Standard molar enthalpies of formation of eight copper(II) fluorinated β-diketonates.: Mean (Cu-O) bond dissociation enthalpies

The standard (p degrees = 0.1 MPa) molar enthalpies of formation of eight copper(II) fluorinated beta-diketonates at the temperature 298.15 K were determined by high-precision solution and reaction calorimetry. The standard molar enthalpies of sublimation of the same copper(II) complexes at the temperature 298.15 K were determined by effusion methods. From the enthalpies of formation of the complexes in the gaseous state, the average molar dissociation enthalpies [D-m] (Cu-O) were derived and compared with identical parameters obtained for non-fluorinated copper(II) beta-diketonates. [GRAPHICS] The following abbreviations are used in the table: HTFBA, 4,4,4-trifluoro-1-phenylbutane-1,3-dione; HTFFBD, 4,4,4-trifluoro-1-(2-furanyl)-butane-1,3-dione; HTFNBD, 4,4,4-trifluoro-1-(2-naphthyl)-butane-1,3-dione; HTFHD, 1,1,1-trifluorohexane-2,4-dione; HTFMHD, 1,l,1-trifluoro5-methylhexane-2,4-dione; HTFDHD, 1,1,1-trifluoro-5,5-dimethylhexane 2,4-dione; HTFMHPD, 1,1,1-trifluoro-5-methylheptane-2,4-dione; HHPFDOD, 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dione. (C) 1998 Academic Press.