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Two-dimensional radial-π-stacks in solution
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DOI：10.1039/d4sc00195h.png)
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Abstract
En 中文
Highly organized pi-aggregate architectures can strongly affect electronic couplings, leading to important photophysical behaviors. With the escalating interest in two-dimensional (2D) materials attributed to their exceptional electronic and optical characteristics, there is growing anticipation that 2D radial-pi-stacks built upon radial pi-conjugation nanorings, incorporating intra- and inter-ring electronic couplings within the confines of a 2D plane, will exhibit superior topological attributes and distinct properties. Despite their immense potential, the design and synthesis of 2D pi-stacks have proven to be a formidable challenge due to the insufficient pi-pi interactions necessary for stable stacking. In this study, we present the successful preparation of single-layer 2D radial-pi-stacks in a solution. Pillar-shaped radially pi-conjugated [4]cyclo-naphthodithiophene diimide ([4]C-NDTIs) molecules were tetragonally arranged via in-plane intermolecular pi-pi interactions. These 2D pi-stacks have a unique topology that differs from that of conventional 1D pi-stacks and exhibit notable properties, such as acting as a 2D template capable of absorbing C60 guest molecules and facilitating the formation of 2D radial-pi-stacks comprising [4]C-NDTI-C60 complexes, rapid exciton delocalization across the 2D plane, and efficient excitation energy funneling towards a trap. We present the formation of 2D radial-pi-stacks, consisting of radial pi-conjugation nanorings in solution, characterized by their distinctive structure and remarkable properties.
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