Self-Assembled Monolayers of Cucurbit[6]uril on a Gold Electrode for 4,4′-Oxydianiline Determination. Analytical Application

Self-assembled monolayers of cucurbit[6]uril (CB[6]) on a gold electrode have been used for 4,4-oxydialine (ODA) analysis. The formation of the supramolecular complex between ODA and CB[6] was used for the molecular selection and the electroanalytical determination of this analyte. In addition to this, all the parameters affecting the modification of the gold electrode and the determination of 4,4-oxydianiline were optimized by square wave voltammetry. Upon the electrode modification, pentanethiol was employed to fill up the exposed surface between CB[6] molecules. The calculated detection and determination limits were 0.06 mu gmL1 and 0.19 mu gmL1, respectively, with good accuracy and precision as shown by the calculated values for the relative error and relative standard deviation (Er=0.1% and RDS=2.9%; n=10 ). Moreover, the developed methodology was successfully applied to the 4,4-oxydialine determination in real wastewaters and shoe-dyeing samples.