Structure and 1H NMR study of copper(I) complex with ethylene and tetramethylethylenediamine

A Novel Copper(I)-Based Supported Ionic Liquid Membrane with High Permeability for Ethylene/Ethane Separation

“…An additional peak at 5.33 appeared resulting from the physical solution. Similar phenomena were found in previous studies: , as complexation drew away some electron density, the anisotropic effect presenting in ethylene decreased, and thus an upfield shift was observed…”

A Novel Copper(I)-Based Supported Ionic Liquid Membrane with High Permeability for Ethylene/Ethane Separation

“…An additional peak at 5.33 appeared resulting from the physical solution. Similar phenomena were found in previous studies: , as complexation drew away some electron density, the anisotropic effect presenting in ethylene decreased, and thus an upfield shift was observed…”

Theoretical (DFT) Insights into the Mechanism of Copper-Catalyzed Cyclopropanation Reactions. Implications for Enantioselective Catalysis

“…The structures of the catalyst−olefin complexes with 1:1 (denoted as 5 ) and 1:2 ( 6 ) stoichiometries are shown in Figure . The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) .…”

“…The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) . These structural results indicate the presence of a strong binding interaction for the catalyst−olefin complex.…”

A Kinetico-Mechanistic Study on CuII Deactivators Employed in Atom Transfer Radical Polymerization

“…Our data indicate that the monomer concentration is more likely to affect activation rather than deactivation provided that the absolute concentration of deactivator remains the same as the concentration of monomer is increased (a reasonable assumption for the DMSO/methyl acrylate system). This proposal is consistent with the well-established ability of olefin monomers to coordinate to Cu I L complexes rather than the Cu II complexes. − In this respect, an earlier study also found that the deactivation rate was significantly less affected than the activation rate (in a mixed solvent/monomer system) by changing the identity of the monomer …”

A Novel Copper(I)-Based Supported Ionic Liquid Membrane with High Permeability for Ethylene/Ethane Separation

“…An additional peak at 5.33 appeared resulting from the physical solution. Similar phenomena were found in previous studies: , as complexation drew away some electron density, the anisotropic effect presenting in ethylene decreased, and thus an upfield shift was observed…”

Theoretical (DFT) Insights into the Mechanism of Copper-Catalyzed Cyclopropanation Reactions. Implications for Enantioselective Catalysis

“…The structures of the catalyst−olefin complexes with 1:1 (denoted as 5 ) and 1:2 ( 6 ) stoichiometries are shown in Figure . The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) .…”

“…The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) . These structural results indicate the presence of a strong binding interaction for the catalyst−olefin complex.…”

A Kinetico-Mechanistic Study on CuII Deactivators Employed in Atom Transfer Radical Polymerization

“…Our data indicate that the monomer concentration is more likely to affect activation rather than deactivation provided that the absolute concentration of deactivator remains the same as the concentration of monomer is increased (a reasonable assumption for the DMSO/methyl acrylate system). This proposal is consistent with the well-established ability of olefin monomers to coordinate to Cu I L complexes rather than the Cu II complexes. − In this respect, an earlier study also found that the deactivation rate was significantly less affected than the activation rate (in a mixed solvent/monomer system) by changing the identity of the monomer …”

A Novel Copper(I)-Based Supported Ionic Liquid Membrane with High Permeability for Ethylene/Ethane Separation

“…An additional peak at 5.33 appeared resulting from the physical solution. Similar phenomena were found in previous studies: , as complexation drew away some electron density, the anisotropic effect presenting in ethylene decreased, and thus an upfield shift was observed…”

Theoretical (DFT) Insights into the Mechanism of Copper-Catalyzed Cyclopropanation Reactions. Implications for Enantioselective Catalysis

“…The structures of the catalyst−olefin complexes with 1:1 (denoted as 5 ) and 1:2 ( 6 ) stoichiometries are shown in Figure . The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) .…”

“…The structure of 5 presents a trigonal coordination for copper in such a way that carbon atoms are symmetrically located in the plane containing the catalyst framework, a situation in agreement with experimental data for other ethylene−copper(I) complexes . The calculated Cu···C distance of 1.963 Å is also in good agreement with the experimental values found for these kinds of complexes (1.969−2.019 Å) . These structural results indicate the presence of a strong binding interaction for the catalyst−olefin complex.…”

A Kinetico-Mechanistic Study on CuII Deactivators Employed in Atom Transfer Radical Polymerization

“…Our data indicate that the monomer concentration is more likely to affect activation rather than deactivation provided that the absolute concentration of deactivator remains the same as the concentration of monomer is increased (a reasonable assumption for the DMSO/methyl acrylate system). This proposal is consistent with the well-established ability of olefin monomers to coordinate to Cu I L complexes rather than the Cu II complexes. − In this respect, an earlier study also found that the deactivation rate was significantly less affected than the activation rate (in a mixed solvent/monomer system) by changing the identity of the monomer …”