Synthesis of Lead(II) Minoxidil Coordination Polymer: A New Precursor for Lead(II) Oxide and Lead(II) Hydroxyl Bromide |
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Authors: | Maryam Ranjbar ?mer ?elik S. Heydar Mahmoudi Najafi Shabnam Sheshmani Neda Akbari Mobarakeh |
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Affiliation: | 1. Department of Chemical Technologies, Iranian Research Organization for Science and Technology, P.O. Box 15815-3538, Tehran, Iran 2. Department of Physics, Faculty of Education, Dicle University, Diyarbakr, Turkey 3. Department of Chemistry, Islamic Azad University, Shahr-e Rey Branch, Tehran, Iran
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Abstract: | A new lead(II) coordination polymer, [PbBr2(C9H15N5O)]n (1), where C9H15N5O is (2,4-diamino-6-piperidine-1-yl) pyrimidine N-oxide (minoxidil) is synthesized and characterized. Polymer 1 is synthesized in methanol by sonochemical and hydrothermal methods from lead(II) acetate, KBr and the minoxidil ligand. The crystal structure of [PbBr2(C9H15N5O)]n indicates a syndiotactic coordination polymer. The Pb(II) atom lies on a mirror plane; the mirror plane is perpendicular to the pyrimidine ring bisecting the piperidine ring. N–H···O intramolecular and C–H···Br, N–H···N strong intermolecular interactions were observed. Micro-rods of PbO and nano-plates of PbOHBr were prepared by thermal decomposition of the nano-structured [PbBr2(C9H15N5O)]n as a precursor. Characterization of the products was carried out using X-ray crystallography, elemental analysis, FTIR spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis and thermal analysis. The sonochemical method resulted in a significant reduction of reaction time, reaction temperature and particle sizes of the products. |
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