Abstract
The photobleaching of compounds of the 5,10,15,20-tetrakis( m-hydroxyphenyl)porphyrin series at different reduction levels (m-THPP 1, m-THPC 2, m-THPBC 3) has been studied in methanol and in methanol–water (3:2, v/v) using an argon laser (514 nm) by observing the diminution of absorbance of band I (for 2 and 3) and of band IV (for 1) with time. Under the conditions studied here, true photobleaching only occurs for m-THPC ( 2) and m-THPBC ( 3), with photomodification being the major process for m-THPP ( 1). The rates for the photobleaching of 2 and 3 are presented in different solvents. The photobleaching rate of the bacteriochlorin 3 is found to be 90 times higher than that of the chlorin 2 in methanol–water (3:2, v/v). Singlet oxygen appears to be the reactive species responsible for the photobleaching of 2 and 3 and the photomodification of 1.
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 callMore From: Journal of Photochemistry & Photobiology, B: Biology
Disclaimer: 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.
