Preparation and characterization of poly(siloxane)-supported metalloporphyrins: the effect of the support on the electronic absorption spectra
作者:H.S. Hilal、M.L. Sito、A.F. Schreiner
DOI:10.1016/s0020-1693(00)80181-4
日期:1991.11
halogenated poly(siloxane) surfaces [9a] Sil-(CH&X, as supports for the metalloporphyrin catalyst, [Mn”‘(TPyP)]. Quatemization reactions have been used to bind the [Mn’n(TPyP)] species to the surface [9b]. We now report our studies of the effect of support on the electronic absorption spectra of several supported metalloporphyrins [M(TPyP)].
Photochemistry of manganese porphyrins. Part 6. Oxidation–reduction equilibria of manganese(<scp>III</scp>) porphyrins in aqueous solution
作者:Nilton Carnieri、Anthony Harriman、George Porter
DOI:10.1039/dt9820000931
日期:——
Water-soluble manganese(III) porphyrins are oxidised in alkaline aqueous solution to the corresponding manganese(IV) porphyrins which, from magnetic moment measurements, appear to exist in solution as µ-oxo-dimers. Midpoint potentials and rate constants for oxidation of the manganese(III) porphyrins have been measured for a series of oxidants and throughout the range 9 < pH < 14, but the overall electronic
Photochemistry of manganese porphyrins. Part 4.—Photosensitised reduction of quinones
作者:Anthony Harriman、George Porter
DOI:10.1039/f29807601429
日期:——
between MnIII porphyrins and benzo-1,4-quinone, naphtho-1,4-quinone or anthra-9,10-quinone. However, upon irradiation with visible light, MnIII porphyrins sensitise reduction of the quinone to hydroquinone. Quantum yields (ca. 0.05) are dependent upon the quinone used, the pH of the solution and, to some extent, the nature of the porphyrin ligand. With benzo-1,4-quinone, the photoreaction involves an