A Channel-Forming Polyiodide Network in [Cu(dafone) < inf > 3 < /inf > ]I < inf > 12 < /inf > . A Tris Chelate of Dafone and a New Planar Structure for the I < inf > 12 < /inf > < sup > 2- < /sup > Ion (Dafone = 4,5-Diazafluoren-9-one)

Abstract

Treatment of an aqueous solution of copper(II) acetate, dafone, and KI with I2 in CH2Cl2 leads to the formation of Cu(dafone)3I12 (1). 1 crystallizes in the orthorhombic system, space group Pbcn, with a = 22.902(4) Å, b = 11.104(2) Å, c = 18.992(7) Å, and Z = 4. Cu(dafone)32+ is the first tris chelate of dafone and is stabilized by a channel-forming network of planar I122- ions. Temperature dependence of the EPR spectrum indicates fluxionality of the cation.