3D zinc(II) coordination polymers built up by triazole and benzene-polycarboxylate anions: Synthesis,crystal structure,thermal and photoluminescence characterization |
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| Authors: | Durga Sankar Chowdhuri Abhinandan Rana Madhusudan Bera Ennio Zangrando Sudipta Dalai |
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| Institution: | 1. Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, 721 102 WB, India;2. Dipartimento di Scienze Chimiche, University of Trieste, 34127 Trieste, Italy |
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| Abstract: | Two coordination polymers of the formula Zn5(tmaH)4(trz)2(H2O)4] (1) and Zn3(bta)(trz)2(H2O)4]·2H2O (2) tmaH3 = benzene-1,3,5-tricarboxylic acid/trimesic acid, trzH = 1,2,4-triazole, btaH4 = benzene-1,2,4,5-tetracarboxylic acid] have been synthesized and structurally characterized by X-ray single crystal diffraction analysis. Both complexes are 3D coordination polymers containing Zn4(trz)2] units connected by benzene-carboxylate anions. In particular, an undulated layer containing 6- and 18-membered rings is outlined in the network of 1. Hydrogen bonds, involving the coordinated and lattice water molecules with carboxylate oxygen atoms, contribute to the stabilization of the networks. Their thermal stability was investigated by thermogravimetric analysis. The fluorescence spectrum of 1 features two peaks at 419 and 323 nm, originating from a π–π∗ intraligand transition and LMCT, respectively. For 2 a broad band at 410 nm is assigned solely as a π–π∗ intraligand transition. |
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| Keywords: | Coordination polymer of zinc(II) 1 2 4-Triazole Trimesic acid Benzene-1 2 4 5-tetracarboxylic acid Photoluminescence |
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