Publications in Scientific Journals:
M. Sharif, H. Aghabozorg, A. Shokrollahi, G. Kickelbick, A. Moghimi, M. Shamsipur:
"Novel Proton Transfer Compounds Containing 2,6-Pyridinedicarboxylic Acid and Melamine and Their PbII Complex: Synthesis, Characterization, Crystal Structure and Solution Studies";
Polish Journal of Chemistry,
80
(2006),
847
- 863.
English abstract:
Two novel proton transfer compounds LH2, (tataH2)(pydc), and L'H2, (tataH)2(pydc), (pydcH2 = 2,6-pyridinedicarboxylic acid and tata = melamine, 2,4,6- triamino-1,3,5-triazine), were synthesized and characterized by IR, 1H and 13C NMR spectroscopy and solid state CPMAS 13C NMR. The (tataH2)2[Pb(pydc)2]2×2tata×4H2O complex (1) was prepared using L'H2 and lead(II) nitrate, and characterized by IR and NMR spectroscopy and single crystal X-ray analysis. The PbII complex is a binuclear anionic complex [Pb(pydc)2]24-, in which two metal fragments are linked via a central ten-membered PbN(13)C(18)C(22)O(24)Pb(A)N(13A)C(18A)C(22A)O(24A) ring. Extensive hydrogenbond ing between carboxylate groups, (tataH2)2+ and watermolecules through out the PbII complex together with ionpairing play important roles in stabiliing the corresponding lattice. The protonation constants of the reactants, the equilibrium constants for the reaction of pydc with tata and the stoichiometry and stability of the PbII complex with L'H2 in aqueous solution were in vestigated by potentiometric pH titrations. The stoichiometry of one of the most abundant complexed species in solution was found to be the same as that of the crystalline lead complex.
Keywords:
lead, dipicolinic acid, melamine, X-ray crystal structure, hydrogen bonds, ion pairs, solution studies
Created from the Publication Database of the Vienna University of Technology.