scholarly journals Two equivalent methyl internal rotations in 2,5-dimethylthiophene investigated by microwave spectroscopy

2015 ◽  
Vol 17 (48) ◽  
pp. 32111-32114 ◽  
Author(s):  
Vinh Van ◽  
Wolfgang Stahl ◽  
Ha Vinh Lam Nguyen
Keyword(s):  
Symmetry Group ◽  
Microwave Spectroscopy ◽  
Membered Ring ◽  
Molecular Symmetry ◽  
Internal Rotations ◽  
Labeling Scheme

The dual-rotor problem of a heterocyclic five-membered ring was studied and an insightful labeling scheme for the molecular symmetry group G36 is given.

Analysis of Torsion in a Three-Top Molecule. Torsional Barrier and Moment of Inertia of Trimethyl Ethynyl Germane

1996 ◽  
Vol 51 (4) ◽  
pp. 299-305 ◽  
Author(s):  
K. Voges ◽  
J. Gripp ◽  
H. Hartwig ◽  
H. Dreizler
Keyword(s):  
Internal Rotation ◽  
Ground State ◽  
Molecular Beam ◽  
Rotational Constant ◽  
Rotational Transition ◽  
Microwave Spectroscopy ◽  
Rotational Spectrum ◽  
Molecular Symmetry ◽  
Torsional Barrier ◽  
Symmetry Species

Internal rotation effects for a large number of molecules containing one or two symmetric internal rotors have been investigated using microwave spectroscopy. The high resolution of molecular beam Fourier transform microwave spectroscopy revealed now the internal rotation fine structure in the rotational spectrum of trimethyl ethynyl germane, (CH3)3GeC=CH. After assigning the rotational transition J = 1 → 0 in the vibrational and torsional ground state to the symmetry species of the molecular symmetry group G162 , the torsional barrier V3 and the rotational constant B0 could be determined to (4.5±0.2) kJ/mol and (1823.370±0.010) MHz, respectively.

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