1D Spin-Crossover Networks Containing a FeII(1,2,3-triazol-1-yl)4(CH3CN)2-Type Core



Bis(1,2,3-triazol-1-yl)methane (mbtr) was used to prepare 1D networks in which neighboring iron(II) ions are tethered by two semiflexible ligand molecules. [Fe(mbtr)2(CH3CN)2]X2·2CH3CN (X = BF4, ClO4) systems represent unique example of complexes that are based on monosubstituted 1,2,3-triazoles, in which four 1,2,3-triazole rings and two axially coordinated nitrile molecules form the first coordination sphere. Single-crystal X-ray diffraction and magnetic studies revealed that, in addition to homoleptic [Fe(1,2,3-triazol)6]-type core systems, complexes possessing the Fe(1,2,3-triazolyl)4(CH3CN)2-type core also exhibit thermally induced spin crossover.