Abstract
Perylene diimide derivatives were used as probes to investigate the effect of the molecular structures on the fluorescence quenching mechanism in a perylene diimide/graphene oxide system. The electrons transferred from the excited state of dyes to the conductive band of graphene oxide with different concentrations were determined by fluorescence spectra. The results indicated that the quenching efficiency of perylene diimides by graphene oxide was not only dependent on the difference between the lowest unoccupied molecular orbital level of dyes and the conduction band of the graphene oxide, but also mainly on the difference in the molecular structures.
Highlights
Graphene oxide (GO) has been widely used in DNA detection and other analytes, such as Ag+, ATP, etc. [1,2,3]
SFPDI, dipentafluoro-phenoxyl0 perylene diimide (DFPDI), SBrPDI, dibromo-perylene diimide (DBrPDI) were prepared by our group (Molecular structures are shown in Figure 6) [13]
The fluorescence quenching mechanism was ascribed to the electron transfer from the excited state of the dyes to the conductive band of GO
Summary
Graphene oxide (GO) has been widely used in DNA detection and other analytes, such as Ag+ , ATP, etc. [1,2,3]. The molecular structure of the analyzed target determines its sensitivity [5,6]. Significant spectral changes in the absorption of TAIPDI-GO and emission quenching indicate π–π interactions between the π-surfaces of perylene diimide (PDI). Our groups have recently synthesized a series of perylene diimide derivatives, which possessed only slight differences in molecular structures and energy levels [13]. This provided sufficient resources for us to investigate the influence of molecular structure on the fluorescence quenching mechanism of perylene diimide derivatives by GO. PDIsofand fluorescence quenchingband mechanism between the molecular structures of PDIs and its fluorescence quenching mechanism was investigated
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