Open AccessStudy of Electron Transfer Reactions Associated with Benzyl Viologen-β-Cyclodextrin Complexation in Buffer Solution of pH 7: Equilibrium and Kinetic Aspects
Author(s) -
Shazia Perveen,
Iftikhar Imam Naqvi,
Summyia Masood
Publication year - 2020
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2020.22736
Subject(s) - chemistry , viologen , dication , electron transfer , buffer solution , reaction rate constant , cyclic voltammetry , equilibrium constant , electrochemistry , redox , inorganic chemistry , cyclodextrin , stability constants of complexes , photochemistry , kinetics , aqueous solution , molecule , organic chemistry , electrode , physics , quantum mechanics
In this study, complex formation of benzyl viologen dication (BzV2+) with β-cyclodextrin (β-CD), inits different oxidation states, had been studied in buffer solution of pH 7, through cyclic voltammetry.In buffer solution of pH 7, extensive deposition of benzyl viologen neutral (BzVº) has been found.Further to that first redox process of BzV2+ was found reversible in buffer solution of pH 7. Benzylviologen mono-cation (BzV+•) was found to interact with β-CD reversibly according to EC mechanism.Equilibrium constant of BzV+•-nβ-CD complex in buffer solution of pH 7, has been calculated as 5.49M-n. The value of n was found to be 0.2. The bimolecular rate constant for the complex formation ofBzV+• with β-CD was found to be 6.44 M-ns− in buffer solution of pH 7. This study is based upon anelectrochemical approach to obtain the bonding equilibrium constant, the rate constants of formationand the association numbers of the complex formed between reduced forms of viologen and β-CD.This study explore the electron transfer reaction mechanism of benzyl viologen with β-CD to extendtheir applications at neutral pH.