Vibrational Spectra and Force Constants of Symmetric Tops, IL[1]

1985 ◽  
Vol 40 (10) ◽  
pp. 989-994 ◽  
Author(s):  
Hans Bürger ◽  
Martina Betzel
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Far Infrared ◽  
Force Constants ◽  
Far Infrared Spectra ◽  
Anharmonicity Constants

Fourier Transform far infrared spectra of unstable stannyl chloride, bromide and iodide have been measured in the gas phase with a resolution of 0.04 cm-1. At pressures below 10 mbar, their lifetimes at 0 °C in preconditioned cells were found to be 10-30 min. The v3 fundamentals and hot bands of the series (n + 1)v3 - nv3 have been observed. Rotational J structure has been resolved for monoisotopic samples, and band origins v30, anharmonicity constants x33, ɑ3B and DJ0 values have been determined from the rovibrational analyses. The following v30 values were obtained: H3116Sn35Cl 375.470 (5), H3116Sn37Cl 367.689 (6), H3116Sn79Br 263.566 (5) and H3116SnI 209.759 (6) cm-1.

Hydrogen bonding in the gas phase: the thermodynamic properties of hydrogen fluoride-ether complexes and their far infrared spectra

1971 ◽  
Vol 322 (1548) ◽  
pp. 137-146 ◽  
Keyword(s):  
Hydrogen Bonding ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Methyl Ethyl ◽  
Rotational Contour ◽  
Stretching Vibration ◽  
Conformational Rearrangements ◽  
Far Infrared Spectra

The equilibrium constants of gas-phase complexes of HF with dimethyl, methyl ethyl and diethyl ether have been measured at several temperatures using the Benesi-Hildebrand approximation on the absorption band of the HF stretching vibration in the complex. From these, values of Δ H of — 43, — 38 and — 30 kJ mol -1 respectively, have been determined. They are interpreted in terms of conformational rearrangements of the ethers when they form hydrogen bonds. The far infrared spectra of the complexes with both HF and DF have also been recorded and in each case a band observed at around 180 cm -1 which is assigned to the intermolecular stretching mode of vibration. For the complex between HF and dimethyl ether a rotational contour has been observed at about 10 cm -1 .

The Preparation and Low-Frequency Vibrational Spectra of Some Copper(I) and Silver(I) Alkane- and Arene-monothiolate Complexes

1979 ◽  
Vol 32 (7) ◽  
pp. 1443 ◽  
Author(s):  
GA Bowmaker ◽  
L Tan
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
New Methods ◽  
Thiolate Complexes ◽  
New Compounds ◽  
First Time ◽  
Far Infrared Spectra

A number of different methods for preparing anionic Group 1B metal thiolate complexes have been investigated. The compounds [Me4N] [CU2(SMe)3] and [Et4N] [Ag5(SBut)6] are reported for the first time, and new methods for preparing the previously known compounds [Et4N] [Cu5(SBut)6], [Me4N]2 [CU5(SPh)7] and [Et4N]2 [Cu5(SPh)7] are described. The far-infrared spectra of the above compounds, and of CuSMe, CuSBut, AgSBut, [Me4N]2 [CU4(SPh)6] and [Me4N]2 [Ag5(SPh)7] have been obtained, and metal-sulfur stretching bands are assigned in the 150-350 cm-1 region. The low-frequency Raman spectra have also been obtained for some of these compounds. Possible structures for the new compounds are considered in the light of the low-frequency vibrational spectra.

Far-Infrared Spectra and Vibrational Force Constants of the Ions AuCl4-, AuBr4-, and PtCl42-

1964 ◽  
Vol 3 (12) ◽  
pp. 1775-1776 ◽  
Author(s):  
A. Sabatini ◽  
L. Sacconi ◽  
V. Schettino
Keyword(s):  
Infrared Spectra ◽  
Far Infrared ◽  
Force Constants ◽  
Far Infrared Spectra

Vibrational Spectra and Force Constants of Symmetric Tops, XLIII [1] Fourier Transform Infrared Spectra of Monoisotopic H3GeBr Species in the ν1/ν4 and ν6 Region

1984 ◽  
Vol 39 (9) ◽  
pp. 871-879 ◽  
Author(s):  
H. Bürger ◽  
R. Eujen ◽  
A. Rahner ◽  
P. Schulz ◽  
S. Cradock
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Ground State ◽  
Fourier Transform Infrared ◽  
Force Constants ◽  
Fourier Transform Infrared Spectra ◽  
Weakly Coupled

Fourier transform infrared spectra of the monoisotopic species H374Ge79Br and H374Ge81Br have been recorded in the ν1/ν4 region near 2100 cm-1 with a resolution of 0.015 cm-1 and in the ν6 and 2 ν6 regions near 580 and 1150 cm-1 with a resolution of 0.04 cm-1. Rotational analyses based on ~ 1500, ~1100 and ~ 300 data of ν1/ν4, ν6 and 2 ν6 respectively for each isotopomer have been performed, and ground state and excited state vibrational, rotational and rovibrational parameters have been determined, ν1, 2115.815 0(2)/2115.813 4(2) cm-1, and ν4, 2126.016 5(1) 2126.016 7(1) cm-1 (H374Ge79Br/H374Ge81Br), are weakly coupled by Coriolis x, y resonance, ζ1,4 ≃ - 0.021. ν6, 577.601 2(4)/577.541 7(4) cm-1, and ν4 are affected by / (±2, ±2) resonance. Furthermore, the hot bands (ν1+ν3)-ν3, (ν3+ν4)-ν3, (ν3+ν6)-ν3, 2ν6±2 - ν6±2 and 2ν06 - ν6±1 have been detected and analyzed.

The far-infrared collision-induced spectrum of liquid and near-critical CO2

1985 ◽  
Vol 63 (12) ◽  
pp. 1559-1562 ◽  
Author(s):  
M. J. Clouter ◽  
A. R. W. McKellar
Keyword(s):  
Statistical Theory ◽  
Liquid Phase ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Density Fluctuations ◽  
Saturated Liquid ◽  
Phase Measurements ◽  
Critical Isochore ◽  
Far Infrared Spectra

Far-infrared (15–200 cm−1) absorption spectra of CO2 have been obtained (i) in the super-critical gas at 306 K with densities from 80 to 122 amagat, (ii) in the saturated liquid at 298, 272, and 236 K, and (iii) on the critical isochore in the temperature range 0.02 K < (T – Tc) < 2.0 K. The gas-phase measurements are in agreement with previous work, but an error in previously reported liquid-phase results is revealed. In contrast to the previous measurements of Mannik and Stryland on the ν1 band, the far-infrared spectra showed no measurable effects associated with density fluctuations in the critical region. A simple statistical theory is proposed to account for this result.

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