樟脑酸衍生物构筑的单一手性金属有机骨架化合物的合成、表征及荧光性质

设计合成了一个新的手性樟脑酸衍生物[D-H₂ctba, H₂ctba=4-(3-羧基-2,2,3-三甲基环戊烷酰胺)苯甲酸]. 将其作为配体与硝酸镉通过溶剂热反应得到了新的手性金属有机骨架化合物[Cd₃(ctba)₃·H₂O]_n(1). 通过单晶X射线衍射(XRD)、 粉末X射线衍射(PXRD)、 元素分析、 热重分析(TGA)和圆二色(CD)光谱对该化合物进行了表征. 单晶结构解析表明, 该化合物具有单一手性结构, 以1个六核的Cd羧基簇为基本单元, 簇与簇之间通过羧基相连形成(-Cd-O-C-)_∞棒状次级结构单元, 次级结构单元之间由配体相连, 拓展成为三维的骨架结构. 荧光光谱测试结果表明, 该化合物在室温下具有较强的荧光性质.

Synthesis, Characterization and Luminescence of a Chiral MOF Based on Camphor Derivative

A chiral camphor derivative, D-4-(3-carboxy-2,2,3-trimethylcyclopentanecarboxamido)benzoic acid (D-H2ctba) was designed and synthesized by simple organic reaction. Then, a self-assembly reaction occurred between D-H2 ctba and cadmium(Ⅱ) nitrate, [Cd3(ctba)3·H2O]n(1) was obtained and characte-rized by single-crystal X-ray diffraction(XRD), powder X-ray diffraction(PXRD), elemental analysis, thermogravimetric analysis(TGA) and circular dichroism(CD) measurement. Single-crystal structure analysis of compound 1 reveals that it crystallizes in the chiral orthorhombic space group P21212 and shows a 3D chiral structure. Compound 1 exhibits a kind of metal-carboxylate cluster which contents six octahedral Cd(II) centers and twelve carboxyl groups. Meanwhile the metal-carboxylate clusters are joined together by carboxyl to form infinite(—Cd—O—C—)∞ rods, and these rods consist the rod-shaped secondary building units(SBUs). The rod-shaped SBUs are stacked in parallel and connected by the ctba ligand to give 3D framework. Additionally, the luminescent spectrum of compound 1 shows a strong fluorescence at room temperature.