Abstract
A detailed spectroscopic
study of zinc tetrabenzporphyrin in n-octane reveals
the following: (i) the relative magnitude
of solute-solvent interaction in the ground and excited states increases in the
order T1 < S0 < S1 < S2. (ii) The potential energy
surface minima of the ground and excited states are very similar within the
framework of the Franck-Condon principle. (iii) The absence of any
hot-band emission from the Q band (S1) and any emission from the Soret band (S2) indicates that significant
amounts of energy degrade to the lowest vibrational level of S1. (iv) An earlier report on
monomer phosphorescence is mainly due to aggregation. Selective narrow-band
excitation is shown to be a useful technique to unravel complex spectra of
porphyrins in Shpolskii-type matrices. Accurate
measurements can be made of the energies for electronic transitions between the
ground and excited states of molecules isolated in the various sites of the
host matrix. The intensity ratios for electronic and vibronic
bands can also be determined.
Cited by
21 articles.
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