The infrared and Raman spectra of methoxycarbonyl and thiomethoxycarbonyl isocyanates

1993 ◽  
Vol 71 (10) ◽  
pp. 1627-1631 ◽  
Author(s):  
Walter J. Balfour ◽  
Scott G. Fougere ◽  
Dieter Klapstein ◽  
Werner M. Nau
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Carbonyl Group ◽  
Raman Spectra ◽  
Methyl Groups ◽  
Infrared And Raman Spectra ◽  
Rotational Isomers ◽  
Show Evidence

The gas phase infrared and liquid phase Raman spectra of the title compounds have been recorded and vibrational analyses performed. The spectra show evidence for the presence in both the liquid and vapour phases of two rotational isomers: cisoid-Z and transoid-Z with reference to orientation of isocyanato and methyl groups relative to the carbonyl group.

Infrared and Raman spectra and vibrational assignment of methylene cyclopropane-h6 and -d6

1970 ◽  
Vol 48 (24) ◽  
pp. 3889-3902 ◽  
Author(s):  
J. E. Bertie ◽  
M. G. Norton
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Infrared And Raman Spectra ◽  
Vibrational Assignment ◽  
Isotope Shifts ◽  
Liquid Phases ◽  
Modes Of Vibration ◽  
Depolarization Ratios

Infrared spectra have been recorded in the range 4000 to 20 cm−1 for methylene cyclopropane-h6 and -d6 in the gas phase, and from 4000 to 200 cm−1 for methylene cyclopropane-h6 in the liquid phase. Raman spectra have been recorded for the liquid phases of both species. The fundamental modes of vibration have been assigned using i.r. band contours and Raman depolarization ratios, with the exception of the i.r. inactive A2 modes which were not observed. An interesting feature is the occurrence of remarkably small isotope shifts for certain modes.

Perfluormethyl-Element-Liganden, XI Die Schwingungsspektren von (CF3)2EMn(CO)5 (E=P, As) / Perfluoromethyl Element Ligands, XI. Vibrational Spectra of (CF3)2EMn(CO)5 (E = P, As)

1975 ◽  
Vol 30 (7-8) ◽  
pp. 539-543 ◽  
Author(s):  
Reinhard Demuth ◽  
Joseph Grobe ◽  
Robert Rau
Keyword(s):  
Liquid Phase ◽  
Force Field ◽  
Gas Phase ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate Analysis ◽  
Ir And Raman Spectra ◽  
Normal Coordinate ◽  
Ir And Raman

The gas phase IR and liquid phase IR and Raman spectra of (CF3)2PMn(CO)5 and (CF3)2AsMn(CO)6 have been recorded. The spectra are assigned on the basis of a normal coordinate analysis using a transferred force field.

Infrared and Raman Spectra of Spiropentane-H8

1972 ◽  
Vol 26 (5) ◽  
pp. 540-542 ◽  
Author(s):  
G. R. Burns ◽  
D. G. McGavin
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Gas Phase ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Sufficient Information ◽  
Infrared And Raman Spectra ◽  
Calorimetric Data ◽  
Crystalline Films ◽  
Twist Mode

Infrared and Raman spectra have been measured for spiropentane-H8. Raman spectra for the liquid have enabled the b1 species ring twist to be assigned. Previous assignments of this mode were based on calorimetric data and on the assignment of a band in the infrared spectrum to a combination band involving the ring twist mode. Infrared spectra of low temperature crystalline films have provided sufficient information that, when taken with the Raman data and gas phase infrared spectra, we have assignments for all of the fundamental modes.

The photoelectron spectra and electronic structure of 2-carbonyl furans

1990 ◽  
Vol 68 (5) ◽  
pp. 747-754 ◽  
Author(s):  
Dieter Klapstein ◽  
Charles D. MacPherson ◽  
Robert T. O'Brien
Keyword(s):  
Electronic Structure ◽  
Fine Structure ◽  
Gas Phase ◽  
Carbonyl Group ◽  
Ionization Energy ◽  
Furan Ring ◽  
Photoelectron Spectra ◽  
Energy Bands ◽  
Rotational Isomers ◽  
Inductive Effects

The He(I), λ = 58.4 nm, photoelectron spectra of a series of six 2-carbonyl furans and 2-furonitrile have been measured in the gas phase. The low ionization energy bands are assigned to photoionizations from π orbitals of the furan ring, orbitals localized on the carbonyl group, and orbitals of the carbonyl substituents. Changes in ionization energies within the series can be rationalized in terms of the relative conjugative and inductive effects of the substituents. Substituent inductive effects were found to be dominant. The relatively broad vibrational fine structure on the low IE bands of the carbonyl furans could result from the presence of rotational isomers of the species. Keywords: photoelectron spectra, 2-carbonyl furans, molecular orbitals.

The Infrared and Raman Spectra of α- and β-Pinenes

1976 ◽  
Vol 30 (2) ◽  
pp. 209-212 ◽  
Author(s):  
H. William Wilson
Keyword(s):  
Liquid Phase ◽  
Raman Spectra ◽  
Vapor Phase ◽  
Infrared Spectra ◽  
Infrared And Raman Spectra

The liquid phase infrared and Raman spectra of α-pinene (2,6,6-trimethyl bicyclo[3.1.1] hept-2-ene) and β-pinene (6,6-dimethyl-2-methylene bicyclo [3.1.1] heptane) have been scanned between 100 and 4000 cm−1 and the vapor phase infrared spectra of both compounds between 625 and 4000 cm−1. A number of the 72 allowed modes of the C10H16 isomers can be assigned on the basis of group frequencies.

Infrared and Raman Studies of Ortho- and Meta-Substituted Styrenes

1968 ◽  
Vol 22 (6) ◽  
pp. 650-658 ◽  
Author(s):  
W. G. Fateley ◽  
G. L. Carlson ◽  
F. E. Dickson
Keyword(s):  
Gas Phase ◽  
Raman Spectra ◽  
Spectral Region ◽  
Liquid State ◽  
Infrared And Raman Spectra ◽  
Nitro Derivatives

Infrared and Raman spectra have been obtained over the region 4000 cm−1 to 33 cm−1 on ortho-and meta-substituted styrenes including F, Br, Cl, methyl, and meta-nitro derivatives. The entire spectral region has been investigated in the liquid state while selected regions and isomers have been studied in the solid and gas phase. Gas phase and interferometric spectra in the far ir of ortho-and meta-fluorostyrene did not reveal the torsional modes. Assignment of most fundamental modes of vibrations are reported and discussed.

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