Prospective Electronic Materials
from ADA stacks

ADA stacks can undergo a unique neutral-ionic phase transition, a phase change property that leads to ferroelectrics. The potential application as flexible ferroelectrics entails much research endeavor towards the development of solid-state ADA stacks, which remain very scarce in the literature.

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Assembly of ADA stacks from solid state grinding.
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We have shown a unique host-guest system that rapidly leads to extended 1D alternating donor-acceptor (ADA) stacks, which hold great promises as transporting semiconductng materials and ferroelectric materials. The 1:2 complex can be obtained as a precipitate from solution within minutes or, more remarkably, from a solid-to-solid mechanical grinding process. The ADA stacking was confirmed by single crystal and powder XRD analysis and further characterized by solid-state CPMAS 13C and 15N NMR spectroscopy. Current findings not only provide a convenient way to a novel class of ADA stacks involving macrocyclic host, but also represent an important step in transferring electro-active host-guest systems from solution to the solid state.

Another approach towards such class of ferroelectric materials is to assemble discotic donors and acceptors with reverse electronic properties. The liquid crystallinity of the donor-acceptor pair can be tuned to increase ordering in thin films. Overall, related ferroelectric properties and their application in organic nonvolatile memories will be investigated.

Koshkakaryan, G.; Klivansky, L. M.; Cao, D.; Snauko, M.; Teat, S. J.; Struppe, J. O.;
Liu, Y.* “Alternative Donor-Acceptor Stacks from Crown Ethers and Naphthalene Diimide Derivatives: Rapid, Selective Formation from Solution and Solid State Grinding”, J. Am. Chem. Soc. 2009, 131, 2078-2079.

Dr. Simon Teat, Advanced Light Source