Crystal structure and spectra of the mixed-ligands complex 1-(2-thenoyl)-2-[1′(2″-pyridyl)-ethylidene]hydrazino-acetato lead(II)

Abstract

Abstract The crystal structure of the title compound, (C14H13N3O3PbS)2, has been determined from three-dimensional X-ray diffraction data. The crystals are monoclinic, space group P21/c with a = 10.523(1) Å, b = 8.9922(4) Å, c = 16.6720(7) å, β = 104.142(4)° and Z = 2. The structure was solved by the heavy-atom method and refined by least-squares to a final R = 0.040 (Rw = 0.031) for 2393 observed unique reflections [F o > 5σ(F o)]. The lead atom is bonded to the 1-(2-thenoyl)-2-[1′(2″-pyridyl)ethylidenc]hydrazine ligand through the carbonyl oxygen, the pyridinyl nitrogen and the azomethinic nitrogen [Pb–O(thenoyl) 2.341(4) Å, Pb—N(azomethine) 2.410(6) Å, Pb—N (pyridine) 2.566(6) Å]. The lead atom is further chelated by the acetate ligand [Pb—O(2)2.290(6) Å, Pb—O(3)2.868(6) Å], while an additional weak interaction occurs between this atom and an acetate oxygen of another molecule [Pb—O(3)i 3.002(6) Å]. In this way dimer units are formed, the coordination geometry of the lead atom being that of a distorted pentagonal pyramid. The dimensions of the two organic ligands are as expected. The IR and electronic spectra are in accordance with the established structure from X-ray data. Conductivity measurements indicate the non-electrolytic character of the complex.