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The crystal structure of the title compound, (C 14 H 13 N 3 O 3 PbS) 2 , has been determined from three-dimensional X-ray diffraction data. The crystals are monoclinic, space group  P 2 1 / 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 ( R w   = 0.031) for 2393 observed unique reflections [ F  o  &gt; 5 σ ( 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.

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