Thermal and some other properties of 2,4′-bipyridyl complexes with various salts of lead(II)

New complexes of lead(II) with 2,4'-bipyridyl (L), with the general formulae PbL2X2 (where X-1=Cl, Br, I, NCS) and PbL3X2 (where X-1=NO3, ClO4), have been prepared. Analysis of the IR spectra indicates that the 2,4'-bipyridyl is bonded to the Pb(II) ion through the least hindering N(4'). The thermal decompositions of the complexes were studied under non-isothermal conditions in air. The intermediates of decomposition at different temperatures were characterized by thermal analysis (TG and DTG), chemical analysis and X-ray diffraction. Upon heating, the complexes undergo full or partial deamination. The complexes PbL2Cl2 and PbL2Br2 decompose to volatile lead(II) halide. PbO is the final product of decomposition for the other complexes.