Cyclodextrins(CDs)—a class of cyclic oligomers of glucopyranosyl units featuring hydrophilic rims and hydrophobic cavities—have captured the imagination of scientists for over a century.Among all naturally occurring...Cyclodextrins(CDs)—a class of cyclic oligomers of glucopyranosyl units featuring hydrophilic rims and hydrophobic cavities—have captured the imagination of scientists for over a century.Among all naturally occurring and wholly synthetic macrocycles,CDs have established their credentials as phenomenal compounds that have made vital scientific and technological impacts on a variety of disciplines,such as the chemical,materials,environmental,biological,food,cosmetic,and medical sciences.In this minireview,we look back upon the Stoddart group’s 56-year journey of adventure and achievements in relation to CDs.Advances we have made in the chemical syntheses of CD derivatives,analogues,and enantiomers are summarized.The integration of CDs and their derivatives as nanoscale building blocks for the(non)covalent functionalization of surfaces,nanotubes,and polymers,as well as in the construction and applications of chemically modified molecules and supermolecules—for example,CD-based second-sphere coordination complexes,CD metal–organic frameworks,and CD-based mechanically interlocked molecules—are presented.Our exploration in CD science and technology highlights the versatility of CDs in both fundamental and applied sciences,suggesting that there is still ample room for future discoveries.展开更多
The anion coordination complex,[ClPt(bpt)4]Cl(bpt=N,N'-bis(3-pyridylmethyl)-2-thiourea),was synthesized and studied by X-ray crystal structure analysis,NMR and FAB mass spectra.In the solid state,the Pt(bpt)4 anio...The anion coordination complex,[ClPt(bpt)4]Cl(bpt=N,N'-bis(3-pyridylmethyl)-2-thiourea),was synthesized and studied by X-ray crystal structure analysis,NMR and FAB mass spectra.In the solid state,the Pt(bpt)4 anion receptor adopts a cone conformation to bind the chloride anion through hydrogen bonds and electrostatic interaction in which the four branches of the thiourea ligands bind the chloride anion to form N-H…Cl-hydrogen bonds(3.49-3.81).The entraped chloride anion is situated above the Pt(Ⅱ)center at 3.52.Further second-sphere coordination assemby from the Pt(bpt)4 core with 8 zinc(Ⅱ)tetraphenylporphyrins(ZnPr)is discussed.展开更多
晶体球法是近年来在国际上发展起来的一种测量非线性系数的新方法。根据聚焦高斯光束二次谐波产生的孔径方程理论 ,分析了晶体球中的第 类非相位匹配二次谐波产生过程 ,讨论了晶体球中第 类非相位匹配二次谐波最佳聚焦参数的选择。报...晶体球法是近年来在国际上发展起来的一种测量非线性系数的新方法。根据聚焦高斯光束二次谐波产生的孔径方程理论 ,分析了晶体球中的第 类非相位匹配二次谐波产生过程 ,讨论了晶体球中第 类非相位匹配二次谐波最佳聚焦参数的选择。报道了 L i Nb O3晶体球中皮秒激光脉冲抽运的非相位匹配二次谐波实验。展开更多
In Euclidean geometry, for a real submanifold M in E n+a , M is a piece of E n if and only if its second fundamental form is identically zero. In projective geometry, for a complex submanifold M in CP n+a , M is a pie...In Euclidean geometry, for a real submanifold M in E n+a , M is a piece of E n if and only if its second fundamental form is identically zero. In projective geometry, for a complex submanifold M in CP n+a , M is a piece of CP n if and only if its projective second fundamental form is identically zero. In CR geometry, we prove the CR analogue of this fact in this paper.展开更多
基金supported by the Fundamental Research Funds for the Central UniversitiesSichuan University+1 种基金the University of Hong Kongthe Institute of Chemistry of the Chinese Academy of Sciences for financial support.
文摘Cyclodextrins(CDs)—a class of cyclic oligomers of glucopyranosyl units featuring hydrophilic rims and hydrophobic cavities—have captured the imagination of scientists for over a century.Among all naturally occurring and wholly synthetic macrocycles,CDs have established their credentials as phenomenal compounds that have made vital scientific and technological impacts on a variety of disciplines,such as the chemical,materials,environmental,biological,food,cosmetic,and medical sciences.In this minireview,we look back upon the Stoddart group’s 56-year journey of adventure and achievements in relation to CDs.Advances we have made in the chemical syntheses of CD derivatives,analogues,and enantiomers are summarized.The integration of CDs and their derivatives as nanoscale building blocks for the(non)covalent functionalization of surfaces,nanotubes,and polymers,as well as in the construction and applications of chemically modified molecules and supermolecules—for example,CD-based second-sphere coordination complexes,CD metal–organic frameworks,and CD-based mechanically interlocked molecules—are presented.Our exploration in CD science and technology highlights the versatility of CDs in both fundamental and applied sciences,suggesting that there is still ample room for future discoveries.
基金Supported by the National Natural Science Foundation of China(Grant Nos.50673098&20772152)Renmin University of China,State Key Laboratory of Structure Chemistry(Grant No.20080052)
文摘The anion coordination complex,[ClPt(bpt)4]Cl(bpt=N,N'-bis(3-pyridylmethyl)-2-thiourea),was synthesized and studied by X-ray crystal structure analysis,NMR and FAB mass spectra.In the solid state,the Pt(bpt)4 anion receptor adopts a cone conformation to bind the chloride anion through hydrogen bonds and electrostatic interaction in which the four branches of the thiourea ligands bind the chloride anion to form N-H…Cl-hydrogen bonds(3.49-3.81).The entraped chloride anion is situated above the Pt(Ⅱ)center at 3.52.Further second-sphere coordination assemby from the Pt(bpt)4 core with 8 zinc(Ⅱ)tetraphenylporphyrins(ZnPr)is discussed.
文摘In Euclidean geometry, for a real submanifold M in E n+a , M is a piece of E n if and only if its second fundamental form is identically zero. In projective geometry, for a complex submanifold M in CP n+a , M is a piece of CP n if and only if its projective second fundamental form is identically zero. In CR geometry, we prove the CR analogue of this fact in this paper.
