Mixed-ligand Complexes of Copper(II). I. An ESR Study of Coordination Bonding
スポンサーリンク
概要
- 論文の詳細を見る
The sample solutions were prepared by mixing equal volumes of any two of the 1.00×10<SUP>−2</SUP> mol/<I>l</I> solutions of the 1:2 complexes of copper(II) with ethylenediamine, <I>N</I>,<I>N</I>-dimethylethylenediamine, <I>N</I>,<I>N</I>-diethylethylenediamine, 1,3-diaminopropane, L-alanine, L-serine, <I>N</I>,<I>N</I>-diethylglycine, and β-alanine, where an equivolume mixture of water and methanol was used as the solvent. The X-band ESR measurements for these sample solutions were carried out at the temperature of liquid nitrogen. The observed ESR line shapes showed that only the mixed-ligand complexes are formed almost quantitatively in all the solutions except two: equivolume mixtures of the two complex solutions of ethylenediamine and β-alanine and those of ethylenediamine and <I>N</I>,<I>N</I>-dimethylglycine, in which the coexistence of two or more complex species was clearly demonstrated. The ESR line shapes and, furthermore, the intensities of the visible absorption indicated that the symmetry of the ligand field of the mixed-ligand complexes is as axial as that of the parent complexes. The ESR experimental results showed that the <I>g</I><SUB>⁄⁄</SUB> value of a mixed-ligand complex almost equals the mean of the <I>g</I><SUB>⁄⁄</SUB> values of its two parent complexes, but that there is not such a clear correlation between their <I>A</I><SUB>⁄⁄</SUB> values. It was interestingly concluded from the determined <I>g</I> values that the covalency of the metal-ligand bonds of a mixed-ligand complex are intermediate in degree between those of its two parent complexes.
- 公益社団法人 日本化学会の論文
著者
-
Yokoi Hiroshi
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
-
Isobe Taro
Chemical Research Institute of Non-Aqueous Solutions, Tohoku University
-
Otagiri Masaki
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
関連論文
- The Coordination Bonding and Stability of the 1 : 1 Complexes of Copper(II) with Various Bidentate Ligands in Aqueous-methanolic Solutions
- ESR and ENDOR studies of the ion pairs of double-, triple-, and quadruple-layered [2.2]paracyclophane radical anions and alkali metal cations.
- Infrared absorption spectrum of gaseous CF3CO radical: Recording on a rapid-scan infrared spectrometer.
- ESR studies on salicylaldehyde Schiff base complexes of copper(II). I. Bis(N-cyclohexyl- and N-cycloheptyl-salicylideneaminato)copper(II) complexes and their derivatives in polycrystals.
- Solvent effects on the ESR spectra of copper(II) complexes. A consideration of the donicity of water and methanol.
- An ESR study of the interaction of copper (II) octaethylporphyrin with .PI. acceptors.
- An ESR Study of Nitric Oxide Adsorbed on Silica Gel
- ESR Studies of Methyl Radicals Stabilized on Silica-gel Surfaces
- An ESR Study of NO2 Adsorbed on Silica Gel Surfaces
- A re-investigation of the conformational interconversion in the 1,2,3,6,7,8-hexahydropyrene anion radical by ENDOR.
- Mixed-ligand Complexes of Copper(II). II. A Study of Dismutation Constants
- Mixed-ligand Complexes of Copper(II). I. An ESR Study of Coordination Bonding
- ESR Spectra of Quadridentate Salicylaldehyde Schiff Base Complexes of Cobalt(II) and Copper(II) in Chloroform and in Dichloromethane
- NMR studies of the pyridine exchange reaction in the pyridine adduct of bis(salicylaldehydato)nickel(II).
- Triplet Dimers Observed for Several β-Diketone Chelate Complexes of Copper(II) in Toluene
- A re-investigation of the dimer ESR spectra in several quadri-dentate Schiff base complexes of copper(II).
- Thermochromisms of Some β-Diketone Chelate Copmlexes of Copper(II) in Pure Pyridine