Structural investigation of lead(II) fluorine-substituted β-diketonates

Lead(II) 2,9-dimethyl-1, 10-phenanthroline complexes with anionic (L=4,4,4-trifluorol-phenyl-1,3-butandionate (tfpb) and thenoyltrifluoroacetonate (ttfa)) ligands, [Pb-2(dmP)2 (mu-L)(2)(L)(2)], have been synthesized and characterized by elemental analysis and IR, H-1 NMR, and C-13 NMR spectroscopy. The single-crystal structures of the compounds show the coordination number of Pb(II) to be eight with two N-donor atoms from a dmp ligand and six O-donors from the anionic ligands. Self-assembly of these complexes is realized by C-H center dot center dot center dot F-C, C-F center dot center dot center dot F-C and pi-pi stacking interactions.