Two-photon excited deep-red and near-infrared emissive organic co-crystals

Yu Wang, Huang Wu, Penghao Li, Su Chen, Leighton O. Jones, Martín A. Mosquera, Long Zhang, Kang Cai, Hongliang Chen, Xiao-Yang Chen, Charlotte L. Stern, Michael R. Wasielewski, Mark A. Ratner, George C. Schatz and J. Fraser Stoddart ()
Additional contact information
Yu Wang: Northwestern University
Huang Wu: Northwestern University
Penghao Li: Northwestern University
Su Chen: Northwestern University
Leighton O. Jones: Northwestern University
Martín A. Mosquera: Northwestern University
Long Zhang: Northwestern University
Kang Cai: Northwestern University
Hongliang Chen: Northwestern University
Xiao-Yang Chen: Northwestern University
Charlotte L. Stern: Northwestern University
Michael R. Wasielewski: Northwestern University
Mark A. Ratner: Northwestern University
George C. Schatz: Northwestern University
J. Fraser Stoddart: Northwestern University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Two-photon excited near-infrared fluorescence materials have garnered considerable attention because of their superior optical penetration, higher spatial resolution, and lower optical scattering compared with other optical materials. Herein, a convenient and efficient supramolecular approach is used to synthesize a two-photon excited near-infrared emissive co-crystalline material. A naphthalenediimide-based triangular macrocycle and coronene form selectively two co-crystals. The triangle-shaped co-crystal emits deep-red fluorescence, while the quadrangle-shaped co-crystal displays deep-red and near-infrared emission centered on 668 nm, which represents a 162 nm red-shift compared with its precursors. Benefiting from intermolecular charge transfer interactions, the two co-crystals possess higher calculated two-photon absorption cross-sections than those of their individual constituents. Their two-photon absorption bands reach into the NIR-II region of the electromagnetic spectrum. The quadrangle-shaped co-crystal constitutes a unique material that exhibits two-photon absorption and near-infrared emission simultaneously. This co-crystallization strategy holds considerable promise for the future design and synthesis of more advanced optical materials.

Date: 2020
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DOI: 10.1038/s41467-020-18431-7

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