A summary is presented of potential constants for =C= valence-angle bending in a number of linear or quasilinear molecules. It is pointed out that these constants can vary over a wide range, with certain molecules having abnormally low values. One such low value in C3O2 helps to explain the infrared spectrum of that molecule. A very low value in C3, obtained from spectroscopic measurements, is found to conflict with thermodynamic data.
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Pitzer et al. (1964) studied this question.
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