The infrared spectra of oxygen-18 labelled chars

✍ Scribed by R.A. Friedel; R.A. Durie; Y. Shewchyk

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 467 KB
• Volume: 5
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(67)90033-4

✦ Synopsis

As a contribution to the study of the origin of the 1600 cm-' band in the infrared (ir.) spectra of coals and chars the i.r. spectra of the chars from oxygen-18 labelled linoleic acid, benzoic acid, sodium benzoate, and phenol have been investigated. The oxygen content of most of the chars is low (ranging from 0.5 to 3.9%), but all exhibit a strong absorption band near 1600 cm-' in the i.r. spectrum. No frequency shift due to the isotope effect was apparent. These observations appear to suggest that oxygen-containing groups may not be contributing, either directly or indirectly, to the intensity of the 1600 cm-' band. However, final assessment of the implications of these observations must await data on the oxygen isotopic frequency shift in a relevant conjugatively chelated carbonyl system.