The research on electroluminescence based on europium（III） complexes has come to an important phase. This article reviewed the progresses in photoluminescence and electrohiminescence of Eu（III） complexes in recent...The research on electroluminescence based on europium（III） complexes has come to an important phase. This article reviewed the progresses in photoluminescence and electrohiminescence of Eu（III） complexes in recent years from the views of the design of Eu（III） complexes and optimization of device structures, and discussed some important factors influencing electroluminescence performance. The problems existing in the practical application such as the volatility and thermal stability of Eu（III） complexes in this area were discussed, and the possible corresponding solutions were briefly prospected.展开更多
A new compound of general formula {[(H2O)2K(μ-H2O)Sr]@[Cr(C2O4)3]}n (1) has been synthesized in water and characterized by elemental and thermal analyses, EDX, IR and UV-Vis spectroscopies and by single crystal X-ray...A new compound of general formula {[(H2O)2K(μ-H2O)Sr]@[Cr(C2O4)3]}n (1) has been synthesized in water and characterized by elemental and thermal analyses, EDX, IR and UV-Vis spectroscopies and by single crystal X-ray structure determination. Compound 1 crystallizes in the chiral space group Fdd2 of orthorhombic system with a = 14.110 (4) ?, b = 36.074 (11)?, c =11.034 (3)? and Z = 16. Compound 1 is a coordination polymer in which the three-dimensional lattice framework is realized by the interconnectivity between K+ cations, Sr2+ cations, aqua ligands and [Cr(C2O4)3]3– complex anions. The asymmetric unit of 1 consists of one cationic motif formally written [(H2O)2K(μ-H2O)Sr]3+ and one anionic entity, [Cr(C2O4)3]3–. The K+ and Sr2+ ions in the cationic motif are both eight-coordinate while the Cr3+ ions in the anionic complex are six-coordinate in a distorted octahedral geometry. Coulombic interactions between the ionic motifs and the three-dimensional H-bonding involving aqua ligands help to consolidate the bulk structure. Thermogra-vimetric analysis (TGA) shows that compound 1 is stable to heat up to ca. 80℃.展开更多
The complex Eu(btfa) 3(phen) (btfa=4,4,4 trifluoro 1 phenyl 1,3 butanedione, phen=1,10 phenanthroline) has been prepared and characterized by elemental analysis, IR and UV spectroscopies. The crystal and molecu...The complex Eu(btfa) 3(phen) (btfa=4,4,4 trifluoro 1 phenyl 1,3 butanedione, phen=1,10 phenanthroline) has been prepared and characterized by elemental analysis, IR and UV spectroscopies. The crystal and molecular structures of the complex have been determined by X ray diffraction analysis. It belongs to the monoclinic crystal system, space group P 2 1/ c with a =0 9700(2) nm, b =3 7450(5) nm, c =1 0917(3) nm, β =92 51(2)°, V =3 962(1) nm 3, Z =4, D c=1 639 g/cm 3, μ =1 676 mm -1 , F (000) =1936, R 1=0 0388, wR 2=0 0775. Structure analysis shows that the europium(III) ion is coordinated to six oxygen atoms of β diketonate anions and two nitrogen atoms of phenanthroline molecule. The coordination polyhedron is an approximate square antiprism.展开更多
Chiral-at-metal strategy was developed to resolve the essential sulfoxide pharmaceutical intermediates R-modafinil acid and its ana-logues with high yields and ee values.The efficient resolution process was achieved b...Chiral-at-metal strategy was developed to resolve the essential sulfoxide pharmaceutical intermediates R-modafinil acid and its ana-logues with high yields and ee values.The efficient resolution process was achieved based on the diastereoselective discrimination caused by hydrogen bond and intramolecular π-π interaction between chiral-at-metal center and the coordinated chiral sulfoxide ligands.Moreover,the chiral Ir(lll)receptor can be reused with complete retention of their configurations and without the loss of reaction activity and enantioselectivity.This work provides a new access to synthesize R-modafinil acid as well as its analogues and develops the application of chiral-at-metal strategy in chiral resolution.展开更多
基金supported by the National Basic Research Program (2006CB601103)the National Natural Science Foundation of China (20221101, 20423005, 20471004, 90401028, 50372002, 20671006)
文摘The research on electroluminescence based on europium（III） complexes has come to an important phase. This article reviewed the progresses in photoluminescence and electrohiminescence of Eu（III） complexes in recent years from the views of the design of Eu（III） complexes and optimization of device structures, and discussed some important factors influencing electroluminescence performance. The problems existing in the practical application such as the volatility and thermal stability of Eu（III） complexes in this area were discussed, and the possible corresponding solutions were briefly prospected.
文摘A new compound of general formula {[(H2O)2K(μ-H2O)Sr]@[Cr(C2O4)3]}n (1) has been synthesized in water and characterized by elemental and thermal analyses, EDX, IR and UV-Vis spectroscopies and by single crystal X-ray structure determination. Compound 1 crystallizes in the chiral space group Fdd2 of orthorhombic system with a = 14.110 (4) ?, b = 36.074 (11)?, c =11.034 (3)? and Z = 16. Compound 1 is a coordination polymer in which the three-dimensional lattice framework is realized by the interconnectivity between K+ cations, Sr2+ cations, aqua ligands and [Cr(C2O4)3]3– complex anions. The asymmetric unit of 1 consists of one cationic motif formally written [(H2O)2K(μ-H2O)Sr]3+ and one anionic entity, [Cr(C2O4)3]3–. The K+ and Sr2+ ions in the cationic motif are both eight-coordinate while the Cr3+ ions in the anionic complex are six-coordinate in a distorted octahedral geometry. Coulombic interactions between the ionic motifs and the three-dimensional H-bonding involving aqua ligands help to consolidate the bulk structure. Thermogra-vimetric analysis (TGA) shows that compound 1 is stable to heat up to ca. 80℃.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 97710 0 5 )
文摘The complex Eu(btfa) 3(phen) (btfa=4,4,4 trifluoro 1 phenyl 1,3 butanedione, phen=1,10 phenanthroline) has been prepared and characterized by elemental analysis, IR and UV spectroscopies. The crystal and molecular structures of the complex have been determined by X ray diffraction analysis. It belongs to the monoclinic crystal system, space group P 2 1/ c with a =0 9700(2) nm, b =3 7450(5) nm, c =1 0917(3) nm, β =92 51(2)°, V =3 962(1) nm 3, Z =4, D c=1 639 g/cm 3, μ =1 676 mm -1 , F (000) =1936, R 1=0 0388, wR 2=0 0775. Structure analysis shows that the europium(III) ion is coordinated to six oxygen atoms of β diketonate anions and two nitrogen atoms of phenanthroline molecule. The coordination polyhedron is an approximate square antiprism.
基金supported by the Jiangsu Province Science Foundation for Youths (Grant No.BK20150569)the National Natural Science Foundation of China (Grant No.201502088)+1 种基金the project of Scientific and Technological Support Program in Jiangsu province (Grant No.BE2014147-2)the Doctoral Fund of the Ministry of Education of China for financial support (Grant No.20120091130002)~~
基金the National Natural Science Foundation of China(No.21971266)the Guangdong Provincial Key Platforms and Major Scientific Research Projects of Universities(No.2019KQNCX101)+1 种基金the Pan Deng Project of Guangdong Province(No.pdjh2020b0431)We also thank Dr.Long Jiang from Sun Yat-sen University instrumental analysis and research center.
文摘Chiral-at-metal strategy was developed to resolve the essential sulfoxide pharmaceutical intermediates R-modafinil acid and its ana-logues with high yields and ee values.The efficient resolution process was achieved based on the diastereoselective discrimination caused by hydrogen bond and intramolecular π-π interaction between chiral-at-metal center and the coordinated chiral sulfoxide ligands.Moreover,the chiral Ir(lll)receptor can be reused with complete retention of their configurations and without the loss of reaction activity and enantioselectivity.This work provides a new access to synthesize R-modafinil acid as well as its analogues and develops the application of chiral-at-metal strategy in chiral resolution.
