Synthesis, Structure and Thermal Behavior of Oxalato-Bridged Rb(+) and H(3)O(+) Extended Frameworks with Different Dimensionalities

Correlative studies of three oxalato-bridged polymers, obtained under hydrothermal conditions for the two isostructural compounds {Rb(HC(2)O(4))(H(2)C(2)O(4))(H(2)O)(2)}(∞)(1), 1, {H(3)O(HC(2)O(4))(H(2)C(2)O(4)).2H(2)O}(∞)(1), 2, and by conventional synthetic method for {Rb(HC(2)O(4))}(∞)(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 H(3)O(+) and NH(4)(+) 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.