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Title: High-Pressure Behavior of C2I2 and Polymerization to a Conductive Polymer

Journal Article · · Journal of Physical Chemistry. C
 [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [1]
  1. Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
  2. Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)

Crystalline diiodoacetylene (C2I2) was synthesized and then examined under high-pressure conditions using synchrotron X-ray diffraction, Raman/infrared spectroscopies, and first-principles calculations. At ~0.3 GPa, the starting tetragonal (P$$_{4_{2}}$$/n) phase, which is stabilized by donor-acceptor interactions, changes into a new orthorhombic structure (Cmca) that is more densely packed and analogous to the low-temperature phase of acetylene. Above approximately 4 GPa, compressed C2I2 molecules in the Cmca structure begin to polymerize to form a predominantly sp2 amorphous carbon network that maintains a significant fraction of C-I bonds. Transport measurements demonstrate that the polymeric material is electrically conducting. The magnitude of the electrical conductivity is similar to Br-doped polyacetylene and undoped trans-polyacetylene at 8 GPa and 1 atm, respectively. Elemental analyses performed on recovered samples show that the iodine concentration varies with specific processing conditions. Optimization of the pressure-induced polymerization pathway could allow for enhanced electrical properties to be realized, in addition to postpolymerization functionalization using the weak C-I bonds.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; U.S. Army Research Office (ARO); Defense Advanced Research Projects Agency (DARPA); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; EAR-1634415; FG02-94ER14466
OSTI ID:
1558105
Journal Information:
Journal of Physical Chemistry. C, Vol. 123, Issue 18; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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