Upon UV illumination the dye compounds display {TAIL ~ intense absorption} as well as {HEAD ~ visible fluorescence emission} 
Upon UV illumination the dye compounds display { TAIL ~ intense absorption } as well as { HEAD ~ visible fluorescence emission }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD