The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Zhengfa Yang - One of the best experts on this subject based on the ideXlab platform.
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synthesis and fluorescence properties of tb iii complex with a novel Aromatic Carboxylic Acid l as well as spectroscopic studies on the interaction between tb iii complex and bovine serum albumin
Journal of Luminescence, 2013Co-Authors: Jiqing Bao, Zhenfeng Zhang, Ruiren Tang, Hongxing Han, Zhengfa YangAbstract:Abstract A novel Aromatic polyCarboxylic Acid ligand, 2,6-bis(3,5-dicarboxypyrazol-1-ylmethyl) pyridine ( L ) was designed and synthesized. Its corresponding Tb(III) complex [Tb L (H 2 O) 4 ]Cl·H 2 O was successfully prepared. The ligand L and the complex [Tb L (H 2 O) 4 ]Cl·H 2 O were characterized by elemental analysis, IR, 1 HNMR, EI–MS and TG–DSC. The investigation of fluorescence property of the complex showed that the Tb(III) ion could be sensitized efficiently by the ligand. In order to explore the potential biologically active value of [Tb L (H 2 O) 4 ]Cl·H 2 O, the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with bovine serum albumin (BSA) has been investigated by fluorescence quenching spectra, UV–vis absorbance and synchronous fluorescence spectra. The fluorescence quenching mechanism of BSA by [Tb L (H 2 O) 4 ]Cl·H 2 O was analyzed. The binding site number n and binding constant K a were calculated according to the double logarithm regression equation. The thermodynamic parameters showed the van der Waals and hydrogen bond interactions were the predominant intermolecular forces in the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with BSA. Furthermore, the effect of [Tb L (H 2 O) 4 ]Cl·H 2 O on the conformation of BSA was analyzed according to synchronous fluorescence.
Baojiao Gao - One of the best experts on this subject based on the ideXlab platform.
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structure and photoluminescence property of complexes of Aromatic Carboxylic Acid functionalized polysulfone with eu iii and tb iii
Materials Chemistry and Physics, 2014Co-Authors: Baojiao Gao, Zongwen Qiao, Tao ChenAbstract:Abstract With chloromethylated polysulfone as starting substance, naphthoic Acid (NA) and benzoic Acid (BA) were bonded onto the side chains of polysulfone (PSF) via polymer reactions, obtaining two kinds of Aromatic carboxyl Acid-functionalized polysulfone, PSFNA and PSFBA. Subsequently, the luminescent binary and ternary polymer-rare earth complexes of Eu(Ⅲ) and Tb(Ⅲ) were prepared through coordination reactions, respectively, with PSFNA and PSFBA as macromolecule ligands and with 1,10-phenanthroline (Phen) and 4,4′-bipyridine (Bipy) as small-molecule co-ligands. This work focuses on investigating the relationship between structure and photoluminescence property of these complexes. The experimental results indicate that the macromolecule ligands PSFNA and PSFBA can strongly sensitize the fluorescence emissions of Eu3+ ion or Tb3+ ion, and the sensitization effect is strongly dependent on the structure of the ligands and the property of the central ions. The fluorescence emission of the binary complex PSF–(NA)3–Eu(Ⅲ) is stronger than that PSF–(BA)3–Eu(Ⅲ), suggesting the bonded ligand NA has stronger sensitization action for Eu3+ ion than ligand BA; The binary complex PSF–(BA)3–Tb(Ⅲ) emit very strong characteristic fluorescence of Tb3+ ion, displaying that ligand BA can strongly sensitize Tb3+ ion, whereas PSF–(NA)3–Tb(Ⅲ) does not emit the characteristic fluorescence of Tb3+ ion, showing that the bonded ligand NA does not sensitize Tb3+ ion. The fluorescence intensity of the ternary complexes is stronger than that of the binary complexes in the same series. The solid films of these complexes also emit the strong characteristic fluorescence of Eu3+ ion or Tb3+ ion.
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preparation of Aromatic Carboxylic Acid functionalized polysulfone and preliminary exploration of florescence emission character of formed polymer rare earth complexes
Synthetic Metals, 2012Co-Authors: Baojiao Gao, Li Fang, Ruixia Zhang, Jiying MenAbstract:Abstract Polysulfone (PSF) was modified via a polymer reaction, Friedel–Crafts alkylation of PSF with 4-(chloromethyl) benzoic Acid (CMBA) as reaction reagent, and benzoic Acid (BA) ligand was bonded onto the side chains of PSF, resulting in the Aromatic Carboxylic Acid-functionalized PSF, BAPSF. The chemical structure of BAPSF was characterized by FTIR, 1H NMR and UV/vis absorption spectrum. BAPSF was allowed to coordinate to Eu(III) and Tb(III) ions, respectively, and two luminescent polymer-rare earth complexes, BAPSF-Eu(III) and BAPSF-Tb(III) were prepared. The fluorescence emission character of the two complexes was preliminarily explored. The functionalization modification process of PSF and the reaction mechanism were emphatically investigated. The experimental results show that the Friedel–Crafts alkylation reaction between PSF and CMBA can be carried out smoothly. The two polymer-rare earth complexes, BAPSF-Eu(III) and BAPSF-Tb(III), exhibit the characteristic fluorescence emissions of Eu3+ and Tb3+ ions, respectively. More importantly, BAPSF can powerfully sensitize the fluorescence emissions of Eu3+ and Tb3+ ions, and the effective energy transfer indeed take places from the macromolecular ligand BAPSF to the coordinated Re3+ and Tb3+ ions.
Min Zhang - One of the best experts on this subject based on the ideXlab platform.
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silver catalyzed arylation of hetero arenes by oxidative decarboxylation of Aromatic Carboxylic Acids
Angewandte Chemie, 2015Co-Authors: Jian Kan, Shijun Huang, Jin Lin, Min ZhangAbstract:A long-standing challenge in Minisci reactions is achieving the arylation of heteroarenes by oxidative decarboxylation of Aromatic Carboxylic Acids. To address this challenge, the silver-catalyzed intermolecular Minisci reaction of Aromatic Carboxylic Acids was developed. With an inexpensive silver salt as a catalyst, this new reaction enables a variety of Aromatic Carboxylic Acids to undergo decarboxylative coupling with electron-deficient arenes or heteroarenes regardless of the position of the substituents on the Aromatic Carboxylic Acid, thus eliminating the need for ortho-substituted Aromatic Carboxylic Acids, which were a limitation of previously reported methods.
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Silver‐Catalyzed Arylation of (Hetero)arenes by Oxidative Decarboxylation of Aromatic Carboxylic Acids
Angewandte Chemie (International ed. in English), 2014Co-Authors: Jian Kan, Shijun Huang, Jin Lin, Min ZhangAbstract:A long-standing challenge in Minisci reactions is achieving the arylation of heteroarenes by oxidative decarboxylation of Aromatic Carboxylic Acids. To address this challenge, the silver-catalyzed intermolecular Minisci reaction of Aromatic Carboxylic Acids was developed. With an inexpensive silver salt as a catalyst, this new reaction enables a variety of Aromatic Carboxylic Acids to undergo decarboxylative coupling with electron-deficient arenes or heteroarenes regardless of the position of the substituents on the Aromatic Carboxylic Acid, thus eliminating the need for ortho-substituted Aromatic Carboxylic Acids, which were a limitation of previously reported methods.
Jiying Men - One of the best experts on this subject based on the ideXlab platform.
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preparation of Aromatic Carboxylic Acid functionalized polysulfone and preliminary exploration of florescence emission character of formed polymer rare earth complexes
Synthetic Metals, 2012Co-Authors: Baojiao Gao, Li Fang, Ruixia Zhang, Jiying MenAbstract:Abstract Polysulfone (PSF) was modified via a polymer reaction, Friedel–Crafts alkylation of PSF with 4-(chloromethyl) benzoic Acid (CMBA) as reaction reagent, and benzoic Acid (BA) ligand was bonded onto the side chains of PSF, resulting in the Aromatic Carboxylic Acid-functionalized PSF, BAPSF. The chemical structure of BAPSF was characterized by FTIR, 1H NMR and UV/vis absorption spectrum. BAPSF was allowed to coordinate to Eu(III) and Tb(III) ions, respectively, and two luminescent polymer-rare earth complexes, BAPSF-Eu(III) and BAPSF-Tb(III) were prepared. The fluorescence emission character of the two complexes was preliminarily explored. The functionalization modification process of PSF and the reaction mechanism were emphatically investigated. The experimental results show that the Friedel–Crafts alkylation reaction between PSF and CMBA can be carried out smoothly. The two polymer-rare earth complexes, BAPSF-Eu(III) and BAPSF-Tb(III), exhibit the characteristic fluorescence emissions of Eu3+ and Tb3+ ions, respectively. More importantly, BAPSF can powerfully sensitize the fluorescence emissions of Eu3+ and Tb3+ ions, and the effective energy transfer indeed take places from the macromolecular ligand BAPSF to the coordinated Re3+ and Tb3+ ions.
Jiqing Bao - One of the best experts on this subject based on the ideXlab platform.
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synthesis and fluorescence properties of tb iii complex with a novel Aromatic Carboxylic Acid l as well as spectroscopic studies on the interaction between tb iii complex and bovine serum albumin
Journal of Luminescence, 2013Co-Authors: Jiqing Bao, Zhenfeng Zhang, Ruiren Tang, Hongxing Han, Zhengfa YangAbstract:Abstract A novel Aromatic polyCarboxylic Acid ligand, 2,6-bis(3,5-dicarboxypyrazol-1-ylmethyl) pyridine ( L ) was designed and synthesized. Its corresponding Tb(III) complex [Tb L (H 2 O) 4 ]Cl·H 2 O was successfully prepared. The ligand L and the complex [Tb L (H 2 O) 4 ]Cl·H 2 O were characterized by elemental analysis, IR, 1 HNMR, EI–MS and TG–DSC. The investigation of fluorescence property of the complex showed that the Tb(III) ion could be sensitized efficiently by the ligand. In order to explore the potential biologically active value of [Tb L (H 2 O) 4 ]Cl·H 2 O, the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with bovine serum albumin (BSA) has been investigated by fluorescence quenching spectra, UV–vis absorbance and synchronous fluorescence spectra. The fluorescence quenching mechanism of BSA by [Tb L (H 2 O) 4 ]Cl·H 2 O was analyzed. The binding site number n and binding constant K a were calculated according to the double logarithm regression equation. The thermodynamic parameters showed the van der Waals and hydrogen bond interactions were the predominant intermolecular forces in the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with BSA. Furthermore, the effect of [Tb L (H 2 O) 4 ]Cl·H 2 O on the conformation of BSA was analyzed according to synchronous fluorescence.