Raman Spectra of Acetylenes IV. Carbon Isotope Effect in Acetylenes

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Abstract
The carbon isotope shift in the frequency near 2200 cm—1 has been calculated for H–C13≡C12–H, CH3–C12≡C13–H, CH3–C13≡C12–H and CH3–C13≡C12–CH3 from the valence force equations, assuming a four‐mass, linear oscillator. The results were —27, —26, —50 and —33.5 cm—1, respectively. Weak lines which may correspond to isotope shifts were observed for the monosubstituted acetylenes, 1‐heptyne (—21 and —53 cm—1), 4‐methoxy‐1‐butyne (—24 and —53) and phenylethyne (—24 and —54), and for the disubstituted acetylenes, 1‐phenyl‐1‐butyn‐3‐one (—37), 1‐phenyl‐1‐butynol‐3 (—33), 1‐phenyl‐1‐butyne (—29), 3‐hexyne (—26), 3‐octyne (—36) and 5‐decyne (—38 cm—1). Shifts of —27 and —33 cm—1 for acetylene and dimethylacetylene, respectively, have been reported by Glockler and Renfrew.

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