CCVJ's fluorescence lifetime as a viscosity measurement tool and its possible application as a tunable picoseconds reference lifetime standard

tool and its possible application as a tunable picoseconds reference lifetime standard Sasson Haviv Dr. Mark Haidekker, Thesis Supervisor ABSTRACT 9-(2-carboxy-2-cyanovinyl) julolidine (CCVJ, a molecular rotor) was shown to perform as a viscosity sensitive probe. Using steady state spectroscopy, CCVJ was shown to have decreased emission intensity as the environmental viscosity decreased. The major disadvantage of this method is errors arising from concentration inaccuracies. A potential solution to this problem is to use time resolved spectroscopy to measure the fluorescence lifetime of CCVJ as a function of its environment’s viscosity (the measured fluorescent lifetime is independent of concentration). Time resolved studies revealed that CCVJ exhibits a single exponential decay v τ which decreases with lower viscosity. A power law model