Hybrid Structures Formed by Lead 1,3-Cyclohexanedicarboxylates

Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. 0., Bangalore 560064, India 

Materials. Pb(N03)2 (Qualigens, Mumbai, India, 99%), 1,3-cyclohexanedicarboxylicacid, U3-H2CHDC [Aldrich, 98%, mixture of cis and trans (anti) compounds], and NaOH (Merck, Mumbai, India, 99%) of high purity and double distilled water were used for the synthesis. 

Powder XRD patterns of the products were recorded using Cu Ka radiation (Rich-Seifert, 3000TT). The patterns agreed with those calculated for single-crystal structure determination. Thermogravi-metric analysis (TGA) was carried out (Metler-Toledo) in an oxygen 

Two-Dimensional [(0Pb4)2(0H)2(C20,i)(l,3-CHDC)4]-H2O. We have been able to obtain a lead oxalate— cyclohexanedicarboxylate, [(OPhOXOHXfCjOgX 1,3-CHDC)4] HjO, n, where the oxalate moiety was generated in situ from the 1,3-CHDC under the hydrothermal synthesis. Similar cases, where the ligands are formed in situ during the synthesis, have been reported in the literature.32-34 The formation of the oxalate in the synthesis of II is rather 

The seven oxygens of Pb(2)C 7 come from six different CHDC anions (two acid-1 and four acid-2). Six of these oxygens have fi3 connections linking Pb(2) with two different Pb(l) through two oxygen atoms and with two other Pb(2) 

Drumel, S. Janvier, P. B-Doeuff, M. Buujoli, B. Chem. Mater. 1997, 

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