Moggach、Francisco J. Valverde-Muñoz、Jose A. Real、Jack K. Clegg、Cameron J. Kepert、Suzanne M. Neville
DOI:10.1021/acs.inorgchem.0c02092
日期:2020.10.5
The effect of halogen functionalization on the spin crossover (SCO) properties of a family of 2-D Hofmann framework materials, [FeIIPd(CN)4(thioX)2]·2H2O (X = Cl and Br; thioCl = (E)-1-(5-chlorothiophen-2-yl)-N-(4H-1,2,4-triazol-4-yl)methanimine) and thioBr = (E)-1-(5-bromothiophen-2-yl)-N-(4H-1,2,4-triazol-4-yl)methanimine)), is reported. Inclusion of both the chloro- and bromo-functionalized ligands
卤素官能化对2维霍夫曼骨架材料[Fe II Pd(CN)4(thioX)2 ]·2H 2 O(X = Cl和Br; thioCl = (E)-1-(5-氯噻吩-2-基)-N-(4 H -1,2,4-三唑-4-基)甲亚胺)和硫代溴=(E)-1-(5-溴噻吩-据报道2-(基)-N-(4 H -1,2,4-三唑-4-基)甲亚胺))。将氯和溴官能化的配体都包括在霍夫曼型骨架中(1 Cl ·2H 2 O和2 Br ·2H2 O)由于内部化学压力效应而阻止了自旋态跃迁,而内部化学压力效应是由卤原子和客体分子的总体空间体积产生的。通过去除客人或施加外部物理压力可以揭示合作的一步式SCO过渡。值得注意的是,去除溶剂水会显示出坚固的骨架支架,而在溶剂化和去溶剂化的结构之间只有很小的变化(通过粉末和单晶X射线衍射研究)。然而,在1 Cl和2 Br中揭示了一步完整的SCO过渡由于各种空间,结构和电子方面的考虑,