Structure and γ-Ray-Induced Solid-State Polymerization of Sodium Propynoate: Influence of Bilayer Formation on Solid-State Reactivity

✍ Scribed by J.D. Jaufmann; C.B. Case; R.B. Sandor; Bruce M. Foxman

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 297 KB
• Volume: 152
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8686

✦ Synopsis

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 -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 5ve-coordinate, with a square-pyramidal geometry. The 5ve-coordinate local moiety is part of an unusual twodimensional polymer in the crystal bc plane. Crystal packing of the two-dimensional, solid-state polymers leads to a bilayer motif, and the relatively short metal+metal distance of 3.575 A > promotes close packing of the organic tails with parallel acetylene moieties and a very short +C,C+ ' ' '