scholarly journals Infrared Absorption Spectra of Monohydric Alcohols

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Irina Doroshenko ◽  
Valeriy Pogorelov ◽  
Valdas Sablinskas
Keyword(s):  
Gas Phase ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Condensed Phase ◽  
Vibrational Spectra ◽  
Homologous Series ◽  
Ftir Spectra ◽  
Hydroxyl Group ◽  
Monohydric Alcohols ◽  
Infrared Absorption Spectra

FTIR spectra of homologous series of monohydric alcohols which belong to the class of partly ordered liquids were registered. The molecules of monohydric alcohols containing hydroxyl group are able to form hydrogen-bonded clusters in the condensed phase. The existence of clusters is clearly observed from the position and the contour of the stretch OH band in the vibrational spectra of liquid alcohols. In this work, the experimentally registered FTIR spectra of liquid n-alcohols from methanol to decanol are presented as well as the same spectra of methanol, ethanol, propanol, butanol, pentanol, and hexanol in gas phase.

THE PAPILIONACEOUS ALKALOIDS: XVIII. LUPINUS SERICEUS PURSH.

1953 ◽  
Vol 31 (2) ◽  
pp. 181-186 ◽  
Author(s):  
Léo Marion ◽  
Nelson J. Leonard ◽  
Barry P. Moore
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
The Other ◽  
Hydroxyl Group ◽  
Infrared Absorption Spectra ◽  
Lupinus Sericeus

The plant investigated has been found to contain at least five alkaloids, three of which, l-sparteine, d-lupanine, and d-α-isolupanine, are of known structure. The remaining two are both isomeric with hydroxylupanine. One of these, lupilaxine, was identical with a base previously reported as occurring in Lupinuslaxus. The other, lupanoline, appeared to be new. Both these alkaloids were shown by their infrared absorption spectra to contain, like hydroxylupanine, one hydroxyl group and one carbonyl.

Spectroscopic Studies on Vapour Phase Tautomerism of Natural Bases Found in Nucleic Acids

1978 ◽  
Vol 33 (11-12) ◽  
pp. 876-883 ◽  
Author(s):  
Maciej J. Nowak ◽  
Krystyna Szczepaniak ◽  
Andrzej Barski ◽  
David Shugar
Keyword(s):  
Hydrogen Bonding ◽  
Nucleic Acids ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Equilibrium Constants ◽  
Vapour Phase ◽  
Induced Mutations ◽  
Infrared Absorption Spectra ◽  
Substituted Uracils

Infrared absorption spectra, in the vapour phase, have been recorded in the regions of NH, OH and carbonyl stretching frequencies, for a series of 1-substituted uracils and 9-substituted adenine and hypoxanthine, formal analogues of the natural nucleosides of uracil, adenine and hypoxanthine found in DNA and/or RNA. A number of related analogues was also examined, including the N-methyl derivatives of the known mutagen and chemotherapeutic agent, 5-fluorouracil. The infrared absorption spectra provide unequivocal evidence for the existence of 1-substituted uracils as the 2,4-diketo tautomer, of 9-substituted hypoxanthine as the 6-keto tautomer, and of 9-substituted adenine as the 6-amino tautomer. These are the known predominant tautomeric forms in solution, so that the gas phase results are in sharp contrast with those for other nitrogen heterocycles, where the tautomeric equilibrium constants may differ by several orders of magnitude in going from solution to the vapour phase. The significance of these results is evaluated in relation to the types of heterocyclic bases found in natural nucleic acids, and to concepts of spontaneous and induced mutations in terms of mis-pairing. The ultraviolet absorption spectra of the various compounds have also been examined in the gas phase, but proved of relatively limited use in studies on tautomeric equilibria under these conditions. Heats of vaporization have been determined for most of the compounds examined. In particular the heat of vaporization for 1,3-dimethyluracil, which is incapable of association by hydrogen bonding in the condensed phase, is much lower than for uracil and 1 (3) -methyluracils which can associate by hydrogen bonding.

Vibrational spectra and proposed crystal structure of some tetraphenylarsonium compounds

1970 ◽  
Vol 48 (16) ◽  
pp. 2637-2639 ◽  
Author(s):  
L. K. Walford ◽  
Richard J. Blattner ◽  
Stephen Feldman ◽  
R. L. Bain
Keyword(s):  
Crystal Structure ◽  
Crystal Field ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Vibrational Spectra ◽  
The Other ◽  
X Ray Diffraction ◽  
X Ray ◽  
Unit Cells ◽  
Infrared Absorption Spectra

The crystal structures of (C6H5)4AsBF4, (C6H5)4AsPF6, (C6H5)4AsAsF6, and (C6H5)4AsSbF6 have been studied by X-ray diffraction. The unit cells are all tetragonal. The fluoroborate compound is probably isostructural with (C6H5)4AsFeCl4. The other three compounds are almost isostructural with (C6H5)4AsFeCl4, the only change being the accommodation of the dipyramidal PF6− ion in the space group [Formula: see text] (No. 82). Infrared absorption spectra are in general agreement with previous work on tetraphenylarsonium halides and compounds with hexafluoro Group VA ions. It is concluded that crystal field effects for this series of salts do not markedly affect the vibrational spectra.

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