We report laser excitation-time-resolved EPR spectroscopy on the transient triplet magnetization of covalently linked hybrid porphyrin dimers, Zn(-CH2-)nH2, oriented in a uni-axial liquid crystal at 100 K. Three dimers are investigated: for n = 3, the para-para and ortho-ortho, and for n = 6, the ortho-ortho. Selective singlet excitation of the dimer components reveals intramolecular singlet energy transfer rates, ket = 1.5 × 109 s−1 for both the ortho-ortho compounds, and 4.7 × 108 s−1 for the para-para compound.
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Regev et al. (1986) studied this question.