Synthesis and vibrational spectra of some lead(II) halide adducts with O-, S-, and N-donor atom ligands

Abstract

Lead(II) halides (PbX 2 where X = Cl, Br, and I) formed five types of adducts with monodentate (L) and bidentate (LL) ligands: PbX 2 •L, PbX 2 •2L, 2PbX 2 •L, PbX 2 •LL, and PbX 2 •2LL, but not all halides and ligands produced each type. Monodentate ligands were dimethylsulphoxide, N,N-dimethylacetamide, N,N-dimethylthioacetamide, thioacetamide, 2,6-dimethyl-γ-pyrone, N-methyl-2-pyridone, N-methyl-2-pyrollidinone, thiourea, pyridine, piperidine, and aniline, while bidentate ligands were ethylenediamine, tetramethylethylenediamine, 1,10-phenanthroline, and 2,2′-bipyridine. Infrared and Raman spectra are reported together with ligand vibrational frequencies shifted by coordination. Under similar experimental conditions qualitative trends in acceptor and donor abilities appeared to be PbI 2 > PbBr 2 > PbCl 2 and S-donors > O-donors, respectively.