Dicarboxylate‐Induced Structural Diversity of Luminescent Zn(II)/Cd(II) Metal–Organic Frameworks Based on the 2, 5‐Bis(4‐pyridyl)thiazolo[5, 4‐d]thiazole Ligand. Issue 22 (31st May 2019) - Zhai, Zhi‐Wei
Abstract : Constructed from rigid 2, 5‐bis(4‐pyridyl)thiazolo[5, 4‐ d ]thiazole (Py2 TTz) and various dicarboxylic acids [2‐methyl‐1, 4‐benzenedicarboxylic acid (2‐CH3 ‐H2 BDC), 5‐methyl‐1, 3‐benzenedicarboxylic acid (5‐CH3 ‐H2 BDC), 2, 5‐dimethyl‐1, 4‐benzenedicarboxylic acid (2, 5‐di‐CH3 ‐H2 BDC), 2, 5‐dihydroxyl‐1, 4‐benzenedicarboxylic acid (2, 5‐di‐OH‐H2 BDC), 1, 4‐naphthalenedicarboxylic acid (1, 4‐H2 NDC), and 2, 6‐naphthalenedicarboxylic acid (2, 6‐H2 NDC)], nine novel Zn(II)/Cd(II) MOFs have been synthesized under solvothermal conditions. They possess diverse structures, which mainly result from the different shapes and sizes of the auxiliary dicarboxylate ligands. Linear dicarboxylate ligands (2‐CH3 ‐BDC, 2, 5‐di‐CH3 ‐BDC, 1, 4‐NDC, 2, 6‐NDC) generate 3D multi‐fold interpenetrated structures, while the V‐shaped dicarboxylate ligand (5‐CH3 ‐BDC) affords a 2D layer structure. However, linear 2, 5‐di‐OH‐BDC results in a 2D layer structure owing to the influence of the hydroxy group. Luminescence properties of compounds1 –9 have been investigated systematically. They display structure‐dependent emission ranging from blue to blue‐white and blue‐green. Abstract : Auxiliary dicarboxylate ligands confer structural diversity upon nine Zn(II)/Cd(II) MOFs based on 2, 5‐bis(4‐pyridyl)thiazolo[5, 4‐ d ]thiazole and further change their luminescence properties.