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Synthesis, Structure and Thermal Behavior of Oxalato-Bridged Rb+ and H3O+ Extended Frameworks with Different Dimensionalities

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Author(s): Hamza Kherfi | Malika Hamadène | Achoura Guehria-Laïdoudi | Slimane Dahaoui | Claude Lecomte

Journal: Materials
ISSN 1996-1944

Volume: 3;
Issue: 2;
Start page: 1281;
Date: 2010;
Original page

Keywords: extended framework | thermal behavior | hydrogen-bonded motifs | hybrid materials | cocrystals | coordination polymers | supramolecular synthesis | ferroïc properties | homosynthon

ABSTRACT
Correlative studies of three oxalato-bridged polymers, obtained under hydrothermal conditions for the two isostructural compounds {Rb(HC2O4)(H2C2O4)(H2O)2}∞1, 1, {H3O(HC2O4)(H2C2O4).2H2O}∞1, 2, and by conventional synthetic method for {Rb(HC2O4)}∞3, 3, allowed the identification of H-bond patterns and structural dimensionality. Ferroïc domain structures are confirmed by electric measurements performed on 3. Although 2 resembles one oxalic acid sesquihydrate, its structure determination doesn’t display any kind of disorder and leads to recognition of a supramolecular network identical to hybrid s-block series, where moreover, unusual H3O+ and NH4+ similarity is brought out. Thermal behaviors show that 1D frameworks with extended H-bonds, whether with or without a metal center, have the same stability. Inversely, despite the dimensionalities, the same metallic intermediate and final compounds are obtained for the two Rb+ ferroïc materials.
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Tango Jona
Tangokurs Rapperswil-Jona