Abstract

Fluorescence emission spectra are reported for benzo[b]naphtho[2,3d]furan, dinaphtho[1,2b:1',2'd]furan, dinaphtho[2,1b:1',2'd]furan, dibenzo[2,3:10,11]perylo[1,12bcd[furan, dibenzo[2,3:10,11]perylo[1,12bcd]thiophene, naphtho[1,8bc:5,4b'c']dipyran (also called 1,6-dioxapyrene), and naphtho[1,8bc:5,4b'c']dipyran (also called 1,6-dioxapyrene) in organic nonelectrolyte solvents of varying polarity. Results of these measurements indicate that dinaphtho[1,2b:1',2'd]furan exhibits slight signs of probe character as evidenced by changing emission intensity ratios; however, the dynamic range was much too small to classify this molecule as a polycyclic aromatic compound probe. The effect of nitromethane and 1,2,4-trimethoxybenzene as selective quenching agents was also examined. Nitromethane was found to quench fluorescence emission of all the aforementioned compounds except benzo-[b]naphtho[2,3d]furan.

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