From a mononuclear FeL_(2)complex to a Fe_(4)L_(4)molecular square:Designed assembly and spin-crossover property  

作　　者：Zhuo Wang Li-Peng Zhou Li-Xuan Cai Chong-Bin Tian Qing-Fu Sun 

机构地区：[1]State Key Laboratory of Structural Chemisty,Fujian Institute of Rssearch on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2021年第2期398-403,共6页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21825107,21971237,21801241);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB20000000).

摘　　要：By introduction of a new Fe(L^(1))_(2)spin-crossover(SCO)unit into the polynuclear system,a nano-scale Fe4(L^(2))_(4)molecular square architecture is designed through coordination-directed self-assembly strategy.Both the mononuclear Fe(L^(1))_(2)and tetranuclear Fe4(L^(2))_(4)complexes have bee门structurally confirmed by 1H nuclear magnetic resonance(NMR),electrospray ionization time-of-flight mass spectrometry(ESI-TOF-MS),and temperature-dependent single crystal X-ray diffraction studies.Variable-temperature magnetic susceptibility measurements reveal the presence of an abrupt SCO behavior with a thermal hysteresis width of 4K for Fe(L^(1))_(2).By clear contrast,Fe4(L^(2))_(4)undergoes a gradual spin transition behavior with enlarged thermal hysteresis width and higher spin transition temperature.

关 键 词：spin-crossover compound molecular square iron coordination-directed self-assembly supram olecular chem istry 

分 类 号：O62[理学—有机化学]