On the verification of binding modes of p-dimethylaminobenzaldehyde thiosemicarbazone with mercury(II). The solid state studies

• Published in: Journal of molecular structure 2014-08, Vol.1072, p.284-290
• Main Author: Trzesowska-Kruszynska, Agata
• Format: Article
• Language: English
• Subjects: Binding; Chlorides; Coordination compounds; Ligands; Mercury; Mercury (metal); Metalloaromaticity; Molecular structure; Nitrates; Non-covalent interactions; Stacking; Thiosemicarbazone
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2014.05.027

•Two compounds of thiosemicarbazone, fluorescent chemosensor, with Hg ion were characterised.•Inorganic anion influences the binding mode of thiosemicarbazone ligand to Hg ion in solid state.•The crystal packing is controlled by Hg chelate ring–phenylene ring π···π stacking interactions. Two coordination compounds of p-dimethylaminobenzaldehyde thiosemicarbazone, fluorescent chemosensor, have been synthesised from the mercury(II) nitrate and mercury(II) chloride, and subsequently characterised by IR spectroscopy, thermal analysis, as well as single crystal X-ray diffraction technique. The inorganic anion has a distinct influence on binding mode of thiosemicarbazone ligand to Hg(II) ion. In both compounds the metal to ligand stoichiometry is 1:2 and the organic ligands coordinate to Hg ion in the neutral thione form, but they differ in a ligand binding mode and the conformation of the ligand. The crystal packing of mercury(II) nitrate complex with thiosemicarbazone is controlled by the mercury chelate ring–phenylene ring π···π stacking interactions.