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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | He, Ming-yuan Xue, Teng Yuan, En-hui Hou, Qiong-wei Zhang, Kun Lam, Koon-fung Albela, Belén Khrouz, Lhoussain Bonneviot, Laurent |
| Description | Author Affiliation: Zhang K ( Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 Zhongshan North Road, 200062, Shanghai, China. kzhang@chem.ecnu.edu.cn) |
| Abstract | Following the structural concept of copper-containing proteins in which dinuclear copper centers are connected by hydroxide bridging ligands, a bidentate copper(II) complex has been incorporated into nano-confined MCM-41 silica by a multistep sequential grafting technique. Characterization by a combination of EPR spectroscopy, X-ray photoelectron spectroscopy (XPS), UV/Vis spectroscopy, IR spectroscopy , and solid-state $^{13}C$ and $^{29}Si$ cross-polarization magic-angle spinning (CP-MAS) NMR suggests that dinuclear Cu complexes are bridged by hydroxide and other counterions (chloride or perchlorate ions), similar to the situation for EPR-undetectable $[Cu^{II}⋅⋅⋅Cu^{II}]$ dimer analogues in biological systems. More importantly, a dynamic mononuclear–dinuclear equilibrium between different coordination modes of copper is observed, which strongly depends on the nature of the counterions $(Cl^{−}$ or $ClO_{4}^{−})$ in the copper precursor and the pore size of the silica matrix (the so-called confinement effect). A proton-transfer mechanism within the hydrogen-bonding network is suggested to explain the dynamic nature of the dinuclear copper complex supported on the MCM-41 silica. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 50 |
| Volume Number | 17 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2011-12-09 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Copper Chemistry Organometallic Compounds Silicon Dioxide Catalysis Crystallography, X-Ray Hydrogen Bonding Magnetic Resonance Spectroscopy Molecular Conformation Photoelectron Spectroscopy Protons Spectrophotometry, Ultraviolet Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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