title: Solid state and sonochemical syntheses of nano lead(II) chloride and bromide coordination polymers from its nitrate analog via mechanochemical crystal to crystal transformations.
abstract: Reversible crystal-to-crystal transformations of 3D lead(II) coordination polymers with the ligand 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene (4-bpdh), from nitrate analoge [Pb(4-bpdh)(NO3)2(H2O)]n (1) to [Pb(4-bpdh)(NO3)(Br)]n (2), [Pb(4-bpdh)(Br)2]n (3), [Pb(4-bpdh)(NO3)(Cl)]n (4) and [Pb(4-bpdh)(Cl)2]n (5) by solid state anion-replacement processes under mechanochemical reactions, have been studied. The reversible solid state structural transformations of compounds 1-5, by anion-replacement processes under mechanochemical reaction, have been verified by PXRD measurements. Nanoparticles of compounds were synthesized by sonochemical process and characterized by scanning electron microscopy (SEM), powder X-ray diffraction, IR spectroscopy and elemental analyses. The SEM images showed that morphology change occurs during solid state anion-replacements of nanocrystals.
authors.affiliation: Department of Chemistry, Faculty of Sciences, TarbiatModares University, P.O. Box 14115-175, Tehran, Islamic Republic of Iran.
authors.forename: Lida
authors.initials: L
authors.lastname: Hashemi
authors.affiliation: Department of Chemistry, Faculty of Sciences, TarbiatModares University, P.O. Box 14115-175, Tehran, Islamic Republic of Iran. Electronic address: morsali_a@modares.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Morsali
keywords: Anion-replacement; Coordination polymer; Nano-structure; Sonochemical