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The triplet state of a series of compounds, each containing the styrene moiety, hasbeen studied by nanosecond laser flash photolysis. The lifetimes, the TT absorptionspectra and the rate constants for deactivation by several quenchers have been determined.It is shown from these results that, in the triplet state of styrene derivatives intheir lowest energy conformation, the double bond is twisted by 90° for flexiblemolecules (perpendicular triplet) or by an angle as large as allowed by the molecularframework of rigid molecules (twisted triplet). There is no equilibrium between planarand perpendicular (or twisted) triplets, in contrast with the case of stilbene. Theinfluence of substituants on the lifetime of the perpendicular triplet and the mechanismof quenching of this species by oxygen have been investigated.

Structure and Properties of the Triplet State of Styrene Derivatives Studied by Laser-Flash-Photolysis