Spectrophotometric investigation of the effect of β-cyclodextrin on the intramolecular cyclization reaction of catecholamines using rank annihilation factor analysis

Kinetic study of the oxidation and nitration of catechols in the presence of nitrous acid ionization equilibria

“…Moreover, investigation of the reaction mechanism containing both kinetic and equilibrium are often reasonably complex processes and may be interesting from theoretical and practical points of view [19]. Rank annihilation factor analysis (RAFA) as an efficient chemometric technique is used to determination of the rate constants of reactions [20,21].…”

Investigation of formation constant of complex of a new synthesized tripodal ligand with Cu²⁺ using rank annihilation factor analysis in surfactant media

“…It was modified by Lorber to yield a direct solution of a standard Eigen-value problem [14] and can be employed to quantitatively analyze gray systems with an unknown background. RAFA has been used in different fields including spectrophotometric study of chemical kinetics [15,16], spectrophotometric determination of acid dissociation constants and the formation constants of metal-ligand complexation [17][18][19]. In this work we used RAFA for the determination of the stability constants of Cu 2+ with the recently synthesized tripodal ligand.…”

Application of central composite design and rank annihilation factor analysis for optimization of mixed chelate of UO2 2+ complex with ammonium-N,N-tetramethylenedithiocarbamate and estimation of Kf value

“…Spectrophotometry is a convenient and widely used technique for qualitative and quantitative analysis since the common availability of the instrumentation, the simplicity of procedures, and precision. In addition, the accuracy of the method makes it still attractive [18,19]. Rank annihilation factor analysis (RAFA) is an effective chemometric tool that the idea behind it, is the rank analysis of two way spectrum data, and quantitatively can be used to analysis of mix systems with unknown background.…”

“…Lorber (1984Lorber ( -1985 modified the iterative procedure of Ho for the aim of the direct solution of standard eigenvalue problem. RAFA has been used in different fields, including spectrophotometric study of chemical kinetics [18], spectrophotometric determination of acidity constants of some organic compounds, and the formation constants of metalligand complexation [24][25][26][27]. Also RAFA combined with the optimization of kinetic parameters was reported [28].…”

“…Due to the crucial phenomenon, the stability constants, which are the main key to understand the chelation reactions, of uranium-ligands have been widely subjected to study by different researchers [15]. Various techniques have been employed for determination of stability constants of metal and ligand complexes, generally named potentiometric titration, conductometry, voltametry, capillary electrophoresis, capillary isotachophoresis and spectrometric [16][17][18]. Spectrophotometry is a convenient and widely used technique for qualitative and quantitative analysis since the common availability of the instrumentation, the simplicity of procedures, and precision.…”