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Unlike most gases, acetylene storage is a challenge because of its inherent pressure sensitivity. Herein, a square lattice ( sql ) coordination network [Cu(4,4'-bipyridine) 2 (BF 4 ) 2 ]  n  ( sql-1-Cu-BF   4  ) is investigated with respect to its C 2 H 2 sorption behavior from 189 to 298 K. The C 2 H 2 sorption studies revealed that sql-1-Cu-BF   4  exhibits multistep isotherms that are temperature-dependent and consistent with the transformation from "closed" (nonporous) to four "open" (porous) phases induced by the C 2 H 2 uptake. The Clausius-Clapeyron equation was used to calculate the performance of sql-1-Cu-BF   4  for C 2 H 2 storage at pressures &gt;1 bar, which revealed that its volumetric working capacity at 288 K is slightly superior to acetone (174 vs 170 cm 3 cm -3 ) over a safer pressure range (1-3.5 vs 1-15 bar). Molecular simulations provided insights into the observed switching phenomena, revealing that the layer expansion of sql-1-Cu-BF   4  occurs via intercalation and inclusion of C 2 H 2 . These results indicate that switching adsorbent layered materials offer promise for utility in the context of C 2 H 2 storage and delivery.

High Working Capacity Acetylene Storage at Ambient Temperature Enabled by a Switching Adsorbent Layered Material