On construction of lead coordination polymers derived from N′-(2-hydroxybenzylidene)nicotinohydrazide via covalent and non-covalent interactions

Abstract

Lead(II) and lead(IV) coordination polymers with N′-(2-hydroxybenzylidene)nicotinohydrazide have been synthesized from lead(II) salts, and subsequently characterized by solid-state UV‒Vis‒IR spectroscopy, thermal analysis, and powder and single-crystal X-ray diffraction techniques. The compounds crystallize in the same space group but differ in the oxidation state of lead, composition, conformation of the organic ligand, its charge, and tautomeric form. The coordination network is propagated by the hydrazone anion in the lead(II) metal-organic framework catena-[(μ₂-N-((2-oxidophenyl)methylidene)pyridine-3-carbohydrazonoato-N:N′,O,O′)-lead(II) (1) and by nitrate in a one-dimensional lead(IV) coordination polymer catena-(μ₂-nitrato-O,O)-(nitrato-O,O′)-(salicylaldehydeisonicotinoylhydrazonato-N,N′,O)-lead(IV) nitrate (2). The formation of metal-organic framework of 1 is affected by Pb···π interactions.

Graphical Abstract

Keywords:

• Lead(II), Lead(IV) coordination polymer
• Holodirected and homodirected
• Non-covalent interactions
• Pb···π interactions
• Metal-organic framework

Acknowledgments

This research was supported by the Institute of General and Ecological Chemistry, TUL (statutory sources), and the Faculty of Chemistry, Lodz University of Technology (Young Scientists’ Fund). The GAUSSIAN03 calculations were carried out in the Academic Computer Centre CYFRONET of the AGH University of Science and Technology in Cracow, Poland (grant number: MNiSW/SGI3700/PŁódzka/040/2008).