Synthesis, thermal analysis and crystal structure of lead(II) diaqua 3,6-dicarboxylatopyridazine. Evaluation of performance as a synthetic precursor

Pb(H2O)(2)DCP (DCP = 3,6-dicarboxylatopyridazine) has been synthesized and characterized by thermal gravimetric analysis and single crystal X-ray dffr action: tetragonal, space group I4(1)/a, a = b = 15.278(2), c = 15.218(3) A ngstrom, U = 3552.3(1) Angstrom(3), Z = 16. The structure consists of colum ns of lead atoms linked by tetradentate DCP molecules in a spiral array. Th e irregular 8-fold coordination sphere of Pb-II consists of two bidentate D CP molecules, the oxygen atoms of two neighboring ligands and two coordinat ed water molecules. The thermal decomposition of this complex to yield PbO at low temperatures was observed by powder diffraction and by thermal gravi metric analysis. Comparison of Pb(H2O)(2)(DCP) and Pb(H2O)(2)(oxalate) as p recursors in the synthesis of the mixed metal oxide, Bi12PbO19, showed the use of Pb(H2O)(2)(DCP) to result in mixed metal oxide product with a smalle r grain size.