New mixed-anion 2-aminomethylpyridine (AMP) lead(II) complexes, Pb(AMP)_n(ClO₄)X, (X=CH₃COO⁻ and n=1 or X= and n=2); crystal and molecular structure of [Pb(AMP)₂](ClO₄)(NO₃)

Abstract

Lead(II) complexes with 2-aminomethylpyridine (AMP) containing two different anions, Pb(AMP) _n (ClO₄)X (X = CH₃COO⁻ and n = 1 or X = 

and n = 2), have been synthesized using a direct synthetic method and characterized by elemental analysis, IR, ¹H and ¹³C NMR spectroscopy. The structure of [Pb(AMP)₂](ClO₄)(NO₃) 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.

Keywords:

• Lead(II) complexes
• Crystal structure
• Mixed-anion complexes
• 2-Aminomethylpyridine ligand

Acknowledgements

Financial support for this investigation by Tarbiat Modarres University, Islamic Azad University of Zanjan, Iran and the Fonds der Chemischen Industrie is gratefully acknowledged.