6056-52-6

The hydrothermal reaction of lead(II) carbonate with 3-sulfobenzoic acid, 3-HO3S-C6H4-CO2H, and isopropylimino-bis(methylenephosphonic acid), (CH3) 2CHN(CH2PO3H2)2 (H 4L1), gave a new layered lead(II) carboxylate-phosphonate, Pb7(S-O3S-C6H4-CO 2)(L1)3(H2O)2· 2H2O (1), whereas the hydrothermal reaction of lead(II) carbonate with 1, 3,5-benzenetricarboxylic acid (H3BTC) and N-cyclohexyUmino-bis(methylenephosphonic acid), C6H 11N(CH2PO3H2)2 (H 4L2), afforded a layered complex, Pb3(HL 2)(H2L2)(H2BTC)-(H 2O)·H3BTC·H2O (2). The structure of complex 1 contains 〈010〈 lead(II) carboxylate-phosphonate hybrid layers, with the sulfonate group of the carboxylate-sulfonate ligand as the pendant group. In complex 2, the lead(II) ions are interconnected through bridging diphosphonate ligands, and results in the formation of a lead(II) diphosphonate slab, which are further interlinked via hydrogen bonds between non-coordinated phosphonate oxygen atoms to form a 〈001〈 layer. The doubly protonated H2BTC anion is bidentately chelated to a lead(II) ion through a carboxylate group, whereas the neutral H3BTC ligand is intercalated between two layers, forming hydrogen bonds with the non-coordinated carboxylate groups of the H2BTC anion. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.

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