W. Wen-zhong
2011
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Journal
Chemical Reagents
Abstract
9H-Fluorene-9-carbaldehyde reacted upon corresponding aromatic amine derivatives to obtain two new Schiff base compounds containing fluorene,i.e.,N-((9H-fluoren-9-yl)methylene)-9H-fluoren-2-amine and N-((9H-fluoren-9-yl)methylene)-2-methylbenzenamine,which were characterized by NMR,IR,MS and UV-Vis spectra.The maximum absorption wavelength(λmax) of the two fluorine-containing Schiff base derivatives in ethanol,tetrahydrofuran,hexamethylene and chloroform,respectively,were separately determined by UV-Vis spectroscopy.The effects of the solvents and molecular structure on absorption spectra were studied.The results showed that the maximum absorption wavelength(λmax) of N-((9H-fluoren-9-yl) methylene)-9H-fluoren-2-amine on ultraviolet absorption spectra had a red shift with a larger conjugated system compared with that of N-((9H-fluoren-9-yl)methylene)-2-methylbenzenamine in tetrahydronfuran,hexamethylene or chloroform.Ultraviolet absorption wavelength(λmax) of N-((9H-fluoren-9-yl) methylene)-9H-fluoren-2-amine had a blue shift in contrast to that of N-((9H-fluoren-9-yl)methylene)-2-methylbenzenamine in ethanol,which demonstrated that the molecular conjugational effect of N-((9H-fluoren-9-yl) methylene)-9H-fluoren-2-amine had decreased in ethanol.