title: High-temperature spin crossover in two solvent-free coordination polymers with unusual high thermal stability.
abstract: Two solvent-free two-dimensional (2D) coordination polymers, (2)∞[Fe(ptim)2] (1) and (2)∞[Fe(ptpy)2] (2) (Hptim = 2-(5-(4-(1H-imidazol-1-yl)phenyl)-4H-1,2,4-triazol-3-yl)pyridine; Hptpy = 2-(5-(4-(pyridin-3-yl)phenyl)-4H-1,2,4-triazol-3-yl)pyridine), have been successfully prepared by solvothermal reactions. Their iron atoms are bridged by the corresponding multidentate anionic ligands into dense neutral structures. The magnetic data reveal that complexes 1 and 2 are rare examples exhibiting reversible one-step high-temperature spin crossover behaviors with spin transition temperatures of 419 and 416 K, respectively. Moreover, these structures also display remarkable thermal stability up to 714 K (for 1) and 690 K (for 2), which are confirmed by thermogravimetric and variable-temperature powder X-ray diffraction analyses.
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Bao
authors.forename: Jin-Yan
authors.initials: JY
authors.lastname: Li
authors.forename: Yu-Lian
authors.initials: YL
authors.lastname: Qin
authors.forename: Yan-Cong
authors.initials: YC
authors.lastname: Chen
authors.forename: Zhao-Ping
authors.initials: ZP
authors.lastname: Ni
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Tong