The i.r. spectra of ethynylcyclohexane as a liquid and as amorphous and crystalline solids at 90 K were recorded between 4000 and 50 cm−1. High pressure i.r. spectra of the liquid (1–20 kbar) and crystalline sample were recorded. Raman spectra of the liquid, including semiquantitative polarization measurements, were obtained and the amorphous and crystalline solids studied at 90 K.

The IR spectra of trans-1,4-dicyanocyclohexane as a melt, as a solute in various solvents, as KI and polyethylene pellets and as amorphous and annealed crystalline solids at 90 K have been recorded in the region 4000-50 cm−1. Additional spectra at high pressures (1–50 kbar) have been recorded and the dichroic ratios of oriented polycrystalline films are obtained above 200 cm−1. Raman spectra of the compound as a melt, as an amorphous and crystalline solid at 90 K and dissolved in acetone, chloroform and benzene have also been recorded.

Diskussion der IR‐ und Raman‐Spektren (30‐4000 cm ‐1 ) von kristallinem I 2 O 5 und I 2 O 4 sowie der Raman‐Spektren von (IO) 2 SO 4 und (IO) 2 SeO 4 .

The symmetrical (dichloro, dibromo, diiodo) and unsymmetrical (chlorobromo, chloroiodo and bromoiodo) trans-1,4-dihalocyclohexanes have been studied by infrared and Raman spectroscopy as vapours, melts, in solution, as crystalline compounds at different temperatures and at high pressures (0–50 kbar).

Chemischer InformationsdienstVolume 12, Issue 5 Physical Organic Chemistry ChemInform Abstract: CONFORMATION AND VIBRATIONAL SPECTROSCOPIC STUDY OF FLUOROCYCLOHEXANE S. D. CHRISTIAN, S. D. CHRISTIANSearch for more papers by this authorJ. GRUNDNES, J. GRUNDNESSearch for more papers by this authorP. KLAEBOE, P. KLAEBOESearch for more papers by this authorE. TOERNENG, E. TOERNENGSearch for more papers by this authorT. WOLDBAEK, T. WOLDBAEKSearch for more papers by this author S. D. CHRISTIAN, S. D. CHRISTIANSearch for more papers by this authorJ. GRUNDNES, J. GRUNDNESSearch for more papers by this authorP. KLAEBOE, P. KLAEBOESearch for more papers by this authorE. TOERNENG, E. TOERNENGSearch for more papers by this authorT. WOLDBAEK, T. WOLDBAEKSearch for more papers by this author First published: February 3, 1981 https://doi.org/10.1002/chin.198105056AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. References S. D. CHRISTIAN, J. GRUNDNES, P. KLAEBOE, E. TOERNENG, T. WOLDBAEK, CONFORMATION AND VIBRATIONAL SPECTROSCOPIC STUDY OF FLUOROCYCLOHEXANE, Acta Chem. Scand., Ser. A, 1980, 34, 391. DOI: 10.3891/acta.chem.scand.34a-0391; 10.3891/acta.chem.scand.34a-0391 CASWeb of Science®Google Scholar Volume12, Issue5February 3, 1981 ReferencesRelatedInformation

A force field is derived by the overlay technique, iterating on the 48 assigned fundamentals for the ee and the aa conformers of six trans-1,4-dihalocyclohexanes. Some additional fundamentals of three monohalocyclohexanes (chloro-, bromo- and iodocyclohexane) are used in the iterations. The final force field has 49 independent parameters; it is compatible with the Snyder and Schachtschneider valence force field on n-alkyl chlorides, and is adjusted to more than 600 observed frequencies. Practically all the force constants are common to the ee and aa conformers and the force field can be easily transferred to other substituted cyclohexanes.

Chemischer InformationsdienstVolume 11, Issue 31 Physical Organic Chemistry ChemInform Abstract: THE CONFORMATION AND VIBRATIONAL SPECTRA OF TRANS-1,4-DIHALOCYCLOHEXANES. PART III. TRANS-1,4-DIIODO-, TRANS-1,4-BROMOIODO-, AN TRANS-1,4-DIBROMOCYCLOHEXANE T. WOLDBAEK, T. WOLDBAEKSearch for more papers by this authorP. KLAEBOE, P. KLAEBOESearch for more papers by this author T. WOLDBAEK, T. WOLDBAEKSearch for more papers by this authorP. KLAEBOE, P. KLAEBOESearch for more papers by this author First published: August 5, 1980 https://doi.org/10.1002/chin.198031043AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume11, Issue31August 5, 1980 RelatedInformation

The IR spectra of trans-1,4-diiodo- and trans-1,4-bromoiodocyclohexane as solutes in various solvents, as pellets and as solids under high pressure are recorded in the region 4000–30 cm−1. Additional spectra of the melts, amorphous and annealed crystalline solids at 90 K and dichroic spectra of oriented crystals are recorded above 200 cm−1. Raman spectra of the amorphous and annealed solids at 90 K and as solutes in various solvents, are obtained, including polarization measurements. IR and Raman spectra of trans-1,4-di-bromocyclohexane in the temperature range 90–250 K are recorded. Equilibrium mixtures of ee and aa conformers of the title compounds are observed in solution, in the melts and in the amorphous solid at 90 K. The ee conformer only is present in the stable crystal, while the aa conformer predominates in apparently metastable crystals annealed to ca. 205 K. The concentration of the aa conformer increases under high pressure (50 kbar). Fundamental frequencies for both ee and aa conformers are assigned. A normal coordinate analysis is carried out, and the force Fields adjusted to nine halogenated cyclohexanes using the overlay technique.

Chemischer InformationsdienstVolume 12, Issue 7 Physical Organic Chemistry ChemInform Abstract: THE VIBRATIONAL SPECTRA OF TETRAFLUOROSUCCINIC ANHYDRIDE T. WOLDBAEK, T. WOLDBAEKSearch for more papers by this author T. WOLDBAEK, T. WOLDBAEKSearch for more papers by this author First published: February 17, 1981 https://doi.org/10.1002/chin.198107042AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume12, Issue7February 17, 1981 RelatedInformation

The IR spectra of trans-1,4-chlorobromo- and trans-1,4-chloroiodocyclohexane were recorded in the region 4000–30 cm−1 as solutes in various solvents, as KI and polyethylene pellets and as solids under high pressure (1–50 kbar at ambient temperature). Additional spectra of the melts, amorphous and annealed crystalline solids at 90 K and dichroism of oriented polycrystalline films were obtained above 200 cm−1. Raman spectra of the compounds were recorded in the amorphous and crystalline states at 90 K, and polarization measurements were made in CCl4 CS2 and C6H6 solution.

The diamond anvil cell (DAC) is very convenient for visible-ultraviolet spectroscopic investigations. It has also been employed for Raman spectroscopy, but fluorescence from the diamond windows imposes severe restrictions. When the DAC is used in the infrared region, the low signal/noise ratio of conventional dispersive infrared spectrometers makes it necessary to condense the beam. Most infrared spectra recorded with a 4× or a 6× beam condenser and the DACs in dispersive instruments are of inferior quality, with low resolution and high noise levels. This is due to the small optical aperture of the DAC (typical 0.15 mm when gaskets are used).

The reaction products formed when vinylchloride (chloroethene) at pressures of 6–150 torr and air at room temperature were irradiated by u.v. light from a medium pressure Hg lamp were investigated by the technique of i.r. spectroscopy. Carbon dioxide, carbon monoxide, water, hydrochloric acid, formic acid and acetylene appeared as main reaction products. Various experimental parameters: pressures of vinylchloride and air, irradiation time, frequency region of the irradiating light and the catalytic effects of the alkali halide cell windows affected the reaction rate and their influence was systematically studied. The presence of nitrogen dioxide-nitric oxide (NO2/NO) in the vinylchloride-air mixture greatly increased the reaction rate. At low nitrogen dioxide concentrations (1–5 torr) the same reaction products were formed as in the absence of NO2/NO. Under higher concentrations, however, nitrosyl chloride (NOCl) and nitrous oxide (N2O) were also detected in the spectra.