Research Article

A Series of Imidazole Derivatives: Synthesis, Two-Photon Absorption, and Application for Bioimaging

Table 1

Photophysical properties of T-1, T-2, and T-3 in several of different polar solvents.

CompoundSolvent (nm)[a] (nm)[b] (ns)[d]Stokes’ shift (cm−1)[e]

T-1Benzene299, 3774.39, 4.554280.611.7110080, 3160
DCM296, 3754.37, 4.524580.672.2811949, 4832
Ethanol294, 3714.42, 4.564540.592.3311987, 4927
Ethyl acetate296, 3714.43, 4.544440.371.9711261, 4431
DMF297, 3744.37, 4.534660.592.5412210, 5278

T-2Benzene297, 3834.46, 4.464480.371.6611348, 3788
DCM296, 3894.47, 4.554990.281.8613743, 5666
Ethanol294, 3814.50, 4.644940.181.3713770, 6003
Ethyl acetate294, 3754.50, 4.564550.351.8412035, 4688
DMF296, 3804.51, 4.655050.232.1413981, 6513

T-3Benzene298, 3894.15, 4.194600.691.5311817, 3967
DCM295, 3934.18, 4.275090.421.9714251, 5798
Ethanol294, 3814.27, 4.404940.331.3713770, 6003
Ethyl acetate294, 3774.36, 4.454690.471.9212691, 5203
DMF296, 3814.16, 4.305050.452.2113981, 6444

position of the longest absorption band. [b]Peak position of SPEF, excited at the absorption maximum. [c]Quantum yields determined by using quinine sulfate as standard. [d]Fluorescent lifetime in different solutions. [e]Stokes’ shift in cm−1.