PB3FE2F12 - A NEW FLUOROMETALLATE WITH A TETRAMERIC STRUCTURAL UNIT

Pb3Fe2F12 grown by hydrothermal synthesis, crystallizes in the triclin ic system, space group P1BAR, with a = 7.403(2) angstrom, b = 7.621(2) angstrom, c = 9.890(3) angstrom, alpha = 110.45(2)-degrees, beta = 10 7.98(1)-degrees, gamma = 95.92(2)-degrees, V = 483.12(4) angstrom3, Z = 2. The structure was solved from single crystal data using 3913 inde pendent reflections (R = 0.045 and R(w) = 0.045). Characteristical of this structure is the presence of isolated tetrameric groups [Fe4F20]8 - in form of ''rings'' as previously observed in Ba3A12F12. ''Independ ent'' fluorine ions are also located and their cationic coordination i s discussed. In contrast to Ba3Fe2F12, all the rings are parallel in t he structure.