The electronic properties and stereochemistry of the copper(II) ion. Part VI. Bis(bipyridyl)copper(II) complexes

Abstract
The electronic, e.s.r., and i.r. spectra of a series of [Cu bipy2X]Y-type complexes, where X = ONO, HCO2 , MeCO2 , PhCO2 , NCS, ½C2O4 2– and Y = ClO4; where X = Y = ClO4 , NO3 , and BF4 ; and [Cu bipy2NH3]X2, where X = ClO4 and BF4 , are reported. By comparing these electronic properties with those of the trigonal-bipyramidal [Cu bipy2l]I and the cis-distorted octahedral [Cu bipy2(ONO)]NO3 complexes, possible molecular structures are suggested. The complexes with X = ONO or a carboxylate anion have a cis-distorted octahedral stereochemistry; with X = NCS or NH3 and approximately trigonal-bipyramidal stereochemistry is suggested. Possible stereochemistries for the complexes Cu bipy2X2, where X = ClO4 , BF4 , and NO3 , are discussed. The molecular structures of the corresponding [Cu phen2X]Y type complexes are considered to be analogous.
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