Two new Pb(II) coordination polymers derived from fatty dicarboxylates and phenanthroline derivatives: syntheses, structures, and properties

摘要

Two new Pb(II) coordination polymers, [Pb(3-pdip)(L₁)] · 0.5H₂O (1) and [Pb(4-pdip)(L₂)] (2) [L₁ = heptane diacid, L₂ = hexane diacid, 3-pdip = 2 -(3-pyridyl)imidazo[4,5-f]1,10-phenanthroline, 4-pdip = 2 -(4-pyridyl)imidazo[4,5-f]1,10-phenanthroline], have been obtained from hydrothermal reactions of Pb(II) nitrate with two flexible fatty carboxylic acids and two phenanthroline derivatives. Single-crystal X-ray diffraction analysis reveals that 1 is a 1-D staircase-like double chain coordination polymer extended by binuclear [Pb₂N₄O₈] subunits and pairs of L₁ ligands. Compound 2 exhibits a 2-D (4,4) network based on bi-metallic [Pb₂N₆O₈] units and (L₂)₂/(4-pdip)₂ double linkers. Furthermore, adjacent chains of 1 and layers of 2 are extended into 3-D supramolecular networks by π-π stacking interactions between aromatic rings of phenanthroline groups. The organic carboxylic acids with different lengths show great influence on the shapes of Pb(II)-carboxylate double chains. Phenanthroline derivatives possessing different sites of N-donors (3-pyridyl and 4-pyridyl) determine the final coordination frameworks of 1 and 2. Photoluminescence and thermal stabilities of 1 and 2 were also investigated.View full textDownload full textKeywordsHydrothermal syntheses, Crystal structures, Lead coordination polymers, Photoluminescent propertyRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00958972.2012.697158