{"title":"Infrared absorption intensities of hexafluorobenzene. Assignment of the 317 cm−1 band","authors":"W.B. Person , D.A. Olsen, J.N. Fordemwalt","doi":"10.1016/0371-1951(66)80218-7","DOIUrl":null,"url":null,"abstract":"<div><p>The infrared intensifies of the two low-frequency fundamentals of hexafluorobenzene have been measured in the vapor phase, and the value of the intensity of the Fermi doublet at 1000 cm<sup>−1</sup> has been checked. The intensity of the 317 cm<sup>−1</sup> band is very low, contrary to the estimate made by STEELE and WHIFFEN. Although both the low-frequency bands show the <em>PQR</em> structure of a parallel vibration, estimation of the <em>PQR</em> spacing expected for this molecule confirms the assignment of the 317 cm<sup>−1</sup> band to the <em>e</em><sub>1<em>u</em></sub> fundamental, ν<sub>20</sub>, made by STEELE and WHIFFEN. The CF bond moments are presented, together with a discussion of the nature of the bond moment hypothesis and an estimate of the vibronic effects to be expected in this molecule.</p></div>","PeriodicalId":101180,"journal":{"name":"Spectrochimica Acta","volume":"22 10","pages":"Pages 1733-1740"},"PeriodicalIF":0.0000,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0371-1951(66)80218-7","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Spectrochimica Acta","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0371195166802187","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
The infrared intensifies of the two low-frequency fundamentals of hexafluorobenzene have been measured in the vapor phase, and the value of the intensity of the Fermi doublet at 1000 cm−1 has been checked. The intensity of the 317 cm−1 band is very low, contrary to the estimate made by STEELE and WHIFFEN. Although both the low-frequency bands show the PQR structure of a parallel vibration, estimation of the PQR spacing expected for this molecule confirms the assignment of the 317 cm−1 band to the e1u fundamental, ν20, made by STEELE and WHIFFEN. The CF bond moments are presented, together with a discussion of the nature of the bond moment hypothesis and an estimate of the vibronic effects to be expected in this molecule.
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