Investigation of acid sites in a zeotypic giant pores chromium(III) carboxylate.

摘要: A study of the zeotypic giant pores chromium (III) tricarboxylate CrIII3OF x (OH) 1-x (H2O) 2⊙{C6H3−(CO2) 3} 2⊙ n H2O (MIL-100) has been performed. First, its thermal behavior, studied by X-ray thermodiffractometry and infrared spectroscopy, indicates that the departure of water occurs without any pore contraction and no loss in crystallinity, which confirms the robustness of the framework. In a second step, IR spectroscopy has shown the presence of three distinct types of hydroxy groups depending on the outgassing conditions; first, at high …