The codeposition of CH2I2 diluted in argon with 6Li, 7Li, Na, or K atoms produces new infrared absorptions attributable to the alkali iodide and the CH2I free radical. The identity of the radical is confirmed by reacting the CHDI2, CD2I2, and CH2IBr precursors with alkali atoms. Absorptions assigned to the symmetric H–C–H bend, the symmetric C–I stretch, and the out-of-plane hydrogen bend are supported by vibrational analysis. The high C–I force constant (2.81±0.04 mdyn/Å) indicates pi bonding in CH2I.
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Smith et al. (1973) studied this question.
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