Abstract
Solvothermal reaction of [1,1′-biphenyl]-3,3′,5,5′-tetracarboxylic acid (H4bptc), 3,5-diamine-1H-1,2,4-triazole (Hdatrz) and zinc acetate affords a three-dimensional structure of [Zn2(bptc)(datrz)](CH3)2NH2·2H2O (MAC-6). It is a (3,6)-connected framework built of paddle-wheel and triazolate-dinuclear metal clusters together with bptc ligands, and shows a novel (42.6)2(44.66.85) topology. Heating crystal samples of MAC-6 leads to the structure transformation to [Zn2(bptc)(datrz)(H2O)0.5](CH3)2NH2·H2O (MAC-6′), in which the paddle-wheel unit deforms to a dinuclear unit. Remarkably, MAC-6′ can reversibly recover to MAC-6 when the samples of MAC-6′ were immersed into DMF. The deformation and reformation of the paddle-wheel unit were studied by single-crystal-to-single-crystal (SCSC) transformation. In addition, their photoluminescent properties were also studied.
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