Photo-physical properties of 5,10,15-tri-n-pentyl-20-(1′,1′,3′,3′- tetramethylisoindolin-2′-yloxyl-5′-yl)porphyrinato zinc(II), 1, have been investigated using time-resolved EPR (TREPR) and transient absorption measurements. A formation of the excited doublet (D 1 ) and quartet (Q 1 ) states constituted by excited triplet zinc porphyrin (ZnP) and doublet nitroxide is confirmed by TREPR. This is the first D 1 and Q 1 observation in a system where the nitroxide is directly substituted to a porphyrin ligand. Compound 1 exhibits the longest lifetime of any nitroxide-porphyrin systems in the lowest excited state, indicating a relatively weak electron exchange interaction between triplet ZnP and doublet nitroxide.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry