Dehydration and rehydration processes in microporous rare-earth dicarboxylates: A study by thermogravimetry, thermodiffractometry and optical spectroscopy

The recently discovered microporous materials, [Ln(H2O)](2) [O2C(CH2)(2)CO2 ](3). H2O and [Ln(2)(H2O)](2)[O2C(CH2)(3)CO2](3). 4H(2)O (LII = trivalent r are-earth ion), exhibit a three-dimensional organic-inorganic network with channels containing weakly bonded mater molecules. The ability of these com pounds to reversibly adsorb and desorb these mater molecules in the tempera ture range 25-100 degrees C has been confirmed using thermogravimetry and t hermodiffractometry. In addition, the influence of adsorbed water on the li fetime of the D-5(0) state of Eu3+ has been studied by optical spectroscopy . (C) 1999 Academic Press.