The reactions of [Cu(hfac),] (Hhfac = 1,1,1,5.5,5-hexafluoropentane-2,4-dione) with diazines (tmpyz = 2.3.5-trimethylpyrazine, mpym = 5-methylpyrimidine and mpydz = 3-methylpyridazine) in light petroleum have been studied and the following complexes obtained: [{Cu( hfa~),}~(p-trnpyz)~] 1 b, mpym)] 2c. [Cu(hfac),(mpym),] 2d. and [Cu(hfac),(mpydz),] 3d. The crystal structures of 1 b, 2b and 3d have been determined. Although 1 b and 2b are both trinuclear complexes with bridging diazole
The preparation of several kinds of [Cu(tfa)2(Hpzl)4] (Htfa = trifluoroacetic acid; Hpzl = 1H-pyrazoles) by stoichiometric reactions of [Cu(hfac)2] (Hhfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione) with a pyrazole in petroleum ether is reported. As isolable intermediate of this reaction, [Cu(hfac)2(Hpzl)4] was obtained in some cases. The structure of [Cu(tfa)2(4-Hmpz)4] (1e) (4-Hmpz = 4-methyl-1H-pyrazole) has been determined by X-ray analysis. The structures of other [Cu(tfa)2(Hpzl)4] are estimated on the basis of their IR spectra.
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