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Highly emissive tribenzotriquinacene-based double-rimed nanocube
Nano Research 2023, 16(7): 9584-9590
Published: 19 April 2023
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The study of discrete nanosized cages has gone a long way to seek aesthetically appealing structures and to carry out functional applications. Although the construction of supramolecular cages via a bottom-up self-assembly process has been well developed, the sophisticated synthesis still remains a challenge. Here we report the design and assembly of a giant double-rimed nanocube Zn24LH8, built with 8 tribenzotriquinacene as six-connected vertices and 24 <tpy-Zn2+-tpy> (tpy = terpyridine) connectivities serving as the edges. From the single-crystal structure of tribenzotriquinacene-based ligand LH, the bowl-shaped ligand defines a suitable rigid platform for the spatially well-defined attachment of three sets of parallel vertices, which promotes the quantitative formation of the desired three-dimensional (3D) double-rimed cubic architectures. The formed nanocube Zn24LH8 possesses molecular weight up to 25.6 kDa and side length 5.3 nm. Remarkably, the Zn24LH8 exhibits strong cyan light emission with high luminescence quantum yields in solution and in the solid state based on the inherent cage-confinement induced emission enhancement. By adding orange-emissive Rhodamine B, emission tuning experiments were achieved including white light emission. This work presents a new system for the imitation of complex assemblies and provides a promising candidate for emissive materials.

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