Abstract
The fluorescence efficiencies of (
Φ
f) of 1,4-bis[β-(2-benzonazolyl) vinyl]benzene (BBVB) havebeen measured in various hydrogen bonding and non-hydrogen bonding solvents of different polarities on the
π
∗
scale. In hydrogen bonding solvents
Φ
f increases with increasing
π
∗
value. The fluorescence has also been studied in other media, including micellar, microemulsion and acidic ones. BBVB solutions exhibit short excited state lifetimes in the range 0.5–0.7 ns.
The second-order rate constant of oxygen and rhodamine 6G (R6G) quenching of BBVB fluorescence have been determined from Stern-Volmer relations. The critical transfer distances for the BBVB/R6G system have been determined as
R
0 = 46.8
and 48.5
A
̊
in ethanol and methanol respectively. The photochemical quantum yields (
Φ
c) have also been determined in various organic solvents.