Abstract: Kinetics of the coordination reaction of tetrakis(N-carbomethoxymethyl-3-pyridyl) porphyrin(abbr,H₂T_β-N-ACMSPyP) and tetrakis(N-methylcarbonitrile-3-pyridyl) porphyrin(abbr.H₂T_β-N-ECNSPyP)with Cu(Ⅱ) ion has been studied in latic acid buffer solution in the range of pH 3-5 and an ionic strength of 0.5 mol/L(KCI)at 35.0±0.1℃.The reaction is catalyzed by lactic ion.The effect of concentration of the catalyst and metal ion, and pHvalue of solution was discussed.The observed rate constants of the reaction were obtained as k_obs=k{(1.0+b₁[L]+b₂[L]²)/(1.0+K₃,4[H⁺]²)}[Cu²⁺];k=5.39 mol^-1·L·s^-1,b₁=3.73 ×10² mol^-2·L²·s^-1,b₂=4.76×10⁴ mol^-3·L³·s^-1 for H₂T_β-N-ECNSPyP; k=1.24 mol^-1·L·s^-1,b₁=4.00×10² mol^-2·L²·s^-1,b₂=2.75×10⁵ mol^-3·L³·s^-1 for H₂T_β-N-ECNPyP.The mechanism of the reaction was proposed.The deformation of the ring of porphyrins is the general condition in the reaction.

Key words: Tetra(pyridyl)porphyrin derivative, Kinetics of incorporating reaction, Formation reaction of copper(Ⅱ)porphyrin