Evidence for nitrile hydrogenation on tungsten(100)-(5 .times. 1)-carbon: spectroscopic studies of surface intermediates derived from hydrogen cyanide

1988 ◽  
Vol 92 (23) ◽  
pp. 6694-6700 ◽  
Author(s):  
J. G. Serafin ◽  
C. M. Friend
Keyword(s):  
Hydrogen Cyanide ◽  
Spectroscopic Studies ◽  
Surface Intermediates

Cyclic Imides. Preparation of Silylphthalimides and Characterization by Infrared and Mass Spectrometry

1971 ◽  
Vol 49 (7) ◽  
pp. 1011-1018 ◽  
Author(s):  
A. F. Janzen ◽  
E. A. Kramer
Keyword(s):  
Gas Phase ◽  
Hydrogen Cyanide ◽  
Chloroform Solution ◽  
Spectroscopic Studies ◽  
Major Effect ◽  
Mechanism Of Formation ◽  
Silicon Ions ◽  
Silyl Groups ◽  
Cyclic Imides ◽  
Electron Donation

A series of silylphthalimides containing silicon substituents —H, —CH3, —C2H5, —CH2CH=CH2, and —C6H5 have been prepared and characterized. The compounds are N-silylated and found to be monomeric in the liquid and gas phase. The i.r. spectroscopic studies in dilute (10−1 M) chloroform solution showed a decrease (approximately 40 cm−1) in the carbonyl stretching frequency on silylation, but relatively small changes (± 7 cm−1) on changing silicon substituents. The major effect appears to be electron donation by silyl groups. The N15 isotopomers were prepared and C—N and Si—N vibrations identified.Mass spectrometric studies of methyl- and phenylsilylphthalimides, including N15 substitution, are reported. A possible mechanism of formation of methyl- and phenylbiphenylene silicon ions, involving loss of methyl or phenyl, carbon dioxide, and hydrogen cyanide, is suggested.

Hydrogen Cyanide Polymers from the Impact of Comet P/Shoemaker-Levy 9 on Jupiter

1997 ◽  
Vol 161 ◽  
pp. 179-187
Author(s):  
Clifford N. Matthews ◽  
Rose A. Pesce-Rodriguez ◽  
Shirley A. Liebman
Keyword(s):  
Amino Acids ◽  
Solar System ◽  
Hydrogen Cyanide ◽  
Nitrogen Heterocycles ◽  
Laboratory Studies ◽  
Heterogeneous Solids ◽  
The Many ◽  
Comet Halley ◽  
The Impact ◽  
By Products

AbstractHydrogen cyanide polymers – heterogeneous solids ranging in color from yellow to orange to brown to black – may be among the organic macromolecules most readily formed within the Solar System. The non-volatile black crust of comet Halley, for example, as well as the extensive orangebrown streaks in the atmosphere of Jupiter, might consist largely of such polymers synthesized from HCN formed by photolysis of methane and ammonia, the color observed depending on the concentration of HCN involved. Laboratory studies of these ubiquitous compounds point to the presence of polyamidine structures synthesized directly from hydrogen cyanide. These would be converted by water to polypeptides which can be further hydrolyzed to α-amino acids. Black polymers and multimers with conjugated ladder structures derived from HCN could also be formed and might well be the source of the many nitrogen heterocycles, adenine included, observed after pyrolysis. The dark brown color arising from the impacts of comet P/Shoemaker-Levy 9 on Jupiter might therefore be mainly caused by the presence of HCN polymers, whether originally present, deposited by the impactor or synthesized directly from HCN. Spectroscopic detection of these predicted macromolecules and their hydrolytic and pyrolytic by-products would strengthen significantly the hypothesis that cyanide polymerization is a preferred pathway for prebiotic and extraterrestrial chemistry.

Rotational spectrum and properties of a complex of hydrogen cyanide and chlorine monofluoride

1996 ◽  
Vol 88 (3) ◽  
pp. 673-682 ◽  
Author(s):  
K. HINDS ◽  
A.C. LEGON ◽  
J.H. HOLLOWAY
Keyword(s):  
Hydrogen Cyanide ◽  
Rotational Spectrum

Spectroscopic studies of Pd (II) complexes with cysteine and its di- and tripeptides

1987 ◽  
Vol 84 ◽  
pp. 443-448 ◽  
Author(s):  
Teresa Kowalik ◽  
Brigitte Decock-Le Reverend ◽  
Claude Loucheux ◽  
Damien Ficheux ◽  
Henryk Kozlowski
Keyword(s):  
Spectroscopic Studies

MÖSSBAUER SPECTROSCOPIC STUDIES OF DIMENSIONALITY AND SPIN REDUCTION EFFECTS IN THE ANTIFERROMAGNETIC SYSTEMS : (AF)n-FeF3

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-187-C1-188 ◽  
Author(s):  
G. P. Gupta ◽  
J. A. Baines ◽  
D. M. Cooper ◽  
D. P.E. Dickson ◽  
C. E. Johnson
Keyword(s):  
Spectroscopic Studies
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