The Chelating Behaviour of 3-(4-X-Phenyl)-2-sulfanylpropenoic Acids with the Pb-II Ion - Relevance of the Lone Electron Pair in the Supramolecular Structures of the 2:1 Complexes

作者：Casas Jose S; Victoria Castano M; Couce Maria D; Sanchez Agustin; Sordo Jose; Dolores Torres M; Vazquez Lopez Ezequiel M

来源：European Journal of Inorganic Chemistry, 2013, 2013(29): 5110-5120.

DOI：10.1002/ejic.201300633

• Lead
• Chelates
• Supramolecular chemistry
• Lone electron pairs

The interaction of 3-(4-X-phenyl)-2-sulfanylpropenoic acids [H-2(X-pspa); X = -F, -Cl, -Br, -I, -OCH3, -OCF3, -OH] with lead(II) acetate in an alcoholic medium was explored in the search for new chelating agents for the Pb2+ ion. The direct reactions afforded [Pb(X-pspa)] complexes in yields of 67 (X = -Br) to 95% (X = -OCH3). When the Pb-II/H-2(X-pspa) reaction was performed in the presence of diisopropylamine (Q), the derivatives [HQ](2)[Pb(X-pspa)(2)] (X = Cl, Br) were obtained. All of the complexes were characterized by spectrometric (FAB-MS and ESI-MS) and spectroscopic (IR, H-1 and C-13 NMR spectroscopy) methods and these showed the permanence of the O,S coordination of the ligands to the metal ion in dimethyl sulfoxide (DMSO) solution. H-2(Cl-pspa), [HQ](2)[Pb(Cl-pspa)(2)] and [HQ](2)[Pb(Br-pspa)(2)] were also fully characterized in the solid state by X-ray diffraction. The importance of the stereochemically active lone electron pair of the Pb-II ion in the supramolecular arrangement of [HQ](2)[Pb(X-pspa)(2)] (X = Cl, Br) is discussed.

• 出版日期2013-10-1