Synthesis, structure and photoluminescence of (HgCl3)n (C6NO2H6)n(C6NO2H5)n•nH2O

Abstract

A new isonicotinic acid compound with infinite mercury halide anionic chains, (HgCl₃)_n (C₆NO₂H₆)_n(C₆NO₂H₅)n•nH₂O (1), was obtained from the hydrothermal reaction and structurally characterized by X-ray single diffraction. The title compound is characteristic of a one-dimensional structure, based on one-dimensional (HgCl₃)^- anionic chains, protonated isonicotinic acid, neutral isonicotinic acid molecules and lattice water molecules. The protonated isonicotinic acid, neutral isonicotinic acid molecules and lattice water molecules are interconnected via hydrogen bonds to form a three-dimensional supramolecular framework. The (HgCl₃)^- anionic chains are anchored in the voids of the supramolecular framework via hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong emission in blue region. The emission band is identified as the π-π^* transitions of the isonicotinic acid moieties.

KEY WORDS: Crystal, Isonicotinic, Halide, Mercury, Photoluminescence

Bull. Chem. Soc. Ethiop. 2011, 25(2), 233-238.