Pb•••N interactions and π-stacking in lead(II) bis(hydrazone) compounds

2,6-Diacetylpyridine-bis(benzoylhydrazone), H2LPh, reacts with Pb(OAc)(2)center dot 3H(2)O and NEt3 as a supporting base forming a polymeric solid of the composition [Pb(L-Ph)](n). A reaction with pyridine results in cleavage of the polymer and formation of the dimeric, crystalline compound [Pb(py)(L-Ph)](2). Similar reactions with PbX2 salts (X = Cl, Br, I) also give almost insoluble solids of the tentative composition [Pb(H2LPh)X-2](n). After ongoing reactions with DMSO, single deprotonation of the organic ligand and the formation of pseudo-dimeric [Pb(HLPh)X](2) complexes was observed. Depending on the presence of solvent molecules they form different supramolecular aggregates by pi-pi interactions. The use of Pb(NO3)(2) results in a dimeric structure with relatively short Pb-O bonds of 2.442(2) angstrom between the monomeric sub-units. The formed dimers aggregate to a polymeric assembly by hydrogen bonds. The products were studied by spectroscopic methods and X-ray diffraction. (C) 2016 Elsevier Ltd. All rights reserved.