Three new Hg metal-organic polymers generated from 1,4-bis(n-pyridyl)-3,4-diaza-2,4-hexadiene ligands |
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Authors: | Ghodrat Mahmoudi |
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Institution: | Department of Chemistry, School of Sciences, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, Islamic Republic of Iran |
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Abstract: | Three new polymeric mercury(II) thiocyanate coordination polymers, {Hg2(L4)(SCN)4]n (1), Hg2(μ-L5)(μ-SCN)4]nHg2(μ-L5)(μ-SCN)4]2n (2) and Hg(L6)(SCN)2]n (3); L4 = 2,5-bis(2-pyridyl)-3,4-diaza-2,4-hexadiene, L5 = 2,5-bis(3-pyridyl)-3,4-diaza-2,4-hexadiene and L6 = 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) were prepared from reactions of mercury(II) thiocyanate with three organic nitrogen donor-based ligands under thermal gradient conditions using the branched tube method and fully characterized by infrared spectroscopy, elemental analysis, thermo gravimetric analysis, and single crystal X-ray diffraction. The compounds are structurally diverse and show very interesting structural motifs: the compound 1 is one-dimensional heterochiral double-chains. In compound 2, the bridging ligand L5 adopts a transoid conformation and the network contains two interpenetrating coordination polymers, a 2D net and a 1D double-chain. The crystal structure of 3 consists of one-dimensional zigzag chains. Solid-state luminescent spectra of the compounds 1 and 3 indicate intense fluorescent emissions at ca. 393 nm and 363 nm, respectively. |
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Keywords: | Mercury(II) 2 5-Bis(2-pyridyl)-3 4-diaza-2 4-hexadiene 2 5-Bis(3-pyridyl)-3 4-diaza-2 4-hexadiene 2 5-Bis(4-pyridyl)-3 4-diaza-2 4-hexadiene |
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