Concerning the Triplet Energies of Non-metallated Phthalocyanines and the Mechanism of Singlet Oxygen (1 D g) - sensitized Phthalocyanine Luminescence D. M. Baigel, A. A. Gorman,* I. Hamblett and T. J. Hill Department of Chemistry, University of Manchester, Manchester M13 9PL, U. K. Abstract: Establishment of equilibria for triplet energy transfer between singlet oxygen (1 D g), and both 2,3,9,10,16,17, 23,24-octahexadecyl- phthalocyanine (OHPC) and tetra-t-butylphthalocyanine (TBPC) (a) demonstrates that the identical triplet energies of these non-metallated phthalocyanines, 22.8 ± 0.2 kcal mol-1, are very significantly less than hitherto thought and (b) provides strong support for a mechanism of 1 D g - sensitized phthalocyanine luminescence which involves triplet energy transfer fom 1 D g to the phthalocyanine triplet, these two species being the electronically excited components of a triplet energy transfer equilibrium.

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