An anionic silver(i) column containing a novel asymmetric double cage with embedded acetylenediide and unprecedented ??5-ligation of the nitrate ionDedicated to Professor Khi-Rui Tsai (also known as Cai Qirui) on the occasion of his 89th birthday.

The new triple salt (PhCH2NMe3)4[Ag17(C2)2(CF3CO2)16(NO3)(H2O)4] (1) features an asymmetric silver(I) double cage constructed from the edge-sharing of a triangulated dodecahedron and a monocapped square antiprism, and an anionic columnar structure is generated with an unprecedented μ5-ligation mode of the nitrate ion.

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