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  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
  • dative bond  (1)
  • 1
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    The microwave and far-infrared spectra of the O-(18)H radical (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Far-infrared laser magnetic resonance (LMR) spectroscopy was used to calculate the frequencies, wavelengths, and line strengths for transitions of O-(18)H molecules at microwave and far-infrared frequencies. In this experiment, a molecular transition frequency is tuned into coincidence with that of a fixed frequency laser by the application of a variable magnetic field. The O-(18)H radicals, detected in natural abundance (0.20 percent), were produced by the reaction of hydrogen atoms with nitrogen dioxide. These data together with microwave frequencies ascertained by Gottlieb, Redford, and Smith (1974) were used to determine the parameters of an effective Hamiltonian. Rotational levels up to J = 5.5 were involved. Results are indicated schematically and the low-lying energy levels of O-(18)H are shown. It is concluded that the frequencies of transitions between levels studied directly in the LMR experiment are reliable.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 305; 513-517
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Gas-solid structure differences in the donor-acceptor complex (CH3)2HN−SO2 (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 533-538 
    Details
    ISSN: 1572-8854
    Keywords: Sulfur dioxide ; dimethylamine ; dative bond ; gas-solid structure difference ; donor — acceptor adduct ; nitrogen — sulfur bond ; Lewis acid-base complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the donor — acceptor adduct (CH3)2HN−SO2 is reported. Crystals of the compound are clear prisms, space group Pna21; at −96°C,a=9.894(1),b=6.051(2),c=16.478(3) Å,D=1.469 g/cm3,V=786.6(5) Å,Z=8. The unit cell contains two crystallographically independent adducts, with N−S bond lengths of 2.015(3) Å and 1.991(3) Å. The average value, 2.00(1) Å is 0.33(4) Å shorter than the 2.34(3) Å value previously determined from microwave spectroscopy of the gas phase species, revealing a large medium effect on the length of the donor — acceptor bond. The structural results are compared with published data for the trimethylamine — SO2 adduct, and discussed in terms of existing experimental and theoretical results for other donor — acceptor systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01668411
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