in neat (no solvent, solid phase) storage in vac. desiccator over P2O5;

in further solvent(s) dissolving of Cu(CH3COO)2*H2O in anhyd. CF3COCH2COCF3; boiling for 5 min;; evapn. of the excess of diketone; recrystn. of the residue from CCl4;;

in water addn. of 4M NaOH to a soln. of Cu-acetate and CF3COCH2COCF3*2H2O in H2O; heating in water-bath for 1 h; cooling down;; pptn.; filtration; recrystn. from 5percent ethanol;;

in diethyl ether; water aq. soln. of copper acetate mixed with ether soln. of β-diketone; ether layer sepd.; repeated extd. (ether); ether exts. combined; dried (MgSO4); evapd.; ppt. recrustd. (2-3 times); IR; m.p.; elem.anal.;

in tetrachloromethane mixt. of freshly prepared Cu(OH)2 and acetylacetone in CCl4 boiled and standed overnight at room temp.; ppt. filtered, recrystd. (CHCl3), sublimed at 115-120°C, placed in a closed vessel over concd. H2SO4, elem. anal.;

byproducts: Cu((CH3CO)2CH)((CF3CO)2CH), Y((CH3CO)2CH)3; sublimated at 135°C; elem. anal;

preparation of Cu-films on various substrates using chemical vapor deposition from the Cu(II)-precursor in ethanol or isopropanol (liquid delivery approach);; thin film obtained; cross-sectional scanning electron microscopy, Rutherford backscattering spectra;;