The stability constants of inclusion complexes of some benzene derivations with β cyclodextrin (β CD) in aqueous solution were studied by ultraviolet spectrophotometry at 20℃,30℃,40℃ and 50℃,respectively.The app...The stability constants of inclusion complexes of some benzene derivations with β cyclodextrin (β CD) in aqueous solution were studied by ultraviolet spectrophotometry at 20℃,30℃,40℃ and 50℃,respectively.The apparent thermodynamic parameters were also obtained.The results demonstrated that van der Waals force (Δ H <0,Δ S <0,governed by Δ H ) is the major driving force of inclusion systems of benzene derivations with β CD.On the other hand,in the case of inclusion complex of vanillin,the hydrogen bonding may also play a role in complexation.展开更多
The inclusion complexes A?B and C of vanillin with β-cyclodextrin (β-CD) were prepared by means of changing preparation methods, such as medium and reducing temperature time. XRD results of inclusion complexes of β...The inclusion complexes A?B and C of vanillin with β-cyclodextrin (β-CD) were prepared by means of changing preparation methods, such as medium and reducing temperature time. XRD results of inclusion complexes of β-CD with vanillin indicated that among the crystals of three inclusion complexes, only A is of obvious channel-type packing strcture, and has specific peak at 1.2nm (about 7 degrees), with indicates formation inclusion complex.The reason is that the crystals of B and C must be mixed with some emptyβ-CD, according to change of medium or reducing temperature time,and this can be confirmed by DSC analysis.展开更多
文摘The stability constants of inclusion complexes of some benzene derivations with β cyclodextrin (β CD) in aqueous solution were studied by ultraviolet spectrophotometry at 20℃,30℃,40℃ and 50℃,respectively.The apparent thermodynamic parameters were also obtained.The results demonstrated that van der Waals force (Δ H <0,Δ S <0,governed by Δ H ) is the major driving force of inclusion systems of benzene derivations with β CD.On the other hand,in the case of inclusion complex of vanillin,the hydrogen bonding may also play a role in complexation.
文摘The inclusion complexes A?B and C of vanillin with β-cyclodextrin (β-CD) were prepared by means of changing preparation methods, such as medium and reducing temperature time. XRD results of inclusion complexes of β-CD with vanillin indicated that among the crystals of three inclusion complexes, only A is of obvious channel-type packing strcture, and has specific peak at 1.2nm (about 7 degrees), with indicates formation inclusion complex.The reason is that the crystals of B and C must be mixed with some emptyβ-CD, according to change of medium or reducing temperature time,and this can be confirmed by DSC analysis.
