Spektrophotometrische Untersuchungen �ber Chlorokomplexe von Co++, Ni++ und Cu++ in acetonitril und Trimethylphosphat

Spectrophotometric study of copper(II) chloride-trimethyl phosphate solutions. Thermodynamic and spectroscopic properties of copper(II) chloro complexes in nonaqueous solutions

“…The comparison of the calculated coordinates of the isosbestic points in the case of the [1,2,3] and [1,2,3,4] models with the experimental data indicates clearly the better correlation in the case of the [1,2,3,4] model.…”

“…These difficulties are partly overcome in our work by using an original numerical procedure created by two of us (J.M., F.V.) in which essentially the tj values are considered as 8j functions.16 In DMF and Me2SO media, we demonstrated in previous pa-pers12,13 that the [1,3,4] and [1,2,3,4] models were equivalent by considering the numerical results; the absence of the dichlorocomplex in the [1,3,4] model was related to comparable donor number of both the ligand and the solvent, promoting autocomplex formation of the mono-and trichloro complexes as postulated by Gutmann.17 But the CuCl2 electronic spectrum calculated for the [1,2,3,4] model in DMF and Me2SO is very similar to those calculated in the other solvents. We used, consequently, this equivalent [1,2,3,4] model calculated in each DMF and Me2SO medium and allowed an exhaustive discussion of the thermodynamic and spectroscopic properties of the four mononuclear complexes.…”

“…The solvent effect on the stability, the electronic spectra, and the structure of copper(II) chloro complexes is discussed for the [1,2,3,4] model in six aprotic dipolar solvents. A good correlation with the solid-state results is obtained in the absorption bands assignation and in the copper(II) configuration, especially for the tetrachloro complex.…”

Formation of a Monobromo Complex of Nickel(II) in 2-Methoxyethanol

“…If the spectrum formed at Br/Ni ratios of 5-10 is taken as an approximation to the spectrum of " Ionic strength kept at 0.25 by addition of N(C2H6)4C104. 6 Ionic strength kept at 0.15 by addition of N(C2H6)4C104. c 2-cm.…”

Influence of metal coordination on conductivity behavior in poly(butadiene–acrylonitrile)–CoCl2 system

“…If halogenides are added to these solutions, they replace some acetonitrile molecules, and the Co 2+ coordination changes from octahedral to tetrahedral [31]. Experimental studies of the Co 2+ chloro complexes in acetonitrile [32][33][34] ] 2− complex whose electronic spectrum is almost independent on the nature of the solvent [35][36][37]. Since the literature data were scarce, it was necessary to determine more accurately the composition of the chloride-acetonitrile complexes of Co 2+ and obtain the reference spectra of all possible complexes.…”