Modulating the microporosity of cobalt phosphonates via positional isomerism of co-linkers
作者:Tao Zheng、Zhong-Sheng Cai、Wei-Xuan Nie、Min Ren、Song-Song Bao、Li-Min Zheng
DOI:10.1039/c5ce01087j
日期:——
cis-mode, and coordinates to the cobalt atoms from the same chain. Upon dehydration, compound 1 undergoes single-crystal-to-single-crystal (SC–SC) structural transformation forming a new crystal phase Co5(1,2-bix)2(pbtc)2(H2O)4 (1a). The process is reversible upon rehydration, showing a breathing effect. In compounds 2 and 3, similar layers composed of cobalt phosphonate chains and pbtc5− linkages are
通过引入共配体1,2-双(咪唑-1-基甲基)苯(1,2-bix),1,3-双(咪唑-1-基甲基)苯(1,3-bix)和1,4 -双(咪唑-1-基甲基)苯(1,4-bix),三种同分异构的膦酸钴Co 5(1,2-bix)2(pbtc)2(H 2 O)4 ·8H 2 O(1), Co 5(1,3-bix)2(pbtc)2(H 2 O)4 ·7.5H 2 O(2)和Co 5(1,4-bix)2(pbtc)2(H 2 O)4 ·6H 2 O(3)(pbtcH 5 = 5-膦酰基苯基-1,2,4-三羧酸)已成功分离。化合物1显示了层结构,其中包含交替排列的Co 3 O 2三聚体和Co 2二聚体的链通过pbtc 5-配体连接。1,2-bix共配体采用顺式,并与同一链上的钴原子配位。脱水后,化合物1经历单晶至单晶(SC-SC)结构转变,形成新的晶相Co 5(1,2-bix)2(pbtc)2(H 2 O)