
TY  - JOUR
A1  - Lim, YY 
T1  - Spectrophotometric and Electron Spin Resonance Studies on Acetylacetonato(N,N,N',N'-Tetra-Methylethylenediamine)Copper(II) Tetraphenylborate in Various Solvents
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 987
VL  - 40
IS  - 1
SP  - 121
EP  - 127
KW  - 
UR  - https://doi.org/10.1071/CH9870121 
N2  - 1 : 1 equilibrium constants for the Lewis acid-base interaction between acetylacetonato- (N, N, N', N'- tetramethylethylenediamine )copper(II) tetraphenylborate and tetrahydrofuran, pyridine, ethylacetate and N, N- dimethylformamide were obtained at 298 K in 1,2-dichloroethane by u.v .-visible spectrophotometry . The optical absorption maxima, D, of the mixed-chelate copper(II) complex in various donor solvents which decrease as the axial interaction increases were also measured and it was found that no linear correlation exists between C (cm-l) and the solvent donor number. Isotropic hyperfine coupling constants of 63,65Cu, Aiso, and isotropic g values, giso were obtained in various solvents. In general, Aiso decreases but giso increases as the axial interaction increases. The coefficient, &#945;, of the dx2-y2 orbital in the ground state molecular orbital (B1g) was found to decrease with increasing axial interaction. The frozen solution e.s.r. spectra als ; gave &#945; values similar to those obtained from the solution spectra. The relationship g?> g? was found in all solvents, indicating the presence of elongated tetragonal symmetry. 
ER  -

