New mixed-anion 2-aminomethylpyridine (AMP) lead(II) complexes, Pb(AMP)_n(ClO_4)X, (X = CH_3COO~- and n = 1 or X = NO_3~- and n = 2); crystal and molecular structure of [Pb(AMP)_2](ClO_4)(NO_3)

摘要

Lead(II) complexes with 2-aminomethylpyridine (AMP) containing two different anions, Pb(AMP)_n(ClO_4)X (X = CH_3COO~- and n = 1 or X = NO_3~- and n = 2), have been synthesized using a direct synthetic method and characterized by elemental analysis, IR, ~1H and ~(13)C NMR spectroscopy. The structure of [Pb(AMP)_2](ClO_4)(NO_3) was confirmed by X-ray crystallography; single-crystal X-ray data show the complex to be monomeric. The Pb atom has an unsymmetrical four-coordinate geometry, being coordinated by four nitrogen atoms of the two "AMP" ligands. The arrangement of the "AMP" ligands exhibits a coordination gap around the Pb(II) ion, possibly occupied by a stereoactive lone pair of electrons on lead(II), and the coordination around the lead atoms is hemidirected.