High-coordination number fluoro- and oxofluoro-anions; IF 6 O – , TeF 6 O 2– , TeF 7 – , IF 8 – and TeF 8 2–

The novel hypervalent, highly coordinated, high-oxidation state anions IF6O–, TeF6O2–, TeF7–, IF8– and TeF82– have been synthesized in anhydrous MeCN using anhydrous N(Me)4+F– as the fluoride ion source; the anions have been characterized by NMR and vibrational spectroscopy and represent novel examples of seven and eight-coordinate species having symmetries C5v(IF6O–, TeF6O2–), D5h, (TeF7–) and D4d(IF8–, TeF82–).