TY - JOUR
T1 - Spectrophotometric and Electron Spin Resonance Studies on Acetylacetonato(N, N, N’, N’-tetra-methylethylenediamine)copper(II) Tetraphenylborate in Various Solvents
AU - Lim, Y. Y.
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1987
Y1 - 1987
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, v, 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 v (cm-1) 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, a, 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 also gave a values similar to those obtained from the solution spectra. The relationship gƖ > g⊥was found in all solvents, indicating the presence of elongated tetragonal symmetry.
AB - 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, v, 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 v (cm-1) 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, a, 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 also gave a values similar to those obtained from the solution spectra. The relationship gƖ > g⊥was found in all solvents, indicating the presence of elongated tetragonal symmetry.
UR - http://www.scopus.com/inward/record.url?scp=84970544803&partnerID=8YFLogxK
U2 - 10.1071/CH9870121
DO - 10.1071/CH9870121
M3 - Article
AN - SCOPUS:84970544803
SN - 0004-9425
VL - 40
SP - 121
EP - 127
JO - Australian Journal of Chemistry
JF - Australian Journal of Chemistry
IS - 1
ER -