1. Transient absorption spectroscopy detection of sensitized delayed fluorescence in chiral benzophenone/naphthalene systems
- Author
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Miguel A. Miranda, Paula Bonancía, and M. Consuelo Jiménez
- Subjects
Exciplexes ,Energy ,Chemistry ,Phosphorescence ,Deactivation ,General Physics and Astronomy ,Molecules ,Spectra ,Photochemistry ,Fluorescence ,Triplet naphthalene derivatives ,Oxygen ,Microsecond ,chemistry.chemical_compound ,QUIMICA ORGANICA ,Excited state ,Ultrafast laser spectroscopy ,Benzophenone ,Flash photolysis ,Physical and Theoretical Chemistry ,Spectroscopy ,State - Abstract
Transient absorption spectroscopy has proven to be a powerful tool to investigate the formation and decay of excited singlet states upon triplet–triplet annihilation, following T–T energy transfer from a selectively excited sensitizer. Thus, upon selective excitation of benzophenone (BZP) by laser flash photolysis (LFP) at λ = 355 nm in the presence of naphthalene (NPT), a negative band centered at 340 nm has been detected, with growth and decay in the microsecond timescale. It has been assigned to the P-type NPT delayed-fluorescence. In the case of chiral BZP/NPT systems, stereodifferentiation has been observed in the kinetics of the involved photophysical processes, Financial support from the MICINN (Grant CTQ2010-14882 and predoctoral fellowship to P. B.) is gratefully acknowledged.
- Published
- 2011
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