Abstract
The two methods gave successfully the interfacial absorption spectra. The capillary plate method seems superior to the other in the simplicity of device, the stability of the interface and the reproducibility. The detection limit in this method can be improved by the use of multiple plates. The fraction of interface in a liquid-liquid system can be evaluated in terms of the specific interfacial area, a. The specific interfacial area for the stir cell is determined by the diameter of droplets, d, through the equation of a=6/d, which yields 67cm-1 for the present system. On the other hand, the specific interfacial area for the capillary plate is determined solely by the thickness of the organic phase with the equation of a=2/1, which affords 20cm-1 for the present case.
Though the value of a of the optical stir cell is larger than the other, the spectrum observed in the stir cell method is seriously interfered with by refraction at the toluene droplet surface.
Further investigations on the interfacial reactions, including protonation and metal complex formation, are in progress in which the Teflon capillary plate method is being used.
