Annealing of polyacene-based oligomer synthesized under high pressure

✍ Scribed by Yoshitusgu Kojima; Takaaki Matsuoka; Hideroh Takahashi

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 111 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990110)71:2<289::aid-app12>3.0.co;2-l

✦ Synopsis

A polyacene-based oligomer was synthesized by reaction of diphenyldiacetylene under high pressure (pressure: 0.1 GPa; temperature: 250°C; time: 5 h). Annealing of the polyacene-based oligomer was carried out (temperature: 300 -800°C; time: 5 h). Gas analysis, BET surface area measurement, Raman scattering, X-ray diffraction, elemental analysis, 13 C-NMR, and conductivity measurements were performed to characterize the structure of the product. The oligomer was annealed with the appearance of mainly hydrogen. The H/C of the product decreased with increasing annealing temperature. The Raman band is observed at 1610 cm Ϫ1 assigned to a doubly degenerate deformation vibration of the carbon hexagonal ring. The additional band observed at 1340 cm Ϫ1 is attributed to the size effect. X-ray diffraction indicated that the product had no sharp peak because of the disordered carbon structure.