MOLECULAR FLUORESCENCE THERMOMETRY

Shifts in the wavelength of the fluorescence maximum and intensity in the blue tail of the fluorescence of BTBP [N,N'-bis(2,5-di- tert-butyl phenyl)-3,4,9,10-perylenedicarboximide] are shown to correlate with th e temperature of the fluid in which it is dissolved. These are used to measure temperature optically with a precision of better than +/-2 de grees C in both associated (methanol) and nonpolar (mineral oil) fluid s at concentrations as low as 10(-7) M.