94317-94-9Relevant articles and documents
Oxidation products of VO(T(m-NO2)PP): EPR and cyclic voltammetric studies
Singh, A. Tomba,Lemtur
, p. 1549 - 1556 (2003)
The EPR study of VO(T(m-NO2)PP)+ at 77 K is reported. A triplet state spectrum of VO(T(m-NO2)PP)+ at 77 K is obtained. The ZFS parameters are obtained from the computer simulation. An inter-electron distance of
Synthesis of chiral porphyrins and their use in photochemical oxidation of carbonyl compounds
Walaszek, Dominika J.,Maximova, Ksenia,Rybicka-Jasińska, Katarzyna,Lipke, Agnieszka,Gryko, Dorota
, p. 493 - 505 (2014/07/21)
A series of chiral A4, A2B2, and AB 3 porphyrins bearing proline moieties at the meso-phenyl group has been synthesized. Photostability studies revealed that the number of L-proline units and their position on meso-phenyl rings strongly influence the decomposition rate of the catalyst. 5,10,15-Tris(mesityl)-20-(3- prolinanilidylphenyl)-21,23H-porphyrin is the most stable while porphyrin bearing four 3-prolinanilidylphenyl substituents completely decomposes in CHCl3 within 3 h. Singlet oxygen quantum yields of the conjugates were determined by measuring the peak areas of the NIR emission of 1O2 (1280 nm) generated by these compounds and compared to that generated by the reference standard TPP. Selected porphyrins were tested as catalysts in the photooxidation of carbonyl compounds at the α-position.
Effects of substituents on the photophysical properties of symmetrical porphyrins
Ormond, Alexandra B.,Freeman, Harold S.
, p. 440 - 448 (2013/02/23)
Porphyrin compounds having groups that mimic the phenolic moiety of m- and p-isomers of 5,10,15,20-tetrakis(hydroxyphenyl) porphyrin (THPP) have been synthesized along with 5,10,15,20-tetrakis(heteroaryl) porphyrins bearing 2-thienyl and 5-thiazolyl groups. Absorption and fluorescence spectroscopy, including fluorescence lifetime (τf) and quantum yield (Φf) measurements, were employed to characterize the singlet excited state of all compounds, using 5,10,15,20-tetraphenylporphyrin (H 2TPP) as a standard (Φf = 0.12 in DMF). The generation of singlet oxygen by each porphyrin photosensitizer was measured as the singlet oxygen quantum yield (ΦΔ), using H2TPP as a standard (ΦΔ = 0.64 in DMF). Partition coefficients were determined using 2-octanol as the organic phase and PBS solution as the aqueous phase. Fluorescence quantum yields ranged from 0.01 to 0.18 for all compounds, with heteroaryl porphyrins having the lowest values. Singlet oxygen quantum yields ranged from 0.40 to 0.65, with heteroaryl porphyrins having the highest values, showing them to be better sensitizers than m- and p-THPP. Log P values were all >1 showing higher solubility in the 2-octanol layer.
