Spectroscopy and Photochemistry of meso-Diphenyltribenzonaphthoporphyrin at Low Temperatures: A Novel System for Hole-Burning Applications

We present a custom-tailored material for the application of spectral hole-burning in optical storage and imaging spectroscopy. The photoactive molecule meso-diphenyltribenzonaphthoporphyrin (P2TriBNP) combines the advantages of chlorins and simple porphyrins used so far, namely, the spectral separation between photoeduct and photoproduct states and a high photochemical hole-burning yield. Basic characteristics of the material were measured. We obtained the values of 3.2 ± 1.5% for the hole-burning yield, of ∼0.6 for the Debye−Waller factor in poly(vinyl butyral) (PVB), and a spectral separation between the educt and product absorption of 120 cm-1. The difference in the dipole moment between the ground and the excited state shows two contributions. The permanent dipole moment difference has a value of 0.29 ± 0.03 D. A root mean square value of 0.15 ± 0.02 D for a distributed, matrix-induced component was measured. Because of their high photochemical yields and the large absorption cross sections, P2TriBNP...