Pressure-induced neutral-to-ionic transition in an amorphous organic material

Yi Ren, Semin Lee, James M. Christensen, Nikolay V. Plotnikov, Mark Burgess, Todd J. Martínez, Dana D. Dlott, Jeffrey S. Moore

Research output: Contribution to journalArticle


Electron-accepting 11,11,12,12-tetracyano-9,10-anthraquinodimethane (TCAQ) moieties were incorporated covalently into a polymer backbone and added 0.5 mol equiv of electron-donating TTF noncovalently to form DA pairs within the polymer matrix to produce an amorphous mixture of TTF-(pTCAQ)2. TTF (tetrathiafulvalene) was chosen as the electron-donating motif due to its ability to form donor-acceptor (DA) pairs with various electron acceptors that capable of undergoing PINIT (pressure-induced neutral-to-ionic transition). For the electron-accepting motif, TCAQ was chosen due to its high LUMO level and ability to transform from abutterfly-shaped geometry to an aromatic planar-shaped geometry upon accepting two electrons. To synthesize polymers bearing pendant TCAQ motifs, we prepared a methacrylate monomer containing a TCAQ moiety. As the pressure was increased from 2.0 to 5.0 GPa, the absorption bands at 500-800 nm exhibited an increased intensity relative to the absorption peak around 450 nm, which represents the neutral species, suggesting an increase in the ionic species in the blend. The improved processability and tunable composition of TTF-pTCAQ-based DA pairs broadens the available materials capable of pressure-induced electron transfer and can be potentially used as pressure switchable materials accompanied by changes in color, charge fluctuations, magnetism, and dielectric properties.

Original languageEnglish (US)
Pages (from-to)6446-6449
Number of pages4
JournalChemistry of Materials
Issue number18
StatePublished - Jan 1 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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  • Cite this

    Ren, Y., Lee, S., Christensen, J. M., Plotnikov, N. V., Burgess, M., Martínez, T. J., Dlott, D. D., & Moore, J. S. (2016). Pressure-induced neutral-to-ionic transition in an amorphous organic material. Chemistry of Materials, 28(18), 6446-6449.