Interaction of ninhydrin with zinc(II) complex of tryptophan in the three dicationic gemini surfactants

Present work concerns with the interaction of ninhydrin with zinc(II) complex of tryptophan ([Zn(II)-Trp](+)) in the three dicationic gemini surfactant systems. To record critical micellar concentration (CMC) and absorbance, we have used Systronics conductivity meter and UV-visible spectrophotometer, respectively. Experiment opens up the fractional- and first-order paths in ninhydrin and complex, respectively. Gemini micellar medium is found more superior over aqueous medium. Rate constant (k(psi)) vs. [gemini] plot shows the unusual role of geminis on k(psi). k(psi) increases with gemini concentration (at concentrations lower than the CMC, part I) and leveling-off regions obtain (concentration up to 400x10(-5) mol dm(-3), part II). Characteristics of part I and part II are just the same as that of conventional surfactant. Later, gemini produces a third region of increasing k(psi) at higher concentrations ([gemini]>400x10(-5) mol dm(-3), part III). Detail and systematic elucidation about the effect of surfactants are mentioned and discussed in the text. Binding constants (K-S for [Zn(II)-Trp](+) and K-N for ninhydrin) and rate constant (k(m) in geminis) were determined by nonlinear least squares regression technique. The kinetic results acquired can reasonably be interpreted by pseudo-phase model of surfactant micelles.