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Jin-hua Wei - One of the best experts on this subject based on the ideXlab platform.
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Aromatic C–H---S interaction in the arenethiolate complexes of cadmium(II) with S2N2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
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aromatic c h s interaction in the arenethiolate complexes of cadmium ii with s2n2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
Wei-yin Sun - One of the best experts on this subject based on the ideXlab platform.
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Structures of [M(cbim)4(NO3)2] [M = Cd(II), Co(II) and Ni(II); cbim = 4'-Cyanobenzyl-1-imidazole] in the solid state and in solution
Bulletin of the Chemical Society of Japan, 2000Co-Authors: Wei-yin Sun, Bao-li Fei, Taka-aki Okamura, Yan-an Zhang, Wenxia Tang, Norikazu UeyamaAbstract:Mononuclear complexes, [M(cbim)4(NO3)2] [M = Cd(II) (1), Co(II) (2) and Ni(II) (3); cbim = 4′–cyanobenzyl–1–imidazole], were synthesized and their structures were determined by X-ray crystallography. Each metal atom is coordinated by four N atoms of imidazole from four cbim ligands and two O atoms of two nitrate anions with distorted octahedral coordination geometry. All three complexes crystallize in triclinic with space group P1. There are C-H···O, C-H···N hydrogen bonds and π-π interactions in the crystal packing of complexes 1, 2, and 3. The compounds were also characterized by 1H and 113Cd NMR Spectroscopy. Highly isotropic shifted signals were observed in the 1H NMR spectra of complexes 2 and 3 due to the paramagnetic property of the high-spin Co(II) and Ni(II) cores.
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Aromatic C–H---S interaction in the arenethiolate complexes of cadmium(II) with S2N2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
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aromatic c h s interaction in the arenethiolate complexes of cadmium ii with s2n2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
Xiao-feng Shi - One of the best experts on this subject based on the ideXlab platform.
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Aromatic C–H---S interaction in the arenethiolate complexes of cadmium(II) with S2N2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
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aromatic c h s interaction in the arenethiolate complexes of cadmium ii with s2n2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
Li Zhang - One of the best experts on this subject based on the ideXlab platform.
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Aromatic C–H---S interaction in the arenethiolate complexes of cadmium(II) with S2N2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
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aromatic c h s interaction in the arenethiolate complexes of cadmium ii with s2n2 donor set evidenced from 113Cd NMR Spectroscopy
Journal of Inorganic Biochemistry, 1999Co-Authors: Wei-yin Sun, Xiao-feng Shi, Li Zhang, Jin-hua WeiAbstract:Abstract 113 Cd NMR Spectroscopy was employed to investigate the interactions between aromatic C–H and the coordinated sulfur atom in the neutral four-coordinated cadmium(II) complexes, [Cd{S-2-(4-X-C 6 H 4 CONH)C 6 H 4 } 2 (1-MeIm) 2 ] (X=H, OMe, F and CN; 1-MeIm=1-methylimidazole). The coordinating atom set here is S 2 N 2 that is similar to the zinc and iron sites in the known metalloproteins such as zinc finger and ferredoxins, respectively. The observation of 113 Cd NMR signals in the range 480–420 ppm in chloroform at 298 K indicates that the cadmium(II) ion is bound with the S 2 N 2 donor set in solution. The complex without substituent (i.e. X=H) exhibits a 113 Cd NMR signal at 475 ppm while the analog with the strongest electron-withdrawing cyano substituent gives a signal at 424 ppm in chloroform at 298 K. The chemical shifts of cadmium(II) complexes with a variety of substituents had a linear correlation with the Hammett σ m values rather than the σ p values, although the substituents are at the para -position of the benzoyl group. The results demonstrate that there are aromatic C–H---S interactions between the protons of the benzoyl group and the coordinated sulfur atom in the cadmium(II) complexes with S 2 N 2 binding site, in addition to the NH---S hydrogen bonds which were confirmed by infrared and 1 H NMR spectroscopies.
C. H. Moon - One of the best experts on this subject based on the ideXlab platform.
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Adsorption of Cadmium Species on Montmorillonite Investigated by 113Cd NMR Spectroscopy
Environmental Technology, 1996Co-Authors: S. Jun, K. H. Chung, C. H. MoonAbstract:Increasing quantities of montmorillonite (1, 2, and 3% w/v) were added to aqueous CdCl2 solution ([CdCl2] = 4.11 × 10−2 M) and the change in the cadmium and chloride concentrations remaining in the supernatants were measured from the peak intensity and chemical shift data obtained from 113Cd NMR spectra. The decrease of cadmium concentration was not accompanied by any changes in the chloride concentration, indicating that only the free cadmium ion (Cd2+) is adsorbed on the negatively charged solid-surfaces of montmorillonite. A single peak at chemical shift of δ −8 was recorded in the 113Cd magic angle spinning (MAS) NMR spectrum of the sedimented montmorillonite. This value is similar to that obtained for the solid [Cd(H2O)6](ClO4)2, indicating that only Cd2+ ion is selectively adsorbed and are bound to oxygen donors of montmorillonite clays.
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selective binding of cd2 by natural and synthetic organic macromolecules investigated by 113Cd NMR Spectroscopy
Environmental Technology, 1994Co-Authors: K. H. Chung, C. H. MoonAbstract:Abstract Poly(methacrylic acid) or humic acids were added in increasing quantities to aqueous CdCl2 solutions (5.25 × 10‐2 M, pH = 6), and the changes in the concentrations of both the free cadmium and chloride ions remaining in the supernatant were measured from the peak intensity and chemical shift data of the 113Cd NMR spectra. The decrease in the cadmium concentration was not accompanied by any changes in the chloride concentration, suggesting that only the Cd2+ ion is selectively bound by the synthetic and naturally occurring organic macromolecules.
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Selective binding of Cd2+ by natural and synthetic organic macromolecules investigated by 113Cd‐NMR Spectroscopy
Environmental Technology, 1994Co-Authors: K. H. Chung, C. H. MoonAbstract:Abstract Poly(methacrylic acid) or humic acids were added in increasing quantities to aqueous CdCl2 solutions (5.25 × 10‐2 M, pH = 6), and the changes in the concentrations of both the free cadmium and chloride ions remaining in the supernatant were measured from the peak intensity and chemical shift data of the 113Cd NMR spectra. The decrease in the cadmium concentration was not accompanied by any changes in the chloride concentration, suggesting that only the Cd2+ ion is selectively bound by the synthetic and naturally occurring organic macromolecules.
