Values Of Bond Distances Research Articles

Microwave spectrum of pentafluorobenzonitrile

The absorption spectrum of pentafluorobenzonitrile has been investigated in the frequency range of 18–26·5 GHz using a 100 KHz stark modulated microwave spectrometer. The analysis of the spectrum is based on the rigid asymmetric rotor theory. The rotational constants obtained are A=1026·82±0·3 MHz, B=776·34±0·1 MHz, C=442·06±0·1 MHz and the asymmetry parameterχ=+0·1433. The inertial defect is I o −I a −I b =0·081 amu A2. The bond distances ared CF=1·328 A andd CN=1·157 A. The results are in good agreement with the assumed planarity of the molecule and the normal values of bond distances.

Investigations on the microwave spectrum of meta-di-fluoro-benzene

The microwave spectrum of m-C 6 12H 4F 2 has been measured from 18·0 to 25·0 GHz with wavemeter and frequency standard techniques, using a Stark modulated gas-absorption, microwave spectrometer. The analysis of the spectrum is based on the rigid asymmetric top theory; the rotational constants and the principal moments of inertia were determined and a preliminary structure of the molecule is given. The results are in agreement with the assumed planarity of the molecule and with normal values of bond distances. The rotational constants are: A = 3739·97 ± 0·3 MHz., B = 1734·95 ± 0·1 MHz., C = 1185·48 ± 0·1 MHz. The inertia defect obtained is I c  I a  I b = −0·11 amuA 2.

Electron-Diffraction Study of the Structure and Internal Rotation of Isopropyl Carboxaldehyde

An electron-diffraction study of gaseous isopropyl carboxaldehyde has been carried out for comparison with a parallel study of cyclopropyl carboxaldehyde described in the preceding paper. The isopropyl compound, unlike its cyclic analog, exists in normal trans and gauche rotational isomers. Gauche conformations predominate, accounting for about 90% of the molecules present. Normal values of bond distances and amplitudes of vibration were found and are reported along with other derived molecular parameters. The barrier to rotation was studied and its threefold component was estimated to be in excess of 2 kcal/mole.

Silanes. Vibrational Assignments and Frequency Correlations

Abstract The status of knowledge relative to the vibrational assignments, molecular structure, and spectral data for a series of about one hundred silanes has been surveyed and is reported in brief tabular form. A scheme of simplified vibrational modes is discussed, and used to develop the assignment of fundamentals for some fifty five silanes. Some new assignments are proposed in the light of a correlation rule which has been developed. Tables of characteristic frequencies, and the best values for bond distances, based on this work, are presented.

Effects of bonding on electron diffraction values of bond distances involving hydrogen atoms in solids

Effects of bonding on electron diffraction values of bond distances involving hydrogen atoms in solids