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Wang, Yu; Wu, Huang; Li, Penghao; Chen, Su; Jones, Leighton O; Mosquera, Martín A; Zhang, Long; Cai, Kang; Chen, Hongliang; Chen, Xiao-Yang; Stern, Charlotte L; Wasielewski, Michael R; Ratner, Mark A; Schatz, George C; Stoddart, J Fraser
Nature communications, 09/2020, Letnik: 11, Številka: 1Journal Article
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.
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