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The reaction of CuII halides with 4,5-diazaflouren-9-one (dafone) in acetonitrile and in the presence of halogens gave four novel compounds: [Cu(dafone)2Cl2]Br2 (1), [Cu(dafone)2Br2]Br2 (2), [Cu(dafone)2(CH3CN)2](IBr2)2 (3), and [Cu(dafone)2(CH3CN)2](Br3)2(Br2)2 (4). The well-known preference of dafone to form an unsymmetrical chelate with Cu2+ directs the halide ion and acetonitrile to the equatorial plane of the octahedral complex. In 1 and 2, dibromine links the neutral halo complex molecules to form infinite chains of the previously known neutral molecules. The acetonitrile complex in 3 has the symmetrical mixed trihalide (IBr2–) as a counterion, while in 4 the cation is surrounded by a tribromide-dibromine network. Raman, EPR, optical absorption, and luminescence characteristics are discussed. The dibromine molecules in 1 and 2 provide a pathway for weak magnetic coupling along the chain polymer. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

The reaction of CuII halides with 4,5-diazaflouren-9-one (dafone) in acetonitrile and in the presence of halogens gave four novel compounds: [Cu(dafone)2Cl2]Br2 (1), [Cu(dafone)2Br2]Br2 (2), [Cu(dafone)2(CH3CN)2](IBr2)2 (3), and [Cu(dafone)2(CH3CN)2](Br3)2(Br2)2 (4). The well-known preference of dafone to form an unsymmetrical chelate with Cu2+ directs the halide ion and acetonitrile to the equatorial plane of the octahedral complex. In 1 and 2, dibromine links the neutral halo complex molecules to form infinite chains of the previously known neutral molecules. The acetonitrile complex in 3 has the symmetrical mixed trihalide (IBr2–) as a counterion, while in 4 the cation is surrounded by a tribromide-dibromine network. Raman, EPR, optical absorption, and luminescence characteristics are discussed. The dibromine molecules in 1 and 2 provide a pathway for weak magnetic coupling along the chain polymer. [ABSTRACT FROM AUTHOR]