In this study,we present a supramolecular templating approach for constructing polyimidazolium salt containing crown ether and cyclobutane moieties.This strategy involves the formation of metal-carbene templates,photo...In this study,we present a supramolecular templating approach for constructing polyimidazolium salt containing crown ether and cyclobutane moieties.This strategy involves the formation of metal-carbene templates,photochemical cycloaddition,and subsequent demetallation of metal ions.Driven by the host-guest chemistry between crown ether units and ammonium salts,we successfully fabricated a supramolecular polymer SPN1,which features imidazolium receptors and cyclobutane units.The obtained SPN1 demonstrates outstanding reversible stimulus-response,antibacterial behavior and conductivity.展开更多
A n-conjugated phenylaza-15-crown-5-triazol-substituted coumarin fluoroionophore 1 was synthesized by cop- per（I）-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition （CuAAC ＂click＂ reaction）. 1 can display ...A n-conjugated phenylaza-15-crown-5-triazol-substituted coumarin fluoroionophore 1 was synthesized by cop- per（I）-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition （CuAAC ＂click＂ reaction）. 1 can display selective fluorescence enhancement toward Fe3＋ over Hg2＋, Cr3＋ and the other metal ions in aqueous solution. In sharp con- trast, the fluorescence behavior between Fe3＋ and Hg2＋ is completely reversed in EtOH. That is, Hg2＋ gives the largest fluorescence enhancement over Cr3＋, Fe3＋ and the other metal ions.展开更多
An idea on interfacial equilibrium-potential differences () which are generated for the extraction of univalent metal picrate (MPic) and divalent ones (MPic2) by crown ethers (L) into high-polar diluents was improved....An idea on interfacial equilibrium-potential differences () which are generated for the extraction of univalent metal picrate (MPic) and divalent ones (MPic2) by crown ethers (L) into high-polar diluents was improved. These potentials were clarified with some experimental extraction-data reported before on the M = Ag(I), Ca(II), Sr(II) and Ba(II) extraction with 18-crown-6 ether (18C6) and benzo-18C6 into 1,2-dichloroethane (DCE) and nitrobenzene (NB). Consequently, it was demonstrated that the? values from the extraction-experimentally obtained logKD,Pic ones are in agreement with or close to those calculated from charge balance equations in many cases, where the symbol, KD,Pic, denotes an individual distribution constant of Pic﹣ into the DCE or NB phase. Also, it was experimentally shown that extraction constants based on the overall extraction equilibria do not virtually contain the? terms in their functional expressions.展开更多
The patient was a 41-year-old woman experiencing severe lumbago for several years. The physician-in-charge referred her for dental treatment because examination did not reveal any specific abnormality in her lower bac...The patient was a 41-year-old woman experiencing severe lumbago for several years. The physician-in-charge referred her for dental treatment because examination did not reveal any specific abnormality in her lower back. Prior to the treatment, the patient could barely bend forward and backward because of serious back pain. Her body flexibility and lower back pain improved when a gold alloy cast crown was placed near her feet. However, when the crown was covered with aluminum foil, it was again very difficult for her to bend her body forward and backward. These results suggested that her body reacted positively because good electromagnetic waves emitted by the crown were absorbed by the body. The alloy used to make the crown was chosen using the Bi-Digital O-Ring Test. Moreover, the shape, contact strength, and occlusion (biting condition) of the crown were also determined by the Bi-Digital O-Ring Test. After the crown was placed on her upper right first molar, her lumbago completely disappeared and did not recur for >5 years of follow-up. The effectiveness of electromagnetic waves on the condition of the body, as in this case, has not often been acknowledged in modern medicine, and the underlying mechanism remains unclear;therefore, further research is required.展开更多
基金supported by the National Natural Science Fund for Distinguished Young Scholars of China(22025107)Shaanxi Fundamental Science Research Project for Chemistry&Biology(22JHZ003)+2 种基金the National Youth Top-notch Talent Support Program of ChinaXi’an Key Laboratory of Functional Supramolecular Structure and Materialsthe FM&EM International Joint Laboratory of Northwest University。
文摘In this study,we present a supramolecular templating approach for constructing polyimidazolium salt containing crown ether and cyclobutane moieties.This strategy involves the formation of metal-carbene templates,photochemical cycloaddition,and subsequent demetallation of metal ions.Driven by the host-guest chemistry between crown ether units and ammonium salts,we successfully fabricated a supramolecular polymer SPN1,which features imidazolium receptors and cyclobutane units.The obtained SPN1 demonstrates outstanding reversible stimulus-response,antibacterial behavior and conductivity.
文摘A n-conjugated phenylaza-15-crown-5-triazol-substituted coumarin fluoroionophore 1 was synthesized by cop- per（I）-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition （CuAAC ＂click＂ reaction）. 1 can display selective fluorescence enhancement toward Fe3＋ over Hg2＋, Cr3＋ and the other metal ions in aqueous solution. In sharp con- trast, the fluorescence behavior between Fe3＋ and Hg2＋ is completely reversed in EtOH. That is, Hg2＋ gives the largest fluorescence enhancement over Cr3＋, Fe3＋ and the other metal ions.
文摘An idea on interfacial equilibrium-potential differences () which are generated for the extraction of univalent metal picrate (MPic) and divalent ones (MPic2) by crown ethers (L) into high-polar diluents was improved. These potentials were clarified with some experimental extraction-data reported before on the M = Ag(I), Ca(II), Sr(II) and Ba(II) extraction with 18-crown-6 ether (18C6) and benzo-18C6 into 1,2-dichloroethane (DCE) and nitrobenzene (NB). Consequently, it was demonstrated that the? values from the extraction-experimentally obtained logKD,Pic ones are in agreement with or close to those calculated from charge balance equations in many cases, where the symbol, KD,Pic, denotes an individual distribution constant of Pic﹣ into the DCE or NB phase. Also, it was experimentally shown that extraction constants based on the overall extraction equilibria do not virtually contain the? terms in their functional expressions.
文摘The patient was a 41-year-old woman experiencing severe lumbago for several years. The physician-in-charge referred her for dental treatment because examination did not reveal any specific abnormality in her lower back. Prior to the treatment, the patient could barely bend forward and backward because of serious back pain. Her body flexibility and lower back pain improved when a gold alloy cast crown was placed near her feet. However, when the crown was covered with aluminum foil, it was again very difficult for her to bend her body forward and backward. These results suggested that her body reacted positively because good electromagnetic waves emitted by the crown were absorbed by the body. The alloy used to make the crown was chosen using the Bi-Digital O-Ring Test. Moreover, the shape, contact strength, and occlusion (biting condition) of the crown were also determined by the Bi-Digital O-Ring Test. After the crown was placed on her upper right first molar, her lumbago completely disappeared and did not recur for >5 years of follow-up. The effectiveness of electromagnetic waves on the condition of the body, as in this case, has not often been acknowledged in modern medicine, and the underlying mechanism remains unclear;therefore, further research is required.
