MECHANISM STUDY OF H+ ION TRANSFER ACROSS WATER NITROBENZENE INTERFACE ASSISTED BY TETRAPHENYLPORPHYRIN AND ITS 1ST-TRANSITION METAL COORDINATION-COMPOUNDS

The effects of tetraphenylporphyrin (H-2TPP) and its first transition-metal coordination compounds (MTPP) on H+ ion transferring across the water/nitrobenzene (NB) interface had been investigated by using the system of microcomputer controlled four-electrode potentiostat with the positive feedback. The results showed that H-2TPP and MTPP did assist the H+ ion transferring across the W/NB interface to different extent. Under the condition of H+ concentration (W) being lesser than the H-2TPP concentration (NB), the process of H+ ion transferring across the W/NB interface faciliated by H-2TPP was reversible and diffusion-controtted. As far as the MTPP was concerned, the sequence of their relative activities is: NiTPP>MnTPP>CoTPP, CuTPP>ZnTPP, FeClTPP, this order consisted with the sequence of their stability. Based on the experimental results, an apparent kinetic mechanism of H+ ion transferring across the W/NB interface facilitated by H-2TPP was proposed