Document details

(More) About biphenyl first excited triplet state energy

Author(s): Gomes, Paulo J. S. ; Serpa, Carlos ; Arnaut, Luís G.

Date: 2006

Persistent ID: https://hdl.handle.net/10316/5068

Origin: Estudo Geral - Universidade de Coimbra

Subject(s): Photoacoustic calorimetry; Triplet energy; Biphenyl; Energy transfer


Description

Biphenyl photophysics was extensively studied in the past and much attention was given to the measurement of its first excited triplet state energy. Phosphorescence and the corresponding T1 <-- S0 absorption give triplet energies that differ by 10 kcal mol-1. We revisited biphenyl photophysics using photoacoustic calorimetry (PAC), a technique that directly measures the thermochemistry and kinetics of short-lived transients in solution. PAC measurements give the relaxed biphenyl triplet energy of 67.8 ± 0.6 kcal mol-1; 2.3 kcal mol-1 higher than the spectroscopic value. The direct measurement of the biphenyl relaxed triplet energy reported in this work should resolve the continued misuse of its spectroscopic energy, in particular in the growing field of polyphenylene polymers.

http://www.sciencedirect.com/science/article/B6TGY-4JTXCSD-B/1/ca745f27500ae8609414c7d3a5d2e5dd

Document Type Journal article
Language English
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