US EPA

4882615 

Journal Article 

Spectral, acid-base, and laser characteristics of 1,4-bis[beta-(2-quinolyl)vinyl]benzene (BQVB) 

Eldaly, SA; Alhazmy, SM; Ebeid, EM; Bhasikuttan, AC; Palit, DK; Sapre, AV; Mittal, JP 

1996 

1 

Journal of Physical Chemistry
ISSN: 0022-3654 

100 

23 

9732-9737 

10.1021/jp953083s 

WOS:A1996UP70600026 

The diolefinic dye BQVB is an efficient fluorescer with phi(i) values as high as 0.82, in n-heptane. The dye exhibits low values of the excited state lifetimes of ca. 0.4 ns. Both electronic absorption and fluorescence spectra are sensitive to medium acidity, and in acidic media a strong fluorescence is obtained at 500 nm. The laser activity of BQVB has been investigated. The dye solution in N,N-dimethylformamide (DMF) gives laser emission around 450 nm upon excitation by 337.1 nm nitrogen laser pulse. The excited state absorption S-2 <-- S-1 of BQVB has been measured using laser flash photolysis, and in DMF the S-2 <-- S-1 absorption occurs at ca. 762 nm. Energy transfer from BQVB to rhodamine 6G and to molecular oxygen has been studied. The quantum yields for the trans-cis photoisomerization (phi(c)) of BQVB in different organic solvents are also reported.