Synthesis and Spectrophotometric Study of Deprotonation of Octamethylporphyrin Derivatives with 1,8-Diazabicyclo [5.4.0] undec-7-ene in Acetonitrile

摘要

Acidic properties of synthesized 5,10,15,20-tetrakis(4'-tert-butylphenyl)-2,3,7,8,12,13,17,18-octamethylporphyrin and 5,10,15,20-tetrakis(3',5'-di-tert-butylphenyl)-2,3,7,8,12,13,17,18-octamethylporphyrin have been studied by spectrophotometry. Deprotonation of the intracyclic nitrogen atoms with 1,8-diazabicyclo [5.4.0]undec-7-ene in acetonitrile occurs in two steps. Deprotonation constants and ranges of the porphyrins-anionic forms existence have been determined, and influence of the peripheral substituents on acidic properties of the macrocyclic ligand has been elucidated.