Influence of Various Solvents on the Luminescent Performance of 1,8-Naphthalic Anhydride Modified by Eu3+ Ions.

Eu(3+)-modified 1,8-naphthalic anhydride (ENC) as a fluorescent tracer was successfully prepared, and then the effects of various solvents, including DMF, DMSO, CH3OH, C2H3N, and C3H6O, on the fluorescent performances of obtained ENC were investigated by means of Ultraviolet-visible absorption, Photoluminescence performances, Fourier transform infrared spectroscopy, Thermogravimetric analysis, and Time-resolved fluorescence measurements. The results showed that the inductive force strength derived from Eu3+ ion was gradually decreased with increasing polarity of used solvents as in order: C3H6O < C2H3N < DMF < CH3OH < DMSO, while the co-effects of various solvents involving hydrogen bonding were increased. Meanwhile, the influences of mentioned-above interactions on the luminescence features of resultant ENC were remarkable, which demonstrated the gradual decreasing of fluorescent intensity of characteristic peaks by accompany with obvious red-shifting of their emission wavelength. Furthermore, the fluorescence decay behaviors of ENC were elucidated, and therefore its luminescence mechanism was put forward.