Oxyfluorinated compounds with open structure XI. Interaction between the ULM-3 type framework and linear diamine templates of different chain lengths studied by X-ray diffraction and solid-state nuclear magnetic resonance characterization

Abstract

The synthesis and structural characterization of oxyfluorinated microporous gallophosphates with the ULM-3 type are presented. This material is hydrothermally prepared (180°C, autogenous pressure, 24 h) by using linear diamines [H 2N(CH 2) 3–5NH 2] as templates. The structures of the phases obtained with the variable organic chain lengths were examined by single-crystal X-ray diffraction (XRD) and 31P, 19F, 13C solid-state nuclear magnetic resonance (NMR) spectroscopy. This study showed that the relative flexibility of the C 3C 5 diamines allows the preservation of the topology of the type ULM-3. In this series, the presence of fluorine, which is found in the bridging position between two gallium atoms, is strongly correlated to the existence of hydrogen bonds with ammonium groups of the organic molecules.