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As(lone pair)⋯π interactions provide stability to their crystal structures often leading to supramolecular chains and prevailing over As⋯X secondary contacts. The interaction (ca 8 kJ mol−1) arises from polarisation induced in the aryl ring by the As-lone pair plus the weak sharing of these electrons with the ring-C atoms.

Graphical abstract: Supramolecular architectures based on As(lone pair)⋯π(aryl) interactions

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