Chemical Physics Letters, Vol.677, 107-113, 2017
Spectroscopic and theoretical studies of anionic corroles derived from phosphoryl and carbomethoxyphenyl substituted corroles
Anionic corroles were obtained by the addition of aliquots of basic anions such as CN-, F-, OAc- and H2PO4- to free base corroles 5,10,15-triphenylcorrole (1), 5,10,15-tris(4 '-diethoxyphosphorylphenyl)cor role (2) and 5,10,15-tris(4 '-carbomethoxyphenyl) corrole (3) in aprotic solvents at 298 K. The 1:2 (corrole-to-anion) stoichiometry was confirmed by Hill plot and DFT studies. The dianionic corroles derived from 2 and 3 exhibited a dramatic red-shift (Delta lambda(max) = 14-24 nm) in B band as compared to that of free base corroles (2-3) while the opposite trend was observed in fluorescence spectral features with the enhanced fluorescence intensity. The anion-induced deprotonation constants (K-d) of corroles (1-3) depend on the basicity of the anion used and the acidic nature of free base corrole core. The presence of excess protic solvent disfavors the formation of dianionic corroles. (C) 2017 Elsevier B.V. All rights reserved.