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Natural carbyne-like structures (linear end-capped polyynes) occur in space and in certain biological objects. The synthetically demonstrated species contain up to 30–300 carbon atoms; even longer chains should be accessible by electrochemical defluorination of PTFE. Cathodic carbonization of perfluorinated hydrocarbons with alkali metal (MLi, Na, K) amalgams gives a solid composite of n-doped elemental...
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