Polyhalide Ions (Br < inf > 8 < /inf > < sup > 2- < /sup > and I < inf > 2 < /inf > Br < inf > 6 < /inf > < sup > 2- < /sup > ) and Chains (···Br < inf > 3 < /inf > < sup > - < /sup > ···Br < inf > 2 < /inf > ··· and ···IBr < inf > 4 < /inf > < sup > - < /sup > ···) Stabilised by Using Cu(dafone) < inf > 3 < /inf > < sup > 2+ < /sup > as Counter Ion (dafone = 4,5-Diazafluoren-9-one)

Abstract

Two new iodobromides [I2Br62- (analogue of I82- and Br82-) and IBr4- (analogue of Br5- and I2Br3-)] and new chains formed from Br3-, Br2 and IBr4- have been obtained in three compounds all containing the same CuII tris-chelate cation Cu(dafone)32+ {[Cu(dafone)3](Br3)(Br5) (1), [Cu(dafone)3](Br5)(Br8)0.5·CH3CN (2) and [Cu(dafone)3](IBr4)(I2Br6)0.5·CH3CN (3)} by a procedure employing bromine, iodine, CuII bromide and dafone in acetonitrile. The formation of chains and isolated polyhalide ions is facilitated by templating with the tris-chelate cation. The Raman spectra of the polyhalides and EPR and other spectral characteristics of the fluxional CuII complex cation are presented.