Crystal structure of new hydroxide fluorides with isolated F- anions: [H3N(CH2)(6)NH3](2)M(F, OH)(6)(F,OH)center dot H2O (M = Al, In)

The synthesis and structural characterization of new hydroxo-fluorometallat es [H3N(CH2)(6)NH3](2)M(F,OH)(7)-H2O (M = Al, In) are presented. Their prep aration is achieved in solvothermal conditions by microwave or classical he ating. The isotopic structures, determined by single crystal X-ray diffract ion, are triclinic with the space group P-1. The structural arrangement can be described from isolated MX6 (X = F, OH) octahedra connected by diproton ated diaminohexane via a complex network of hydrogen bonds. X- anions and w ater molecules are found between the organic chains. A study by F-19 NMR of the Al compound confirms a statistical occupancy of fluorine sites by hydr oxyl groups and the occurrence of isolated F- anions. (C) 2001 Elsevier Sci ence B.V. All rights reserved.