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

Roland Bonneau | Zendy; B. Herran | Zendy

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

Author(s) -

Roland Bonneau,

B. Herran

Publication year - 1983

Publication title -

laser chemistry

Language(s) - English

Resource type - Journals

eISSN - 1026-8014

pISSN - 0278-6273

DOI - 10.1155/lc.4.151

Subject(s) - flash photolysis , chemistry , photochemistry , triplet state , quenching (fluorescence) , styrene , molecule , perpendicular , moiety , nanosecond , double bond , reaction rate constant , laser , fluorescence , stereochemistry , kinetics , polymer chemistry , organic chemistry , optics , physics , geometry , mathematics , quantum mechanics , copolymer , polymer

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.

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