Abstracthost lattice, the crystal structure of [Zn(bpy) 2-(ONO)]NO 3 (2) has also been determined. Crystals of (2) were prepared as reported by Proctor, Hathaway, Billing, Dudley & Nicholls (1969) for the pure Cu n complex with the stoichiometric amount of Zn(NO3)2.6H20. Large crystals were obtained if methanol rather than ethanol was used in the preparation. (Composition: found: C = 49.07, H = 3.52, N = 17.34, Zn = 13.29%; C20H~6N 5-O2Zn+.NO3 requires: C = 49. 44, H = 3.29, N = 17.30, Zn = 13.46%.)

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The single-crystal e.s.r. spectra and polarised electronic spectra of the copper(l1) doped [Zn (bipy),(ONO)] [NO,] system are shown to be closely comparable to those previously reported for [Cu(bipy),(ONO)] [NO,].The observation of more than four copper hyperfine lines in the single-crystal e.s.r. spectrum measured in the approximate bc plane is consistent with a two-dimensional misalignment of the CuN,N' ,O, chromophore and the temperature variability of the g and A factors are consistent with a two-dimensional fluxional model of the CuN,N' ,O, chromophore with a distorted square-pyramidal 4 + 1 + 1 structure and nor with static disorder. This suggests that the structures of [Cu(bipy),(ONO)] [NO,] and [Cu(bipy),(ONO)] [BF,] are not genuine static stereochemistries of the copper(l1) ion, but arise as a consequence of the fluxional model and are best referred to as pseudo cis distorted-octahedral structures. The electronic properties of 0.1 -1 00% copper(1l) doped [Zn(bipy),(ONO)] [NO,]are shown to be independent of the copper(1l) concentration, and this suggests that the structure. of the doped CuN,N' ,O, chromophore is independent of the structure of the ZnN,N' ,O, chromophore of the zinc host lattice, but correlates with the known structure of the [Cu(bipy),(ONO)] [NO,] complex, an example of the Non-co-operative Jahn-Teller Effect. The electronic reflectance spectrum of [Cu(bipy),(ONO)] [BF,] is closely comparable to that

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