Abstract
Hydrothermal reactions of lead(II) acetate with N, N′-piperazinebis(methylenephosphonic acid) (H 2O 3PCH 2N(C 2H 4) 2NCH 2PO 3H 2, H 4L 1) and 5-sulfoisophalic acid monosodium salt (NaH 2SIP) or lead(II) acetate with isopropylimino-bis-(methylenephosphonic acid) ((CH 3) 2CHN (CH 2PO 3H 2) 2, H 4L 2) and succinic acid afforded two new lead(II) phosphonate hybrids, namely, Pb 4(H 2L 1)(SIP) 2(H 2O) 4·2H 2O 1 and Pb 4(L 2) 2·(HO 2CH 2CH 2CO 2H) 2. The structure of compound 1 features a 3D network formed by Pb(II) ions interconnected by H 2L 1 and the carboxylate–sulfonate SIP anions. The 3D network can be viewed as the neighboring layers of Pb 4(SIP) 2 being interconnected by H 2L 1 ligands to form a pillared layered architecture. The phosphonate groups of the diphosohonate ligands bridge the Pb(II) ions of the Pb 4(SIP) 2 layer to form a lead(II) phosphonate–sulfonate hybrid layer and the organic group of phosphonate ligand as pillars. In compound 2, the interconnection of the lead(II) ions via diphosphonate ligands lead to a 〈400〉 lead(II) diphosphonate layer. The succinic acid remains protonated and is located at interlayer space. The second ligand in compound 1 acts as a multidentate metal linker, whereas the succinic acid in compound 2 functions as an intercalated species in between the 2D layers.
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