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Polystyrene Film Embedded with Chromium Hexacarbonyl: A Useful 2000 cm1 Calibration Standard for the Infrared Spectra of Organometallic Complexes

Volume 38, Number 4 (Aug. 1984) Page 601-602

Butler, Ian S.; Shaver, Alan; Fong, Bertwin; Eisenberg, Adi


Polystyrene film has long been employed as convenient standard for the calibration of infrared spectrometers, especially in the v(CH) and fingerprint regions, because of its innumerable, strong, sharp, well-resolved peaks. Unfortunately, these films are not universally useful; in particular, there are no suitable calibration peaks around 2000 cm−1, the nearest sharp peak being at 1601.4 cm−1. The two phenyl overtone peaks at 1944.0 and 1801.6 cm−1 are considered too broad to be useful. This situation is especially frustrating for organometallic chemists, who routinely monitor the infrared spectra of their compounds at ~2000 cm−1, because these compounds invariably contain metal-CO groups (v(CO) 2150-1850 cm−1). Also, many organometallics of interest contain metal-H and metal-CNR (R = alkyl or aryl) groups, again necessitating a suitable 2000 cm−1 calibration peak, since both v(M-H) and v(CN) absorb near 2000 cm−1. Gaseous CO and DCl are sometimes used as calibrants for, this region, but this entails the purchasing and handling of a fairly expensive and fragile gas cell. A better solution would be to have a readily available, cheap, rugged standard.