Journal of the Chemical Society - Faraday Transactions p. 495 - 502 (1993)
Update date:2022-08-04
Topics:
Sutter, Thimothy P. G.
Rahimi, Rahmatollah
Hambright, Peter
Bommer, Jerry C.
Kumar, Manmohan
Neta, Pedatsur
A series of sulfonated, water-soluble, phenyl-substituted porphyrins has been prepared, containing halogen or alkyl groups in the ortho, di-ortho or para position.While the para-substituted compounds exhibited monomer-dimer behaviour, all the ortho and di-ortho substituted porphyrins were monomeric in aqueous solution at 0.1 mol dm-3 ionic strength.The proton basicities varied over a 105 range along the series, from the strongly basic tetra(4-methoxyphenyl) species to the weakly basic and less deformable sulfonated tetrakis(2,6-dichlorophenyl)porphyrin.Certain of these porphyrins and related metalloporphyrins were reduced by radiolytic methods in aqueous solutions.Pulse radiolysis studies provided the spectra fo the short-lived ?-radical anions and γ-radiolysis led to formation of stable chlorins and phlorins, the products of two-electron reduction and protonation at the β-pyrrole or at the meso postion, respectively.Whereas H2TPPS4
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