Abstract
IN previous papers1 we have described measurements on the ultra-violet absorption spectrum of carbon suboxide, and have attempted to calculate the force constants of the linkages in this molecule from the measured normal vibration frequencies. A potential function was employed involving four constants, two of these representing ‘cross-term interactions'. Unfortunately, at the time only the two symmetrical frequencies (υ1 = 843, υ2 = 2,200) were known accurately from the Hainan data, and it was necessary to assume plausible values for the crossterm constants in order to obtain values for the main constants. Lord and Wright2 have now published infra-red data from which the two unsymmetrical frequencies may be deduced (υ3 = 2,290, υ4 = 1,570). We thus have four frequencies and four undetermined constants. Insertion of the values gives kcc = 12·69 × 105, kco = 15·0 × 105, k24 = 5·10 × 105, k13 = 2·43 × 105. k24 and k13 represent C—C—C and O—C—C interactions of the type previously suggested.
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THOMPSON, H., LINNETT, J. Force Constants and Molecular Structure. Nature 140, 1065 (1937). https://doi.org/10.1038/1401065b0
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DOI: https://doi.org/10.1038/1401065b0
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