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Articles 691 - 696 of 696
Full-Text Articles in Chemistry
A Solid State 13C-Nmr Study Of Diamonds And Graphites, Charles A. Wilkie, Thomas C. Ehlert, Daniel T. Haworth
A Solid State 13C-Nmr Study Of Diamonds And Graphites, Charles A. Wilkie, Thomas C. Ehlert, Daniel T. Haworth
Chemistry Faculty Research and Publications
The 13C-NMR spectra of gem quality and industrial diamonds show two resonances with the more intense resonance at high field. Two resonances are also shown in 13C-NMR spectra of various graphites; however, the low field resonance is of greater intensity than the high field resonance in the graphites. The resonances are very broad and they are assigned to graphite type (sp2) carbon and diamond type (sp3) carbon.
The 13C-Nmr Solid State Spectroscopy Of Various Classes Of Coals, Charles A. Wilkie, Daniel T. Haworth
The 13C-Nmr Solid State Spectroscopy Of Various Classes Of Coals, Charles A. Wilkie, Daniel T. Haworth
Chemistry Faculty Research and Publications
The 13C-NMR spectra of various classes of coal obtained in the solid state show two resonances, one of which is assigned to aromatic carbon and the other to aliphatic carbon. The resonances are very broad with the high field resonance centered at about 7 ppm below tetramethylsilane and a low field resonance centered at about 140 ppm below tetramethysilane. Based on our previous solid state 13C-NMR studies of graphite and diamond, the high field resonance is typical of a sp3 carbon whereas the low fields resonance is assigned to a sp2 carbon whereas the low fields …
The Solid State 13C-Nmr Spectra Of Some Carbides, Daniel T. Haworth, Charles A. Wilkie
The Solid State 13C-Nmr Spectra Of Some Carbides, Daniel T. Haworth, Charles A. Wilkie
Chemistry Faculty Research and Publications
The utility of NMR spectroscopy to the study of liquids or solids dissolved in liquids is well known. This technique has been used infrequently to studies in the solid state[I,2]. Work has been done on diamond, graphite and coa113-6]. The 13C-NMR of ebony and ivory have been studied by the magic angle technique[7]. The solid state 13C-NMR spectra of graphite and diamond can be interpreted in terms of tetrahedral (sp3) and trigonal planar (sp2) carbon atoms[8]. We now report our investigations using solid state 13C-NMR spectroscopy to study various types of carbides.
The Effect Of Slow Two‐Electron Transfers And Disproportionation On Cyclic Voltammograms, Michael D. Ryan
The Effect Of Slow Two‐Electron Transfers And Disproportionation On Cyclic Voltammograms, Michael D. Ryan
Chemistry Faculty Research and Publications
The EE mechanism (two‐electron transfer) for cyclic voltammetry was investigated in considerable detail along with the effect of disproportionation. The theory was developed for either the first or second electron transfer being slow while the other one was reversible. It was possible to develop generalized working curves for the height and shape of the wave regardless of the difference in Eo's and the values of α and Ks. This theory was then applied to the analysis of the reduction of benzil in the presence of alkaline earth ions in dimethylformamide.
A 13C-Nmr Study Of Cis-Ti(Ac Ac)2Cl2, Daniel T. Haworth, Charles A. Wilkie
A 13C-Nmr Study Of Cis-Ti(Ac Ac)2Cl2, Daniel T. Haworth, Charles A. Wilkie
Chemistry Faculty Research and Publications
No abstract provided.
Effect Of Sodium Ions On The Electrochemical Reduction Of Diethyl Fumarate In Dimethylsulfoxide And Acetonitrile, Michael D. Ryan, Dennis H. Evans
Effect Of Sodium Ions On The Electrochemical Reduction Of Diethyl Fumarate In Dimethylsulfoxide And Acetonitrile, Michael D. Ryan, Dennis H. Evans
Chemistry Faculty Research and Publications
No abstract provided.