Carboxylate-assisted acylamide metal–organic frameworks: synthesis, structure, thermostability and luminescence studies
作者:Gong-ming Sun、Hai-xiao Huang、Xiao-zhao Tian、Yu-mei Song、Yan Zhu、Zi-jun Yuan、Wen-yuan Xu、Ming-biao Luo、Shu-juan Liu、Xue-feng Feng、Feng Luo
DOI:10.1039/c2ce25602a
日期:——
We present a series of carboxylate-assisted ethylamide metalâorganic frameworks, namely, Zn2(L)2(oba)2·2H2O(1, L = N1,N3-di(pyridin-3-yl)isophthalamide, H2oba = 4,4â²-oxybis(benzoic acid)), Zn2(L)(nap)2·(DMF)2.5H2O(2, H2nap = 1,4-naphthalic acid, DMF = dimethylformamide), Cd(H2O)(L) (ip)·3H2O (3, H2ip = 1,3-benzenedicarboxylic acid), Cd(L)(ip)·2H2O(4). Polymer 1 crystallizes in the acentric Pca21 space group and presents an unprecedented topology prototype of noz-4-Pcca that allows three-fold interpenetration. Polymer 2 is a 3D supramolecular net with a considerable solvent-accessible void that is occupied by DMF and water molecules. As for polymers 3 and 4, the different formation of them is somewhat controlled by the concentration of initial materials such as 0.1 mmol Cd(NO3)2, L, ip in 8 mL water used for 3, 0.2 mmol Cd(NO3)2, L, ip in 8 mL water used for 4. In 3, a highly rare 1D porous ladder-type structure is observed, and further through hydrogen bonds a 2D supramolecular net is built. By contrast, a 3D α-Po net with two-fold interpenetration, based on a dinuclear Cd2(CO2)4 building block, is observed in 4. Moreover, their thermostability and luminescence properties are explored.
我们提出了一系列羧酸盐辅助乙基酰胺金属有机框架,即 Zn2(L)2(oba)2Â-2H2O(1,L = N1,N3-二(吡啶-3-基)间苯二甲酰胺,H2oba = 4,4â²-氧双(苯甲酸))、Zn2(L)(nap)2Â-(DMF)2.5H2O(2,H2nap = 1,4-萘二甲酸,DMF = 二甲基甲酰胺),Cd(H2O)(L) (ip)Â-3H2O(3,H2ip = 1,3-苯二甲酸),Cd(L)(ip)Â-2H2O(4)。聚合物 1 结晶于 Pca21 空间群的中心位置,并呈现出一种前所未有的拓扑结构,其原型为 noz-4-Pcca,可实现三倍互穿。聚合物 2 是一种三维超分子网,具有相当大的可溶解空隙,被 DMF 和水分子占据。至于聚合物 3 和 4,它们的不同形成在一定程度上受初始材料浓度的控制,如 3 使用 0.1 mmol Cd(NO3)2,L,ip 在 8 mL 水中,4 使用 0.2 mmol Cd(NO3)2,L,ip 在 8 mL 水中。在 3 中,观察到非常罕见的一维多孔阶梯型结构,并通过氢键进一步构建了二维超分子网。相比之下,在 4 中观察到了基于二核 Cd2(CO2)4 结构单元的具有两倍互穿性的三维 δ-Po 网。此外,还探讨了它们的热稳定性和发光特性。