Mercury(II) acetate/thiocyanate coordination polymers with n-donor ligands, spectroscopic, thermal and structural studies

摘要

Three new mercury(II) coordination polymers, [Hg-2(mu-bpa)(mu-SCN)(2)(mu-CH3COO)(2)](n) (1), [Hg-2(mu-4-bpdb)(1.5)-(mu-CH3COO)(mu(1),(1)-SCN)(mu(1,3)-SCN)(SCN)](n) center dot CH3CN (2) and [Hg(mu-3-bpdb)(CH3COO)(2)](n) (3) {(bpa = 1,2-bis(4-pyridyl) ethane, 4-bpdb) = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene and 3-bpdb = 1,4-bis(3-pyridyl)-2,3- diaza-1,3-butadiene, have been synthesized and characterized by CHN elemental analysis and IR spectroscopy. The single crystal X-ray data show the compound 1 is two-dimensional coordination polymer as a result of simultaneously bridging 1,2-bis(4-pyridyl) ethane, acetate and thiocyanate ligands. The single-crystal X-ray data of the compound 2 show that the complex to be a two-dimensional polymer, one of Hg atoms has four-coordinate and one of them has seven-coordinate. Three SCN anions show three different coordination modes with terminal, mu(1,1)-bridge and mu(1,3)-bridge fashions. The structural studies of compound 3 show the structure may be considered a one-dimensional coordination polymer of mercury(II) consisting of linear chains formed by a bridging 3-bpdb ligand. The thermal stabilities of these compounds were studied by thermal gravimetric (TG) and differential thermal analyses (DTA).