High-spin versus spin-crossover versus low-spin: geometry intervention in cooperativity in a 3D polymorphic iron(Ⅱ)-tetrazole MOFs system

摘要

Reported here are three 3D metal-organic framework (MOF) polymorphs with the chemical formula [Fe_2(H_(0.67)bdt)_3]·xH_2O (H_2bdt = 5,5'-(l,4-phenylene)bis(lH-tetrazole)), all of which are constructed from similar Fe~Ⅱ-tetrazole rod secondary building units (SBUs) via covalent links, but exhibit diverse spin states regulated by inter-chain cooperativity.