Synthesis, structure, luminescence and catalytic properties of cadmium(ii) coordination polymers with 9H-carbazole-2,7-dicarboxylic acid
作者:Xiu-Chun Yi、Meng-Xuan Huang、Yan Qi、En-Qing Gao
DOI:10.1039/c3dt53109k
日期:——
Two Cd(II) metal–organic frameworks were synthesized from the NH-functionalized dicarboxylate ligand 9H-carbazole-2,7-dicarboxylic acid (2,7-H2CDC). Compound 1, [Cd4(CDC)4(DMF)4]·4DMF·4H2O, displays 2D square grid networks based on novel tetranuclear [Cd4(COO)8] secondary building units (SBUs) and pairwise CDC2− linkers. Compound 2, (H3O)2[Cd3(2,7-CDC)4]·3DMF·4H2O, is also based on 4-connected SBUs and pairwise CDC linkers, but the unusual trinuclear [Cd3(COO)8] SBUs lead to 2-fold interpenetrated 3D diamond-type frameworks with guest accessible voids. Both compounds display strong blue fluorescence in the solid state, and compound 2 shows high catalytic activity for Knoevenagel condensation.
研究人员利用 NH 功能化的二羧酸配体 9H-咔唑-2,7-二羧酸(2,7-H2CDC)合成了两种镉(II)金属有机框架。化合物 1 [Cd4(CDC)4(DMF)4]-4DMF-4H2O,基于新型四核[Cd4(COO)8]二级构建单元(SBU)和成对的 CDC2- 连接器,显示出二维方格网。化合物 2((H3O)2[Cd3(2,7-CDC)4]-3DMF-4H2O)也是基于 4 连接的 SBU 和成对的 CDC 连接器,但不寻常的三核 [Cd3(COO)8] SBU 形成了具有客体可进入空隙的 2 倍互穿的三维金刚石型框架。这两种化合物在固态下都显示出强烈的蓝色荧光,化合物 2 对克诺文纳格尔缩合具有很高的催化活性。