THE X-RAY CRYSTAL-STRUCTURE AND ELECTRONIC-PROPERTIES OF [CU(BIPY)2(ONO)][NO3](BIPY=2,2'-BIPYRIDYL) AT 298-K AND 165-K, A FLUXIONAL CIS-DISTORTED OCTAHEDRAL CUN4O2 CHROMOPHORE
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abstract
The X-ray crystal structures of [Cu(bipy)2(ONO)][NO3] (bipy = 2,2-bipyridyl) are reported at 298 and 165 K; significant differences occur which are consistent with a fluxional behaviour of the CuN4O2chromophore, and enable the underlying static stereochemistry to be predicted and rationalised using the i.r. spectrum of the nitrito-group and the electronic reflectance spectrum of the CuN4O2chromophore.