Effect of two sonochemical procedures on achieving to different morphologies of lead(II) coordination polymer nano-structures

Micro and nano-structures of a lead(II) coordination polymer, [Pb-2(2-Me-8-Hq)(2)(MeOH)(2)](n) (1), [2-Me-8-HqH = 2-methyl-8-hydroxyquinoline], were synthesized by two sonochemical methods. These new micro and nano-structures were characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analyses. Compound 1 was structurally characterized by single-crystal Xray diffraction and consists of primary dimeric unit of [Pb-2(2-Me-8-Hq)(2)(MeOH)(2)]. Self assembly between the dimmeric units of [Pb-2(2-Me-8-Hq)(2)(MeOH)(2)] from Pb-O bonds results in formation of a one-dimensional lead(II) coordination polymer. The Pb-II-ion in compound 1 has PbO6N1 coordination sphere with a stereo-chemically 'active' electron lone pair on the metals. By a reversible solid-state structural transformation, we successfully prepared [Pb-2(2-Me-8-Hq)(2)](n) (2) by thermal desolvation of 1. Thermal stability of compound 1 was studied by thermo gravimetric and differential thermal analyses. In addition nano-structure of PbO was prepared from calcination process of compound I at 873 K. (C) 2013 Elsevier B.V. All rights reserved.