The spectral behaviors of a series of coumarins in water with different concentrations of β cyclodextrin were studied in this work. It has been found that β cyclodextrin’s inclusion capacity to these coumarins is c...The spectral behaviors of a series of coumarins in water with different concentrations of β cyclodextrin were studied in this work. It has been found that β cyclodextrin’s inclusion capacity to these coumarins is closely related to their structural and substitution features. The influence of the polarity of the internal cavity of β cyclodextrin on coumarins’ spectra corresponds with the degree of coumarins’ intramolecular charge transfer. The formation of hydrogen bonds between -OH,-NH 2 substituted coumarin derivatives and β cyclodextrin acts as an obstacle to inclusion. Because the size of β cyclodextrin is definite, it is of great importance for good inclusion to take place that the size of the guest molecule match that of β cyclodextrin\;展开更多
文摘The spectral behaviors of a series of coumarins in water with different concentrations of β cyclodextrin were studied in this work. It has been found that β cyclodextrin’s inclusion capacity to these coumarins is closely related to their structural and substitution features. The influence of the polarity of the internal cavity of β cyclodextrin on coumarins’ spectra corresponds with the degree of coumarins’ intramolecular charge transfer. The formation of hydrogen bonds between -OH,-NH 2 substituted coumarin derivatives and β cyclodextrin acts as an obstacle to inclusion. Because the size of β cyclodextrin is definite, it is of great importance for good inclusion to take place that the size of the guest molecule match that of β cyclodextrin\;
