title: Spin transitions in Fe(II) metallogrids modulated by substituents, counteranions, and solvents.
abstract: Two bis(tridentate) Schiff base ligands H2L(x) were used to construct three 2×2 grid-type tetranuclear Fe(II) complexes 1-3 to obtain polynuclear spin-crossover materials. Magnetic susceptibility measurements show that the spin states of the complexes are related to the substituents of H2L(x), and that spin transition occurs only in complexes 1 and 2, which are derived from a bulky ligand, whereas complex 3 is diamagnetic. The transition temperatures of complexes 1 and 2 are close to room temperature and are dependent on counteranions. The spin transition of complex 1 can be reversibly tuned by the dehydration and hydration process.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
authors.forename: Yi-Tong
authors.initials: YT
authors.lastname: Wang
authors.forename: Shu-Tao
authors.initials: ST
authors.lastname: Li
authors.forename: Shu-Qi
authors.initials: SQ
authors.lastname: Wu
authors.forename: Ai-Li
authors.initials: AL
authors.lastname: Cui
authors.forename: De-Zhong
authors.initials: DZ
authors.lastname: Shen
authors.forename: Hui-Zhong
authors.initials: HZ
authors.lastname: Kou