The dimeric unit [La(H2O)4(m-PO3C6H4COOH)(m-PO2(OH)C6H4COOH)(m-PO(OH)2C6H4COOH)]2 as building block of layered hybrid material |
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Authors: | Jean-Michel Rueff André Leclaire Paul-Alain Jaffrès |
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Affiliation: | 1. CRISMAT, UMR CNRS 6508, ENSICAEN, Université de Caen Basse-Normandie, 6 boulevard du Maréchal Juin, 14050 Caen, France;2. Université Européenne de Bretagne, France;3. Université de Brest, CNRS UMR 6521, Faculté des Sciences et Techniques, 6 avenue Le Gorgeu, 29238 Brest, France |
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Abstract: | A new hybrid organic–inorganic material with the structural formula unit [La(H2O)4(m-PO3C6H4COOH)(m-PO2(OH)C6H4COOH)(m-PO(OH)2C6H4COOH)]2 (or [La(H2O)4C21H18O15P3]2) has been synthesized under hydrothermal condition from La(NO3)3·6H2O and 3-phosphonobenzoic acid (m-PO(OH)2–C6H4–COOH) which is a rigid organic precursor possessing two types of functional groups: phosphonic acid and carboxylic acid. The two units of the produced hybrid are linked together by hydrogen bonds leading to a layered framework composing of by a repetition of inorganic and organic slices. The organic layers consist of dimeric units made of two meta-phosphono-benzoic acid linked together by hydrogen bonds involving their COOH groups. Two kinds of dimeric units are observed: PO3C6H4COOH?HOOCC6H4PO(OH)2, present 2 times in the structure, and PO2(OH)C6H4COOH?HOOCC6H4PO2(OH). The material crystallises in a monoclinic cell (C2/c (15) space group) with the following parameters: a = 42.515(4) Å, b = 7.4378(6) Å, c = 20.307(2) Å, β = 118.031(6)°, V = 5668.2(9) Å3, Z = 4, density = 1.908 g/cm3. |
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