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Kinetics of Fading of Some Triphenylmethane Dyes: Effects of Electric Charge, Substituent, and Aqueous Binary Mixtures of Dimethyl Sulfoxide and 2‐Propanol
Author(s) -
Samiey B.,
Dalvand Z.
Publication year - 2014
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20831
Subject(s) - chemistry , dimethyl sulfoxide , substituent , triphenylmethane , aqueous solution , bromophenol blue , reaction rate constant , solvent , propanol , hydrogen bond , solvent effects , acetonitrile , inorganic chemistry , photochemistry , organic chemistry , kinetics , methanol , molecule , chromatography , physics , quantum mechanics
The rate constants of alkaline fading of a number of triphenylmethane (TPM) dyes including methyl green (ME 2+ ), brilliant green (BG + ), fuchsin acid (FA 2− ), and bromophenol blue (BPB 2− ) were obtained in aqueous binary mixtures of 2‐propanol (protic solvent) and dimethyl sulfoxide (DMSO) (aprotic solvent) at different temperatures. It was observed that the reaction rate constants of BG + and ME 2+ increased and those of FA 2− and BPB 2− decreased with an increase in weight percentages of aqueous 2‐propanol and DMSO binary mixtures. 2‐Propanol and DMSO interact with the used TPM molecules through hydrogen bonding and ion–dipole interaction, respectively, in addition to their hydrophobic interaction with TPM dyes. The fundamental rate constants of a fading reaction in these solutions were obtained by the SESMORTAC model. Also, the effect of electric charge and substituent groups of a number of TPM dyes on their alkaline fading rate was studied.