Two new symmetric chromophores: 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′-styryl)-1, 3, 4- oxadiazole] didibenzothiophene (abbreviated as SO-G1) and 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′- styryl)-1, 3, 4-oxadiazole]-N-ethyl...Two new symmetric chromophores: 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′-styryl)-1, 3, 4- oxadiazole] didibenzothiophene (abbreviated as SO-G1) and 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′- styryl)-1, 3, 4-oxadiazole]-N-ethyl carbazole (abbreviated as NO-G1) have been synthesized and characterized. Both chromophores exhibit strong two-photon absorption (TPA) with the cross-sections of 2.99×10-48 and 3.48×10-48 cm4?s?photon-1 in THF and large up-conversion emission, when pumped by Ti:sapphire femto-second laser at 720 nm.展开更多
Two N-donor auxiliary ligands mediated Zn(Ⅱ) coordination polymers, namely, {[Zn(Hnbta)-(bimm)](3H2O)}n(1) and {[Zn1.5(nbta)(pyim)(H2O)](2H2O)}n(2)(H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bimm = bis(imidazo...Two N-donor auxiliary ligands mediated Zn(Ⅱ) coordination polymers, namely, {[Zn(Hnbta)-(bimm)](3H2O)}n(1) and {[Zn1.5(nbta)(pyim)(H2O)](2H2O)}n(2)(H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bimm = bis(imidazol-1-yl)methane and pyim = N-(4-pyridylmethyl)imidazole), have been prepared by the hydrothermal reaction. Their structures were determined by single-crystal X-ray diffraction analysis, elemental analyses and infrared spectra. Compound 1 possesses a one-dimensional(1D) chain structure, while compound 2 features a two-dimensional(2D) network. In addition, they both exhibit high thermal stabilities and photoluminescent properties in the solid, and can be explored as potential luminescent materials.展开更多
Synthesis and electrochemical polymerization of 9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene （EO-F） into poly[9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene] （EO-PF） films are reported....Synthesis and electrochemical polymerization of 9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene （EO-F） into poly[9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene] （EO-PF） films are reported. The boron trifluoride diethyl etherate electrolyte enables facile preparation of EO-PF films at lower potential compared to LiCIOa/MeCN and the electrochemical polymerizations are discussed. The EO-PF shows good electrochemical behavior and can be dissolved in solvents such as DMSO and THF. The solubility of EO-PF in THF is 2 mg.mL-1 and the number average molecular weight is 35300 with a polydispersity index of 1.65. The side chains on C9 position of the monomer maintain unchanged aRer electrooxidation into corresponding polymer. The EO-PF dissolved in THF under 365 nm ultraviolet light is sky blue light emitting with the Commission Internationale de L＇Eclairage-CIE coordinates of （0.19, 0.15）. The electropolymerized EO-PF is used for the first time in chemosensing metal ions, demonstrating fluorescence quenching for Mn2＋ and Fe3＋ while fluorescence enhancement for Cr6＋ ions.展开更多
基金This work was supported by the NNSFC(No.50273024)the Natural Foundation of Jiangsu Province(No.BK2002041 and BK2003031)the Foundation of Jiangsu Province Education Committee(No.02KJB430001 and 03KJB150115).
文摘Two new symmetric chromophores: 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′-styryl)-1, 3, 4- oxadiazole] didibenzothiophene (abbreviated as SO-G1) and 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′- styryl)-1, 3, 4-oxadiazole]-N-ethyl carbazole (abbreviated as NO-G1) have been synthesized and characterized. Both chromophores exhibit strong two-photon absorption (TPA) with the cross-sections of 2.99×10-48 and 3.48×10-48 cm4?s?photon-1 in THF and large up-conversion emission, when pumped by Ti:sapphire femto-second laser at 720 nm.
基金supported by the grants from Luoyang normal university。
文摘Two N-donor auxiliary ligands mediated Zn(Ⅱ) coordination polymers, namely, {[Zn(Hnbta)-(bimm)](3H2O)}n(1) and {[Zn1.5(nbta)(pyim)(H2O)](2H2O)}n(2)(H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bimm = bis(imidazol-1-yl)methane and pyim = N-(4-pyridylmethyl)imidazole), have been prepared by the hydrothermal reaction. Their structures were determined by single-crystal X-ray diffraction analysis, elemental analyses and infrared spectra. Compound 1 possesses a one-dimensional(1D) chain structure, while compound 2 features a two-dimensional(2D) network. In addition, they both exhibit high thermal stabilities and photoluminescent properties in the solid, and can be explored as potential luminescent materials.
基金financially supported by the National Natural Science Foundation of China(Nos.50903078,21274134)New Century Excellent Talents in Universities(No.NCET-11-0473)
文摘Synthesis and electrochemical polymerization of 9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene （EO-F） into poly[9,9-bis（2-（2-（2-methoxy ethoxy）ethoxy）ethyl）-fluorene] （EO-PF） films are reported. The boron trifluoride diethyl etherate electrolyte enables facile preparation of EO-PF films at lower potential compared to LiCIOa/MeCN and the electrochemical polymerizations are discussed. The EO-PF shows good electrochemical behavior and can be dissolved in solvents such as DMSO and THF. The solubility of EO-PF in THF is 2 mg.mL-1 and the number average molecular weight is 35300 with a polydispersity index of 1.65. The side chains on C9 position of the monomer maintain unchanged aRer electrooxidation into corresponding polymer. The EO-PF dissolved in THF under 365 nm ultraviolet light is sky blue light emitting with the Commission Internationale de L＇Eclairage-CIE coordinates of （0.19, 0.15）. The electropolymerized EO-PF is used for the first time in chemosensing metal ions, demonstrating fluorescence quenching for Mn2＋ and Fe3＋ while fluorescence enhancement for Cr6＋ ions.
