Abstract
Polystyrene film has long been employed as convenient standard for the calibration of infrared spectrometers, especially in the <i>v</i>(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<sup>−1</sup>, the nearest sharp peak being at 1601.4 cm<sup>−1</sup>. The two phenyl overtone peaks at 1944.0 and 1801.6 cm<sup>−1</sup> 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<sup>−1</sup>, because these compounds invariably contain metal-CO groups (<i>v</i>(CO) 2150-1850 cm<sup>−1</sup>). Also, many organometallics of interest contain metal-H and metal-CNR (R = alkyl or aryl) groups, again necessitating a suitable 2000 cm<sup>−1</sup> calibration peak, since both <i>v</i>(M-H) and <i>v</i>(CN) absorb near 2000 cm<sup>−1</sup>. 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.
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