Abstract
Two Pb(II) complexes with 8-quinolinol (8-Quin), 5-chloro thiophene-2-carboxylic acid, and (5-CTPC)/5-bromo thiophene-2-carboxylic acid (5-BTPC) have been synthesized and characterized by IR, 13C NMR, and solid state photoluminescence spectra. The structures of [Pb(8-Quin)4](5-CTPC)2 (1) and [Pb(8-Quin)2(8-Quio)](5-BTPC) (2) [(8-Quio) = 8-quinolinolate] have been confirmed by X-ray crystallography. Both complexes crystallize in the triclinic crystal system with a space group . In 1, Pb(II) is eight coordinate by four bidentate 8-quinolinol groups, while in 2 it is six coordinate by two bidentate 8-quinolinol groups and one bidentate 8-quinolinolate group. This leads to square antiprismatic and pentagonal pyramidal geometries around Pb(II) in 1 and 2, respectively. Two of the 5-CTPC ligands in 1 and a 5-BTPC in 2 are involved in strong O–H···O hydrogen bonding in the lattice. Cl···π interactions are found in 1. The crystal structures are stabilized by weak C–H···O and π–π stacking interactions.
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