Spectrophotometric investigation of nickel(II) chloro complexes in alcoholic solutions
Résumé
A spectrophotometric study of Ni n chloro complexes in the u.v.-vis, region was carried out at 25 ~ and constant ionic strength of 1 mol dm-3. A matrix rank treatment method was used to identify two successive mononuclear complexes, NiC1 + and NiC12, in the three alcohols studied viz. MeOH, EtOH and i-PrOH. The best values for the apparent overall stability constants, fit, were calculated using a program based on the least-squares method. The log fil and log [t 2 values in MeOH, EtOH and i-PrOH are 1.3 and 1.2, 1.7 and 1.8, and 1.9 and 2.2, respectively. The stability increases directly with the mol. wt. of the solvent, or decreases as a linear function of the permittivity of the pure solvent. The electronic spectra and the formation curves of the two complexes in MeOH solutions were calculated.
Domaines
Chimie
Origine : Accord explicite pour ce dépôt