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- W2062042520 abstract "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." @default.
- W2062042520 created "2016-06-24" @default.
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- W2062042520 date "2011-11-09" @default.
- W2062042520 modified "2023-10-18" @default.
- W2062042520 title "Mononuclear-Dinuclear Equilibrium of Grafted Copper Complexes Confined in the Nanochannels of MCM-41 Silica" @default.
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- W2062042520 doi "https://doi.org/10.1002/chem.201102026" @default.