Hg(μ-4,4′-bipy)(μ-AcO)(AcO)] n · n/2H 2O, one-dimensional double-chain coordination polymer, syntheses, characterization, thermal, fluorescence, porous and structural studies

Abstract

A new Hg II coordination polymer with 4,4′-bipyridine and acetate anions, [Hg(μ-4,4′-bipy)(μ-AcO)(AcO)] n · n/2H 2O ( 1), has been synthesized, characterized by elemental analysis, IR-, 1H NMR-, 13C NMR spectroscopy and its structure determined by single-crystal X-ray diffraction. The thermal stability of compound 1 was studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The structural studies of compound 1 show that the structure may be considered as a coordination polymer of mercury(II) consisting of linear double chains formed by a bridging 4,4′-bipy ligand and by connecting acetate-bridged centrosymmetric {Hg 2(OAc) 2} 2+ nodes. Solid-state luminescent spectra of the ligand 4,4′-bipyridine and compound 1 indicate a fluorescent broad emission band with the maximum intensity at ca 468.2 and 446.4 nm upon excitation at 295 nm, respectively. The stability of porous network after removal of guest water molecules is not confirmed by X-ray powder diffraction.