The absorption spectra of the gaseous olefin-TCNE complexes were successfully observed for the first time: the absorption maximum of the butene-TCNE complex was found at 28700 cm−1. The CT band of the methyl derivatives was shifted to a higher-energy region because of their steric effect. The systematic collection of the gaseous data made it possible to estimate the magnitude of the steric effect.
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Aihara et al. (1970) studied this question.
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