The Experts below are selected from a list of 63303 Experts worldwide ranked by ideXlab platform
Jianding Qiu - One of the best experts on this subject based on the ideXlab platform.
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nitrogen doped graphene quantum dots as a new catalyst accelerating the Coordination Reaction between cadmium ii and 5 10 15 20 tetrakis 1 methyl 4 pyridinio porphyrin for cadmium ii sensing
Analytical Chemistry, 2015Co-Authors: Li Zhang, Dong Peng, Ruping Liang, Jianding QiuAbstract:Small molecules or metal ions can be employed as catalysts to accelerate metalloporphyrin formation. Herein, we for the first time report the Coordination Reaction between cadmium(II) and 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin can be accelerated by nitrogen-doped graphene quantum dots (NGQDs). This catalytic Reaction results in the change of the absorption of porphyrins and the fluorescence of NGQDs as a result of the inner filter effect (IFE) of the porphyrins on the assembled NGQDs. Both signals can be used for rapid and sensitive determination of metal ions. The present work promises a novel strategy for constructing sensors for metal ions.
Li Zhang - One of the best experts on this subject based on the ideXlab platform.
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nitrogen doped graphene quantum dots as a new catalyst accelerating the Coordination Reaction between cadmium ii and 5 10 15 20 tetrakis 1 methyl 4 pyridinio porphyrin for cadmium ii sensing
Analytical Chemistry, 2015Co-Authors: Li Zhang, Dong Peng, Ruping Liang, Jianding QiuAbstract:Small molecules or metal ions can be employed as catalysts to accelerate metalloporphyrin formation. Herein, we for the first time report the Coordination Reaction between cadmium(II) and 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin can be accelerated by nitrogen-doped graphene quantum dots (NGQDs). This catalytic Reaction results in the change of the absorption of porphyrins and the fluorescence of NGQDs as a result of the inner filter effect (IFE) of the porphyrins on the assembled NGQDs. Both signals can be used for rapid and sensitive determination of metal ions. The present work promises a novel strategy for constructing sensors for metal ions.
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silver i directed growth of metal organic complex nanocrystals with bidentate ligands of hydroquinine anthraquinone 1 4 diyl diethers as linkers at the water chloroform interface
Nanoscale Research Letters, 2014Co-Authors: Ying Tang, Li Zhang, Huiting Wang, Meng Chen, Dongjin Qian, Minghua LiuAbstract:Immiscible liquid-liquid interfaces provide unique double phase regions for the design and construction of nanoscale materials. Here, we reported Ag(I)-directed growth of metal-organic complex nanocrystals by using AgNO3 as a connector in the aqueous solution and bidentate ligand of 1,4-bis(9-O-dihydroquininyl)anthraquinone [(DHQ)2AQN] and its enantiomer of (DHQD)2AQN in the chloroform solutions as linkers. The Ag-(DHQ)2AQN and Ag-(DHQD)2AQN complex nanocrystals were formed at the liquid-liquid interfaces and characterized by using UV-vis absorption and fluorescence spectroscopy and X-ray photoelectron spectroscopy, as well as by using scanning electron microscopy. Screw-like nanocrystals were formed at the initial 30 min after the interfacial Coordination Reaction started, then they grew into nanorods after several days, and finally became cubic microcrystals after 2 weeks. The pure ligand showed two emission bands centered at about 363 and 522 nm in the methanol solution, the second one of which was quenched and shifted to about 470 nm in the Ag-complex nanocrystals. Two couples of reversible redox waves were recorded for the Ag-complex nanocrystals; one centered at about -0.25 V (vs. Ag/AgCl) was designated to one electron transfer process of Ag - (DHQ)2AQN and Ag - (DHQ)2AQN+, and the other one centered at about 0.2 V was designated to one electron transfer process of Ag - (DHQ)2AQN and Ag+ - (DHQ)2AQN.
Chun Li - One of the best experts on this subject based on the ideXlab platform.
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chemically converted graphene induced molecular flattening of 5 10 15 20 tetrakis 1 methyl 4 pyridinio porphyrin and its application for optical detection of cadmium ii ions
Journal of the American Chemical Society, 2009Co-Authors: Yuxi Xu, Lu Zhao, Wenjing Hong, Chun LiAbstract:Complexation of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) and negatively charged chemically converted graphene (CCG) sheets was performed by simply mixing the diluted aqueous solutions of both components. During this process, a large bathochromic shift of porphyrin Soret band from 421 to 458 nm was observed, which is attributed to the flattening of TMPyP molecules induced by CCG through electrostatic and π−π stacking cooperative interactions. Furthermore, the Coordination Reaction between TMPyP and Cd2+ ions was greatly accelerated from 20 h to 8 min under ambient conditions by introducing CCG sheets. On the basis of this phenomenon, we used the complex of TMPyP and CCG as an optical probe for rapid and selective detection of Cd2+ ions in aqueous media.
Zhongfan Liu - One of the best experts on this subject based on the ideXlab platform.
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formation of a porphyrin monolayer film by axial ligation of protoporphyrin ix zinc to an amino terminated silanized glass surface
Langmuir, 2000Co-Authors: Zhijun Zhang, Zhongfan LiuAbstract:A porphyrin covalently appended monolayer film on a glass substrate prepared by axial Coordination Reaction of protoporphyrin IX zinc (ZnPP) and a self-assembled monolayer of (3-aminopropyl)trimethoxysilane on a glass surface was reported. The structure and stability of the porphyrin film to photo Reaction, acid, and base and its reactivity with imidazole were investigated using X-ray photoelectron spectroscopy and UV−visible spectroscopy.
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formation of a porphyrin monolayer film by axial ligation of protoporphyrin ix zinc to an amino terminated silanized glass surface
Langmuir, 2000Co-Authors: Zhijun Zhang, Zhongfan LiuAbstract:A porphyrin covalently appended monolayer film on a glass substrate prepared by axial Coordination Reaction of protoporphyrin IX zinc (ZnPP) and a self-assembled monolayer of (3-aminopropyl)trimeth...
Yuxi Xu - One of the best experts on this subject based on the ideXlab platform.
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chemically converted graphene induced molecular flattening of 5 10 15 20 tetrakis 1 methyl 4 pyridinio porphyrin and its application for optical detection of cadmium ii ions
Journal of the American Chemical Society, 2009Co-Authors: Yuxi Xu, Lu Zhao, Wenjing Hong, Chun LiAbstract:Complexation of cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) and negatively charged chemically converted graphene (CCG) sheets was performed by simply mixing the diluted aqueous solutions of both components. During this process, a large bathochromic shift of porphyrin Soret band from 421 to 458 nm was observed, which is attributed to the flattening of TMPyP molecules induced by CCG through electrostatic and π−π stacking cooperative interactions. Furthermore, the Coordination Reaction between TMPyP and Cd2+ ions was greatly accelerated from 20 h to 8 min under ambient conditions by introducing CCG sheets. On the basis of this phenomenon, we used the complex of TMPyP and CCG as an optical probe for rapid and selective detection of Cd2+ ions in aqueous media.