Microwave Spectrum of C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Br

Sharbaugh, A. H.; Pritchard, Benjamin S.; Madison, T. C.

doi:10.1103/physrev.77.302

Cited by 16 publications

(5 citation statements)

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“…The structural parameters from the microwave measurements are reported by Sheridan and Gordy [33] and Sharbaugh et a1. (34]. Anderson [35) and Bowen [36] have reported the structural parameters from their electron diffraction measurements.…”

Section: Chlorodibromomethane' (Chcibr2)mentioning

confidence: 99%

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

Kudchadker

1978

Journal of Physical and Chemical Reference Data

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Densities of liquid CH4−a X a (X=Br,I) and CH4−(a+b+c+d)F a CI b Br c I d halomethanesThe availa,ble molecular parameters, fundamental frequencies, and enthalpies of formation at 298.15K (llHr(298}) for halomethanes of the type CH4-(a+b+c+dlFaClr,BrcId have been critically evaluated and recommended values selected. Molecular parameters and llHfO(298) for some halomethanes have been estimated as the experimental values for these compounds are not available. This information has been utilized to calculate the ideal gas thermodynamic properties C;, So, HO-H~,-(Go-H~)/T, llHr, ;lOr, and logKf from o to 1500 K and at a pressure of one atmosphere using the rigid rotor-harmonic oscillator approximation for the following compounds: CHzFBr, T~h h~ If the values for angle YCY in CY:;:W2 ano {l.ngle ZCZ in CZ 2 W2 are available, then LYCZ= 1j2( LYCY + LZCZ). (2) Bond angle XCZ: Very few. values are available for LXCZ in halomethanes having two X atoms. Hence values of LXCZ angles

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Section: Chlorodibromomethane' (Chcibr2)mentioning

confidence: 99%

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

Kudchadker

1978

Journal of Physical and Chemical Reference Data

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“…F distance contributes 66-5 % of the total molecular scattering and largely determines the form of the pattern. The models chosen are shown in table7 and the scattering curves in fig.5together with the visual curve.All the models gave a tolerably good fit, but only those models with LFCF = 108.5" gave complete qualitative agreement with the visual curve. The remaining models wereH .…”

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confidence: 99%

The structures of the trifluoromethyl halides

Bowen¹

1954

Trans. Faraday Soc.

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“…In CHaF, the CH distance is 1.109 A, the CF distance 1.385 J... , and HCH angle 110° 0'. The preliminary results for CFaH (16,27), CFaCI (28), CFaBr (29,30), CFaI (29), and CF3CN (29) indicate a carbon-fluorine distance in each of the molecules of about 1.32 J... Cyclobutane is a planar molecule with the symmetry D4b (33). Spectro scopic data have been interpreted to favor a planar configuration also for octafluorocyclobutane (34,35), although recent work has cast some doubt on the earlier conclusions (36).…”

Section: Structuresmentioning

confidence: 92%

Experimental Molecular Structure

Roth¹

1951

Annu. Rev. Phys. Chem.

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The principal sources of information about the structure of molecules in the free state are electron diffraction of gases, spectroscopy in the infrared, Raman and microwave regions, and x-ray diffraction of crystals. The past year has seen a continuation of the trends noted in the previous review by Beach (1). The general structural principles for most small molecules are reasonably well understood, and interest now is directed toward the under standing of variations of bond distances and angles in different molecules and the study of more complicated systems, such as larger molecules and the nature of intramolecular motions.The advances in experimental technique in electron and x-ray diffraction and the striking interpretations of pure rotational spectra in the microwave region are beginning to provide a body of information relating to interatomic parameters where the distances are reliable to 0.01 'A or better and the angles reliable to 30'. Some success is obtained in accounting for the observed inter atomic distances by modifying the sum of the covalent radii (14) with cor rections for ionic or multiple bond character (18), but it is apparent that there is a need for precise data from a largernumberof molecules. Accordingly, much of the work at the present time is concerned with improving experi mental techniques or with redetermining the structures of many molecules by the newer methods.Electron diffraction.-The need for the determination of a larger number of parameters has led many workers in the field of electron diffraction to search for increased sensitivity and objectivity. The early electron diffraction investigations were accomplished by the visual correlation technique, where calculated intensity patterns based on assumed models were compared with the visually observed diffraction pattern. As the complexity of the molecules studied increased and it became necessary to determine a larger number of parameters, it became increasingly difficult to arrive at a unique model. At the present time, many molecules are being reinvestigated and extensive work is being done to increase the accuracy and sensitivity of the experimen tal techniques.Recent papers by . the Karles (2, 3, 4) and Hastings & Bauer (5, 8) con tain detailed discussions of the effects of various experimental factors on the diffraction patterns: the proper design of a gas nozzle for introducing the sample into the electron beam, the effect of finite sampJe size and divergence of the beam, mUltiple scattering, the use of beam stops and rotating sectors, and the response characteristics of photographic emulsions.1 This review is a continuation of that of Beach (1) and covers approximately the year 19 50.

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Microwave Spectrum of CF3Br

Cited by 16 publications

References 1 publication

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

Ideal gas thermodynamic properties of CH4−(a+b+c+d)FaClbBrcId Halomethanes

The structures of the trifluoromethyl halides

Experimental Molecular Structure

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