Acentric and chiral four-connected metal–organic frameworks based on the racemic binaphthol-like chiral ligand of 4-(1-H(or methyl)-imidaozol-1-yl)benzoic acid
作者:Ke-Hui Cui、Shi-Yan Yao、Hai-Qin Li、Yan-Tao Li、Hai-Ping Zhao、Chun-Jie Jiang、Yun-Qi Tian
DOI:10.1039/c0ce00789g
日期:——
By modulating the synthetic strategy based on changing substituents on the ligand and solvent used in the synthesis, a series of metal organic frameworks (MOFs) of two chiral binaphthol-like ligands of 4-(1H-imidaozol-1-yl)benzoic acid (HIBA) and 4-(1H-2-methylimidazol-1-yl)benzoic acid (HMIBA) with various interpenetrating topologies have been synthesized under solvothermal conditions: Zn(IBA)2 (1), Co(IBA)2 (2), Cd(IBA)2·H2O·1.7DMF (3), Cd(MIBA)2·H2O·1.3DMF (4), Co(MIBA)2·H2O·1.3DMF (5) and Cd(MIBA)2·0.5H2O·1.2DMA (6) (DMF = N,N-dimethylformamide and DMA = N,Nâ²-dimethylacetamide). X-ray diffraction study reveals that compounds 1 and 2 crystallize in tetragonal crystal system with chiral space groupsP4122 and P4322, respectively, indicating that they are a pair of structural enantiomers, having a twofold interpenetrating (4,4)-net. Compound 3 crystallizes in orthorhombic crystal system and non-centrosymmetric space group Pca21, which can be defined as an abnormal fourfold [2 + 2] interpenetrating diamond net. The isostructural compounds 4 and 5 crystallize in tetragonal crystal system and space group P4212, representing a chiral structure and a normal mode of fourfold interpenetrating diamondoid net. Compound 6 crystallizes in non-centrosymmetric space group Aba2 and exhibits a normal mode of fourfold diamondoid interpenetrating net.
通过改变配体上的取代基和溶剂的合成策略,在溶热条件下合成了一系列具有不同互穿拓扑结构的4-(1H-咪唑-1-基)苯甲酸(HIBA)和4-(1H-2-甲基咪唑-1-基)苯甲酸(HMIBA)两种手性二萘酚类配体的金属有机框架(MOFs):Zn(IBA)2 (1)、Co(IBA)2 (2)、Cd(IBA)2-H2O-1.7DMF (3)、Cd(MIBA)2-H2O-1.3MF (4)、Co(MIBA)2-H2O-1.3DMF(5)和 Cd(MIBA)2Â-0.5H2OÂ-1.2DMA (6)(DMF=N,N-二甲基甲酰胺,DMA=N,N²-二甲基乙酰胺)。X 射线衍射研究显示,化合物 1 和 2 结晶为四方晶系,手性空间群分别为 P4122 和 P4322,表明它们是一对结构对映体,具有两重互穿 (4,4)- 网。化合物 3 在正交晶系和非中心对称空间群 Pca21 中结晶,可定义为异常的四倍[2 + 2]互穿菱形网。等结构化合物 4 和 5 结晶为四方晶系,空间群为 P4212,代表手性结构和正常模式的四倍互穿金刚网。化合物 6 在非中心对称空间群 Aba2 中结晶,表现出四倍金刚石互穿网的正常模式。