Spectrophotometric investigation of nickel(II) chloro complexes in alcoholic solutions |
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Authors: | Mustayeen A Khan Denis Cronier Gilles M Bouet François Vierling |
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Institution: | (1) Faculté de Pharmacie, Laboratoire de Chimie de Coordination, Université d'Angers, 16 Boulevard Daviers, F-49100 Angers, France;(2) Laboratoire de Chimie physique, Unité Associée au CNRS N 405, EHICS, Université Louis Pasteur, 1 Rue Blaise Pascal, F-67000 Strasbourg, France |
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Abstract: | Summary A spectrophotometric study of NiII chloro complexes in the u.v.-vis. region was carried out at 25 °C and constant ionic strength of 1 mol dm–3. A matrix rank treatment method was used to identify two successive mononuclear complexes, NiCl+ and NiCl2, in the three alcohols studied viz. MeOH, EtOH and i-PrOH. The best values for the apparent overall stability constants,
j
, were calculated using a program based on the least-squares method. The log
1 and log
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. |
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