Influence of Viscosity and Temperature on Rotational Dynamics of 3-(1H-benzo[d]Imidazol-2-yl)-7-(Diethyl Amino)-2H-chromen-2-one (Polar Laser dye) in Highly Viscous Solvent: Low and High Viscous Range.

Temperature-dependent rotational dynamics of 3-(1 H-benzo[d]imidazol-2-yl)-7-(diethyl amino)-2 H-chromen-2-one (3HBI-7D-2HChromen-2-one) has been studied in highly viscous glycerol solvent. Over the entire studied temperature range rotational reorientation time values vary linearly with temperature. Experimental obtained rotational results are analyzed using hydrodynamic and quasi-hydrodynamic models over the entire temperature range as well as low and high viscous range. 3HBI-7D-2HChromen-2-one rotational dynamics has been described using Stoke's-Einstein-Debye (SED) slip boundary conditions.