A Singlet Oxygen Photogeneration and Luminescence Study of Unsymmetrically Substituted Mesoporphyrinic Compounds

Table 2

Fluorescence lifetime, 𝜏_S, for the series of unsymmetrically substituted mesoporphyrin compounds in benzene and in the presence of oxygen (air equilibrated samples) and in the absence of oxygen (argon purged samples).

Compound	𝜏S (ns)		𝑘s
	With O2	Without O2	(mol^−1s^−1)×10^−9
	(air equilibrated)	(argon purged)
TPP	9.7	10.8	10.9
TPPOHO	9.4	9.8	5.4
TPPOHM	9.5	10.5	10.2
TPPOHP	9.8	10.6	7.3
TBP	9.6	9.8	2.0
TBPOHO	9.3	9.4	0.5