Synthesis of naphthalimide derivatives and its recognition of Fe3

: A novel naphthalimide derivatives N-hexyl-4-benzylamino-naphthalimide(HBN) was synthesized from 4-bromo-1, 8-naphthalic anhydride, and the structure was characterized by NMR and MS. Spectral properties of HBN for recognition of Fe3+ were investigated by fluorescence spectrum. In a certain range of Fe3+ from 4 x 10(-7) to 1 x 10(-2) mol x L(-1), the fluorescence intensity of HBN significantly reduced with increasing concentration of Fe3+ in ethanol/water (1:1, volume ratio). The equation of linear regression was F0/F=623.253 2c(Fe3+) + 0.9642 (R2 = 0.9963). Moreover, no obvious interference with the detection of the Fe3+ ion was observed in the presence of the common metal ions such as Ca2+, Na+, CU2+, Zn2+, Pb2+, Co2+, Ni2+, Mn2+ and Fe2+, which indicated that HBN displayed excellent selectivity and high sensitivity for the detection of Fe3+.