We report the CO capture properties of an ultramicroporous physisorbent [Ni(WOF)(pyrazine)], WOF-1-Ni, which crystallizes in 4/ ( = 9.91785(6) Å, = 15.71516(9) Å) and its structure is solved using laboratory X-ray powder diffraction. The WOF anion is acentric with polarizable WO bonds offering unique potential properties within a porous structure. Despite isostructural compounds being previously reported, the effect of this distorted anion on CO capture properties has not been studied. In this context, at a 400 ppm partial pressure of CO (applicable for direct air capture), this primitive cubic (pcu) network captures 0.934 mmol g under dry conditions and 0.685 mmol g at 75%RH, the highest capacity for a physisorbent reported to date.
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