Poly[bis(μ‐5‐iodoisophthalato)(methanol)dilead(II)] exhibiting a novel centrosymmetric rhombus‐shaped I4 unit
The asymmetric unit of the title compound, [Pb2(C8H3IO4)2(CH4O)] n , contains two PbII atoms, two 5‐iodoisophthalate (5‐IIP2−) ligands and one coordinated methanol molecule. One Pb atom is eight‐coordinated, surrounded by seven carboxylate O atoms from five 5‐IIP2− ligands and one O atom from the terminal methanol ligand. The other Pb atom is seven‐coordinated in a hemidirected geometry, surrounded by seven carboxylate O atoms from five 5‐IIP2− ligands. Both Pb atoms are connected by carboxylate groups to form a one‐dimensional infinite rod along the a axis; neighbouring rods are further linked by the aromatic rings of 5‐IIP2− to generate the final three‐dimensional structure with channels in the a direction. An O—H...O hydrogen bond between the methanol ligand and one of the carboxylate groups of a 5‐IIP2− ligand stablizes the three‐dimensional framework. Interestingly, a centrosymmetric rhombus‐shaped I4 unit is formed by four 5‐IIP2− ligands, with I...I distances of 3.8841 (8) and 3.9204 (8) Å.
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Document Type: Research Article
Affiliations: Department of Petrolchemical Engineering, Guangxi Vocational and Technical Institute of Industry, Nanning 530001, People's Republic of China
Publication date: May 15, 2013