The nature of the quenching of barbiturate fluorescence by forming inclusion complexcs with β-cyclodextrin is investigated principally using fluorescence/absorption and Fourier transform infrared(FTIR)spectroscopy.Th...The nature of the quenching of barbiturate fluorescence by forming inclusion complexcs with β-cyclodextrin is investigated principally using fluorescence/absorption and Fourier transform infrared(FTIR)spectroscopy.The relatively weak complexes formed in aqueous solutions indicated through the IR spectroscopies are confirmed by the apparent formation constants acquired by using fluorescence method.Further specific information concerning the mechanisms of interaction has been ex- plored in detail by means of the analysis of the electrochemical and spectroscopic behaviour.展开更多
The knoevenagel condensation reaction of barbituric acid and aromatic aldehyde under ground and heated in solventless system was described. The reaction mechanism was also proposed. The structures of the products were...The knoevenagel condensation reaction of barbituric acid and aromatic aldehyde under ground and heated in solventless system was described. The reaction mechanism was also proposed. The structures of the products were identified by IR, 1H NMR, 13 C NMR and UV. 5 Alkylidene barbituric acid was the only product in the two reaction systems.展开更多
Hollow supramolecular nanotubes have been fabricated by the self assembling of 5 (4 N methyl N tetradecyl aminobenzylidene) 2,4,6 (1H,3H) pyrimidinetrione(AB 1,14 ) and 4 amino 2, 6 didodecylamino 1,3,5 triazine (M 12...Hollow supramolecular nanotubes have been fabricated by the self assembling of 5 (4 N methyl N tetradecyl aminobenzylidene) 2,4,6 (1H,3H) pyrimidinetrione(AB 1,14 ) and 4 amino 2, 6 didodecylamino 1,3,5 triazine (M 12 ) in non hydrous chloroform. The nanotubes are 7 nm in diameter and about hundreds of nanometer in length. Their formation was realized by π π aromatic stacking of the hexamers, which resulted from the interaction of three complementary hydrogen bonds between AB 1,14 and M 12 . X ray diffraction pattern indicated that the distance between the hexamers is 0 49 nm.展开更多
ionic liquids 1-n-buty1-3-methylimmidazolium tetrafluoroborate(BF4),l-n-buty1-3methylimmidazolium bromid(Br)and l-n-buty1-3-methylimmidazoliumhexafluorophosphate(PF6)were adopted as the microwave absorbent.Under the r...ionic liquids 1-n-buty1-3-methylimmidazolium tetrafluoroborate(BF4),l-n-buty1-3methylimmidazolium bromid(Br)and l-n-buty1-3-methylimmidazoliumhexafluorophosphate(PF6)were adopted as the microwave absorbent.Under the radiation of the microwave,the condensation reaction between benzaldehyde and barbituric acid was promoted,the yields wasmuch higher than the same reaction without ionic liquids.the catalytic activity of different ionic liquid,and the reaction time and the power of the microwave to the reaction was studied.As the microwaveabsorbent,BF4could well promote the condensation reaction between other aromatic aldehydes and barbituric acid as well.The structures of the product,5-alkylene barbituric acid,and its derivation were testified through by 1HNMR.展开更多
文摘The nature of the quenching of barbiturate fluorescence by forming inclusion complexcs with β-cyclodextrin is investigated principally using fluorescence/absorption and Fourier transform infrared(FTIR)spectroscopy.The relatively weak complexes formed in aqueous solutions indicated through the IR spectroscopies are confirmed by the apparent formation constants acquired by using fluorescence method.Further specific information concerning the mechanisms of interaction has been ex- plored in detail by means of the analysis of the electrochemical and spectroscopic behaviour.
文摘The knoevenagel condensation reaction of barbituric acid and aromatic aldehyde under ground and heated in solventless system was described. The reaction mechanism was also proposed. The structures of the products were identified by IR, 1H NMR, 13 C NMR and UV. 5 Alkylidene barbituric acid was the only product in the two reaction systems.
文摘Hollow supramolecular nanotubes have been fabricated by the self assembling of 5 (4 N methyl N tetradecyl aminobenzylidene) 2,4,6 (1H,3H) pyrimidinetrione(AB 1,14 ) and 4 amino 2, 6 didodecylamino 1,3,5 triazine (M 12 ) in non hydrous chloroform. The nanotubes are 7 nm in diameter and about hundreds of nanometer in length. Their formation was realized by π π aromatic stacking of the hexamers, which resulted from the interaction of three complementary hydrogen bonds between AB 1,14 and M 12 . X ray diffraction pattern indicated that the distance between the hexamers is 0 49 nm.
文摘ionic liquids 1-n-buty1-3-methylimmidazolium tetrafluoroborate(BF4),l-n-buty1-3methylimmidazolium bromid(Br)and l-n-buty1-3-methylimmidazoliumhexafluorophosphate(PF6)were adopted as the microwave absorbent.Under the radiation of the microwave,the condensation reaction between benzaldehyde and barbituric acid was promoted,the yields wasmuch higher than the same reaction without ionic liquids.the catalytic activity of different ionic liquid,and the reaction time and the power of the microwave to the reaction was studied.As the microwaveabsorbent,BF4could well promote the condensation reaction between other aromatic aldehydes and barbituric acid as well.The structures of the product,5-alkylene barbituric acid,and its derivation were testified through by 1HNMR.
