Spectrophotometric determination of anilines based on charge-transfer reaction

The molecular interactions between aniline, p-toluidines, benzidine and p-phenylenediamine as electron donors and 7,7,8,8-tetracyanoquinodimethane (TCNQ) as acceptor have been investigated by spectrophotometric method. Different variables affecting the reaction were studies and optimized. At the optimum reaction conditions Beer's law was obeyed in a concentration limit of 0.6–3.0, 0.3–3.0, 0.3–3.0 and 0.3–2.7 μg ml−1 for aniline, p-toluidines, benzidine and p-phenylenediamine. The developed methods were applied successfully for the determination of the studied compounds in waste water and relative standard deviation of the methods were 0.8–3.0%. Percentage recoveries ranged from 97.22% to 102.78%.