Spin-crossover in iron(ii) coordination compounds with 2,6-bis(benzimidazol-2-yl)pyridine†
Abstract
New iron(II) complexes with 2,6-bis(benzimidazol-2-yl)pyridine (L), in particular, [FeL2]A2·nH2O (A = Br− (I), NO3− (II), C2N3− (III); n = 1 (I), 0.5 (II), 2 (III)) and [NiL2]Br2·1.23H2O·3.33EtOH (IV), have been synthesized and studied using single-crystal and powder X-ray diffraction techniques, UV-vis (diffuse reflection), IR and Mössbauer spectroscopy, as well as static magnetic susceptibility measurements. According to the experimental μeff(T) curves all the studied iron(II) compounds exhibit 1A1 ↔ 5T2 spin-crossover.