Microwave Spectra, Barriers to Internal Rotation of the Methyl Group, and Molecular Electrical Dipole Moments in trans‐ and cis‐1,3‐Pentadiene

1970 ◽  
Vol 52 (3) ◽  
pp. 1053-1057 ◽  
Author(s):  
S. L. Hsu ◽  
W. H. Flygare
Keyword(s):  
Internal Rotation ◽  
Dipole Moments ◽  
Methyl Group ◽  
Electrical Dipole ◽  
Microwave Spectra ◽  
In Trans ◽  
Barriers To Internal Rotation

Microwave Spectra, Barriers to Internal Rotation, and Dipole Moments of cis‐ and trans‐Propylene Phosphine

1970 ◽  
Vol 52 (6) ◽  
pp. 2831-2836 ◽  
Author(s):  
Michael T. Bowers ◽  
Robert A. Beaudet ◽  
Harold Goldwhite ◽  
S. Chan
Keyword(s):  
Internal Rotation ◽  
Dipole Moments ◽  
Microwave Spectra ◽  
Barriers To Internal Rotation ◽  
Cis And Trans

Mikrowellenspektrum und Struktur von Fluortribromsilan und Methyltribromsilan

1968 ◽  
Vol 23 (11) ◽  
pp. 1819-1821 ◽  
Author(s):  
M. Mitzlaff ◽  
R. Holm ◽  
H. Hartmann
Keyword(s):  
Least Squares ◽  
Internal Rotation ◽  
Kcal Mole ◽  
Rotational Constants ◽  
Methyl Group ◽  
Microwave Spectra ◽  
Group A

The microwave spectra of SiFBr3 and CH3SiBr have been investigated in the region from 30 to 40 GHz. Assuming reasonable values for dSi-F, dSi-C and the methyl group a least squares analysis of the rotational constants yieldsdSi-Br ≮Br—Si—BrSiFBr3 (2,171 ± 0,001) A (111,36 ± 0,15)°,CH3SiBr3 (2,175±0,001) A (111,09±0,15)°.A barrier to internal rotation of about 1 kcal/mole is estimated by the intensity method.

High Resolution Microwave Spectroscopy of Ethyl Vinyl Ether: Accurate Determination of the Methyl Top Internal Rotation Barrier

2000 ◽  
Vol 55 (5) ◽  
pp. 481-485 ◽  
Author(s):  
H. Dreizler ◽  
N. Hansen
Keyword(s):  
Internal Rotation ◽  
Vinyl Ether ◽  
Accurate Determination ◽  
Ethyl Vinyl Ether ◽  
Ethyl Vinyl ◽  
Methyl Group ◽  
Rotational Spectra ◽  
Internal Rotation Barrier ◽  
In Trans

Abstract We have performed an investigation of the internal rotation of the methyl group in trans-cis ethyl vinyl ether by using molecular beam-Fourier transform Microwave (MB-FTMW) spectroscopy. Rotational spectra (up to J = 20) were recorded in the frequency region 4-19 GHz. Due to the internal rotation of the methyl group, some rotational transitions were split and the torsional barrier could be determined to V3 (CH3) = 1074.4(4) cm-1 .

Mikrowellenspektrum, Hinderungspotential der internen Rotation und teilweise r0-Struktur des para-Chlortoluols

1967 ◽  
Vol 22 (5) ◽  
pp. 761-764 ◽  
Author(s):  
G. E. Herberich
Keyword(s):  
Internal Rotation ◽  
Structural Parameters ◽  
Rotational Constants ◽  
Methyl Group ◽  
Microwave Spectra ◽  
Isotopic Species ◽  
Nuclear Quadrupole

The rotational microwave spectra of the two chlorine isotopic species of para-chlorotoluene have been measured in the region from 8.4—11.3 GHz. Values for the rotational constants and for the nuclear quadrupole constants have been determined. The barrier to internal rotation of the methyl group is V6 = 13.93 ± 0.04 cal/mole. Two structural parameters have been estimated, namely 1.394 Å for the average ring C — C distance and 1.74 ± 0.01 A for the C — Cl distance.

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