A novel binuclear europium P-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis. Red light emitting diode (LED) was fabricated ...A novel binuclear europium P-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis. Red light emitting diode (LED) was fabricated by using the novel europium complex as an emitting layer, tris(8-quinolinolate) aluminum (III) (Alq(3)) as an electron-transporting layer, N, N'-diphenyl-N, N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) as a hole-transporting layer. A cell structure of indium-tin-oxide/TPD/Eu-complex/Alq(3)/Mg: Ag was employed. Red electroluminescence was observed at room temperature with dc bias voltage of 2 V in this cell. 2 Red emission peaks at about 613 nm with maximum luminance of over 106 cd/m(2). Compared with the EL luminance from those europium complexes reported before, one from the Eu-complex is best in the same cells.展开更多
Aniline was polymerized in dilute aqueous squaric acid and the polyaniline(PAn) was doped with 10 -1 10 -3 mol/L of squaric acid. The corresponding electrical conductivity of the PAn is 10 -1 ...Aniline was polymerized in dilute aqueous squaric acid and the polyaniline(PAn) was doped with 10 -1 10 -3 mol/L of squaric acid. The corresponding electrical conductivity of the PAn is 10 -1 10 -2 S·cm -1 . The solubility of the doped PAn has been improved in common polar organic solvents . The FTIR and UV-Vis spectra show that the PAn has the structure of both quinone and imine .展开更多
The crystal and electronic structure of antiferroelectric squaric acid is studied using density functional theory method, and the exchange correlation effects are treated by the generalized approximation. In order to ...The crystal and electronic structure of antiferroelectric squaric acid is studied using density functional theory method, and the exchange correlation effects are treated by the generalized approximation. In order to understand the ferroelectricity of H2SQ in the molecular plane and the antiferroelectricity in whole crystal, the density of states, charge density distribution and band structure are calculated. The result showed that O2p and C2p play important roles in the interactions between layers. The hybridizations of 02s-Hls and 02p-Hls are responsible for the tendency to ferroelectricity within each layer.展开更多
Squaric acid(C_(4)H_(4)O_(4))is an organodioic acid characterized by a conjugated structure that features two carbonyl groups,two hydroxyl groups and a four-membered ring.Compared with other ligands,squaric acid has a...Squaric acid(C_(4)H_(4)O_(4))is an organodioic acid characterized by a conjugated structure that features two carbonyl groups,two hydroxyl groups and a four-membered ring.Compared with other ligands,squaric acid has a shorter molecular length and a more rigid conformation.Its strong coordination ability and distinctive coordination mode endow it with unique functionalities,making squaric acid-based metal‒organic frameworks(SA-MOFs)the focus of considerable interest.In recent decades,the diverse structural properties of both 2D and 3D squaric acid-based MOFs have demonstrated their potential for precise structural design.Furthermore,SA-MOFs show significant promise for high-performance applications in various fields,such as materials science and gas adsorption.This paper provides a systematic review of 2D and 3D SA-MOFs,focusing on their structures and properties from the perspective of synthesis methods.Additionally,it offers insights into SA-MOF materials from foundational principles while discussing future prospects and challenges associated with these innovative frameworks.展开更多
基金This work was supported by National Natural Science Foundation of China (29972032) and Provincial Natural Science Foundation of Hunan (00JJY2043).
文摘A novel binuclear europium P-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis. Red light emitting diode (LED) was fabricated by using the novel europium complex as an emitting layer, tris(8-quinolinolate) aluminum (III) (Alq(3)) as an electron-transporting layer, N, N'-diphenyl-N, N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) as a hole-transporting layer. A cell structure of indium-tin-oxide/TPD/Eu-complex/Alq(3)/Mg: Ag was employed. Red electroluminescence was observed at room temperature with dc bias voltage of 2 V in this cell. 2 Red emission peaks at about 613 nm with maximum luminance of over 106 cd/m(2). Compared with the EL luminance from those europium complexes reported before, one from the Eu-complex is best in the same cells.
文摘Aniline was polymerized in dilute aqueous squaric acid and the polyaniline(PAn) was doped with 10 -1 10 -3 mol/L of squaric acid. The corresponding electrical conductivity of the PAn is 10 -1 10 -2 S·cm -1 . The solubility of the doped PAn has been improved in common polar organic solvents . The FTIR and UV-Vis spectra show that the PAn has the structure of both quinone and imine .
基金This work was supported by the National Natural Science Foundation of China under grant No.1998061408.
文摘The crystal and electronic structure of antiferroelectric squaric acid is studied using density functional theory method, and the exchange correlation effects are treated by the generalized approximation. In order to understand the ferroelectricity of H2SQ in the molecular plane and the antiferroelectricity in whole crystal, the density of states, charge density distribution and band structure are calculated. The result showed that O2p and C2p play important roles in the interactions between layers. The hybridizations of 02s-Hls and 02p-Hls are responsible for the tendency to ferroelectricity within each layer.
基金supported by the Fundamental Research Funds for the Central Universities(WK9990000113)the Chinese Academy of Sciences Talent Introduction Program(KJ9990007009).
文摘Squaric acid(C_(4)H_(4)O_(4))is an organodioic acid characterized by a conjugated structure that features two carbonyl groups,two hydroxyl groups and a four-membered ring.Compared with other ligands,squaric acid has a shorter molecular length and a more rigid conformation.Its strong coordination ability and distinctive coordination mode endow it with unique functionalities,making squaric acid-based metal‒organic frameworks(SA-MOFs)the focus of considerable interest.In recent decades,the diverse structural properties of both 2D and 3D squaric acid-based MOFs have demonstrated their potential for precise structural design.Furthermore,SA-MOFs show significant promise for high-performance applications in various fields,such as materials science and gas adsorption.This paper provides a systematic review of 2D and 3D SA-MOFs,focusing on their structures and properties from the perspective of synthesis methods.Additionally,it offers insights into SA-MOF materials from foundational principles while discussing future prospects and challenges associated with these innovative frameworks.
