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Sodium propynoate, Na(O 2 CC≡CH) 1, was synthesized from propynoic acid and sodium hydroxide in methanol solution. Irradiation of solid 1 with 60 Co γ-rays (654 kGy dose) leads to an amorphous dark-colored acetylenic polymer in high yield. An X-ray structure determination of compound 1 shows that the sodium ion is five-coordinate, with a square-pyramidal geometry. The five-coordinate...
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