title: Spin-crossover behavior in two new supramolecular isomers.
abstract: Two spin-crossover (SCO) supramolecular isomers formulated as [Fe(Mebpt){Au(CN)2}]n·xH2O (1, x = 0, and 2·H2O, x = n, MebptH = 3-(5-methyl-2-pyridyl)-5-(2-pyridyl)-1,2,4-triazole) have been successfully isolated and characterized by single-crystal X-ray crystallography, thermogravimetric analysis, differential scanning calorimetry, variable-temperature powder X-ray diffraction, and magnetic measurements. Structural analysis reveals that 1 is a two-dimensional coordination layer and 2·H2O is a one-dimensional coordination ladder structure, in which the Mebpt(-) ligands are coordinated in trans and cis bridging mode in 1 and 2·H2O, respectively. Dramatically, their SCO properties are further influenced by the octahedral coordination configuration of Fe(II). In 1, only the Fe(II) centers in trans configuration exhibit spin transition (Tc = 303 K), while in 2·H2O and the dehydrated 2, gradual two-step SCO (Tc1 = 235 K, Tc2 = 313 K) and one-step SCO behaviors (Tc = 315 K) occur, respectively.
authors.affiliation: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , 135 Xingang Road West, Guangzhou 510275, P. R. China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Yan
authors.forename: Zhao-Ping
authors.initials: ZP
authors.lastname: Ni
authors.forename: Fu-Sheng
authors.initials: FS
authors.lastname: Guo
authors.forename: Jin-Yan
authors.initials: JY
authors.lastname: Li
authors.forename: Yan-Chong
authors.initials: YC
authors.lastname: Chen
authors.forename: Jun-Liang
authors.initials: JL
authors.lastname: Liu
authors.forename: Wei-Quan
authors.initials: WQ
authors.lastname: Lin
authors.forename: Daniel
authors.initials: D
authors.lastname: Aravena
authors.forename: Eliseo
authors.initials: E
authors.lastname: Ruiz
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Tong