Abstract
Singlet and triplet excited state data on two new core-modified expanded porphyrins and their protonated derivatives are reported. Absorption spectral studies indicate a gradual red shift of the absorption bands upon sulfur substitution into the core. The singlet lifetimes for expanded S3-sapphyrin and S4-rubyrin decrease steadily relative to STPPH and S2TPP owing to a higher rate of intersystem crossing. Furthermore, the protonated derivatives of S3-sapphyrin and S4-rubyrin encapsulate fluoride ions into their cavities with binding constants of 807 and 48 M−1respectively. However, the triplet lifetime for S3-sapphyrin is longer (58.80 μs) than for normal thiaporphyrins (STPPH, 37.45 μs; S2TPP , 20.96 μs), suggesting that it could be very well suited for photosensitizing triplet oxygen.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
