Ternary charge transfer complexes. IV. Complexes with Fe, Nb, Ta, Mo, W, or U in the anion

NOMX6•aromatic charge transfer complexes are formed from NOX and NbX5 or TaX5, where X may be F or Cl and the aromatic portion is a methyl-substituted benzene. NOMoF6, NOUF6, NOUF7, and NOWCl7•aromatic complexes have been identified but only oxyfluoro species have been isolated when M is Mo, W, or U. NOTaCl6•hexamethylbenzene crystallizes in the trigonal space group P32, with a = 9.822(3), c = 17.469(7) Å. NOFeCl4•hexamethylbenzene [Formula: see text] crystallizes in the orthorhombic space group Ccmb, with a = 14.8009(20), b = 15.7683(10), c = 17.3913(14) Å. High conductivity in these complexes appears to depend upon a long N—O bond.