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Synthesis,structures, and spectroscopic properties of Hg(II) complexes of bidentate NN and tridentate NNO Schiff-base ligands
Abstract:Reactions of HgX2 (X?=?Cl, N3, NO3) with (E)-2-methoxy-N-(pyridin-2-ylmethylene)aniline (L1) and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline (L2) in ethanol gave two monomers, HgL1(Cl)2] (1) and HgL2(NO3)2(DMSO)] (5), and three coordination polymers, {HgL1(N3)2]2·Hg(N3)2}n (2), HgL2(Cl)2]n (3), and HgL2(NO3)2]n·nCH3CN (4). Compounds 1–5 were characterized by elemental analysis, IR, NMR spectroscopy, and single-crystal X-ray diffraction. The common feature of monomeric 1 and 5 is the presence of intra- and intermolecular Hg–O bonds. In the absence of these, polymeric structures arise as a result of azide, chloride, and nitrate bridging in 2, 3, and 4, respectively. Fluorescent properties of 1–5 were also investigated.
Keywords:Synthesis  Mercury(II) compounds  N  N-donor ligands  Photophysical properties  Crystal structures
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