Preferential solvation studies using the solvatochromic dicyanobis(1,10-phenanthroline)iron(II) complex

Abstract

Solvent e †ects on the electronic spectra of dicyanobis(1,10-phenanthroline)iron(II) have been investigated in thirteen pure solvents and twenty binary solvent mixtures. In pure solvents, the shifts of the values are found to depend l max on more than one of the known solvent parameters (AN, a, b, DN and n*). AN, a and n* are found to be the most important solvent parameters, exerting a considerable e †ect on the solvatochromic shifts of the title complex. The preferential solvation of dicyanobis(1,10-phenanthroline)iron(II) in binary solvent mixtures has been investigated by monitoring the metalÈligand charge transfer band of the indicator complex. Organic solvents are preferred near the indicator complex in aqueous binary solvent mixtures (negative deviation), except in regions rich in MeCN, and 1,4-dioxane, where water molecules are preferred over the organic component (dual behavior). Me 2 CO However, the indicator complex is preferentially solvated by the component which has the higher acceptor number in non-aqueous binary solvent mixtures. Negative deviation was observed in binary mixtures of and CHCl 3 with alcohols and positive deviation in mixtures of with THF, DMSO and Di †erent Me 2 CO CHCl 3 Me 2 CO. criteria were considered to evaluate the extent of preferential solvation in di †erent solvent mixtures, viz., the local molar fraction the excess function (*X), the iso-solvation point and the preferential solvation constant (X A L), (X B iso) The preferential solvation data have been linearly correlated with the di †erent solvent parameters.

Metastable β‐Bi2O3 Nanoparticles with Potential for Photocatalytic Water Purification Using Visible Light Irradiation

“…In general, the adsorption behavior of the dicyanobis(1,10-phenanthroline)iron(II) complex on a surface can be used to determine the hydrogen-bond-donating ability of a metal oxide surface, which is expressed as α . The value of α can be determined by using the Equation (1):[27]…”

Synthetic approach towards ‘click’ modified chalcone based organotriethoxysilanes; UV-Vis study

“…Negative solvatochromism corresponds to a hypsochromic shi (blue shi) whereas the reverse is referred to as positive solvatochromism or a bathochromic shi (red shi). 52 This is the rst time, to the best of our knowledge, that a solvatochromic effect has been reported for OTES.…”

Investigations of absorption and emission spectral data in mixed liquid media. A short review of recent literature

“…Iso-solvation point, X iso X iso is the solvent composition in the bulk at whichν 12 of the solute in the binary solvent mixtures lies midway between theν 12 values for the pure solvent components X 2 iso b 0.5 -negative deviation from ideal solvation appears; indicating a preference for solvent 2 over solvent 1 [57,58]. X 2 iso N 0.5 -positive deviation from ideal solvation occurs; indicating a preference for solvent 1 over solvent 2 [57,58]. Preferential solvation constant, K PS K PS ¼…”