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Two Cd(ii) metal-organic frameworks were synthesized from the NH-functionalized dicarboxylate ligand 9H-carbazole-2,7-dicarboxylic acid (2,7-H2CDC). Compound , 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 CDC(2-) linkers. Compound , (H3O)2Cd3(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 shows high catalytic activity for Knoevenagel condensation.
Yi et al. (Mon,) studied this question.
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