Novel Layered Lead(II) Aminodiphosphonates with Carboxylate-Sulfonate and 1,3,5-Benzenetricarboxylate Ligands as Pendant Groups or Intercalated Species

摘要

The hydrothermal reaction of lead(II) carbonate with 3-sul-fobenzoic acid,3-HO_3S-C_6H_4-CO_2H,and isopropylimino-bis-(methylenephosphonic acid),(CH_3)_2CHN(CH_2PO_3H_2)_2 (H_4L~1),gave a new layered lead(II) carboxylate-phosphonate,Pb_7(3-O_3S-C_6H_4-CO_2)(L~1)_3(H_2O)_2·2H_2O (1),whereas the hydrothermal reaction of lead(II) carbonate with 1,3,5-benzene-tricarboxylic acid (H_3BTC) and N-cyclohexylimino-bis(me-thylenephosphonic acid),C_6H_(11)N(CH_2PO_3H_2)_2 (H_4L~2),afforded a layered complex,Pb_3(HL~2)(H_2L~2)(H_2BTC)-(H_2O)·H_3BTC·H_2O (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 H_2BTC anion is bidentately chelated to a lead(II) ion through a carboxylate group,whereas the neutral H_3BTC ligand is intercalated between two layers,forming hydrogen bonds with the non-coordinated carboxylate groups of the H_2BTC anion.