Title
Investigation on the chirality mechanism of chiral carbon quantum dots derived from tryptophan
Author
Yingying Wei, Lin Chen, Junli Wang, Xuguang Liu, Yongzhen Yang, Shiping Yu
Year
2019
Journal
RSC Advances
Abstract
Chiral carbon quantum dots (CQDs) with chirality, fluorescence and biocompatibility were synthesized by a one-step method with L-/D-tryptophan (L-/D-Trp), as both carbon source and chiral source. Levogyration-/dextrorotation-CQDs (L-/D-CQDs) were characterized by transmission electron microscopy, Fourier transform infrared spectrometry, ultraviolet-visible absorption, excitation and emission spectrometry and circular dichroism (CD) spectrometry. Results show that L-CQDs and D-CQDs present similar spherical morphology, functional groups and optical properties. The CD signal, around 220, 240 and 290 nm are opposite and symmetric, which conclusively demonstrates that L-CQDs and D-CQDs are enantiomers. Besides the CD signal around 220 nm from the inheritance of L-/D-Trp, two new chiral signals around 240 and 290 nm were induced by chiral environment.
Instrument
J-1500
Keywords
Circular dichroism, Stereochemistry, Materials