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- W2034942034 endingPage "5762" @default.
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- W2034942034 abstract "Abstract Modified porphyrins : New, mild conditions are described for the conversion of free‐base octaethylporphyrin (OEP) into the corresponding monooxypyriporphyrin. The same conditions can be used to convert the monooxypyriporphyrin into the unprecedented bis(oxypyri)porphyrin (see figure). magnified image Free‐base octaethylporphyrin (OEP) was converted in two steps (β,β′‐dihydroxylation and oxidative diol cleavage with concomitant aldol condensation) to the corresponding oxypyriporphyrin. This conversion was previously described to be applicable only to the Ni II complex of OEP. Modified diol cleavage conditions made this reaction sequence now applicable to free‐base OEP. The single‐crystal structure of the resulting free‐base oxypyriporphyrin was determined, proving its near‐perfect planarity. The reaction sequence can also be applied to oxypyriporphyrin itself, generating the unprecedented bacteriochlorin‐type bis(oxypyri)porphyrin as two separable isomers. The ground‐state (UV/Vis and fluorescence spectroscopies) and excited‐state (transient triplet–triplet absorption, triplet lifetimes, and triplet EPR spectroscopy) photophysical properties of all chromophores are compared with those of OEP, chlorins, and oxochlorins. The pyridone‐modified porphyrins possess unique spectroscopic signatures that distinguish them from regular porphyrins or chlorins. The presence of the pyridone moiety alters the ESI + collision‐induced fragmentation properties of these oxypyriporphyrins only to a minor degree when compared with those of OEP or chlorins, confirming their stability." @default.
- W2034942034 created "2016-06-24" @default.
- W2034942034 creator A5017683550 @default.
- W2034942034 creator A5025944326 @default.
- W2034942034 creator A5050340439 @default.
- W2034942034 creator A5061217120 @default.
- W2034942034 creator A5077135052 @default.
- W2034942034 creator A5080580467 @default.
- W2034942034 creator A5089718436 @default.
- W2034942034 date "2009-05-26" @default.
- W2034942034 modified "2023-10-07" @default.
- W2034942034 title "Stepwise Conversion of Two Pyrrole Moieties of Octaethylporphyrin to Pyridin‐3‐ones: Synthesis, Mass Spectral, and Photophysical Properties of Mono and Bis(oxypyri)porphyrins" @default.
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