Photophysical Properties of Diphenylacetylene and Diphenylbutadiyne Derivatives in Solution Phase

• Authors: Y. Hirata , T. Okada , T. Nomoto
• Languages of publication: EN

Abstracts

EN

By using the femtosecond and picosecond transient absorption measurement techniques, we have investigated diphenylacetylene, diphenylbutadiyne, and their methoxy and cyano derivatives in the solution phase. Both the rapid S_{2} → S_{1} internal conversion in the subpicosecond time scale and the triplet formation in the tens of picosecond region were observed for diphenylbutadiyne and its methoxy derivatives, while the dynamic behavior of dimethoxy-diphenylacetylene was quite similar to that of diphenyl acetylene. The level inversion of the lowest excited singlet states of dicyano-diphenylbutadiyne was observed. The thermally activated S_{2} ← S_{1} internal conversion was not negligible and the sum of the rate constants of S_{2} → S_{1} and S_{2} ← S_{1} internal conversions was estimated to be about 5 × 10^{11} s^{-1} at room temperature.

Keywords

EN

31.70.Hq; 78.47.+p

Discipline

• 31.70.Hq: Time-dependent phenomena: excitation and relaxation processes, and reaction rates(for chemical kinetics aspects, see 82.20.Rp)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 94
• Issue: 4
• Pages: 627-636

Dates

published

1998-10

received

1998-07-23

Contributors

author

Y. Hirata

• Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan

author

T. Okada

• Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
• Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka 560-8531, Japan

author

T. Nomoto

• Department of Chemistry, Faculty of Education, Mie University, Tsu 514-0008, Japan

Identifiers

DOI

10.12693/APhysPolA.94.627