Organic Vapor Sorption in a High Surface Area Dysprosium(III)–Phosphine Oxide Coordination Material

PCM-16 is a phosphine coordination material comprised of Dy­(III) and triphenylphosphine oxide, which displays the highest reported CO₂ BET surface area for a Ln­(III) coordination polymer of 1511 m² g^–1. PCM-16 also adsorbs 2.7 wt % H₂ and 65.1 wt % O₂ at 77 K and 0.97 bar. The adsorption–desorption behavior of a series of organic vapors has been studied in PCM-16 to probe the nature of certain host–guest interactions in the pores. Aromatic and polar guest species showed high uptakes and marked adsorption/desorption hysteresis, while aliphatic vapors were less easily adsorbed. The surface area of PCM-16 could be increased significantly (to 1814 m² g^–1) via exchange of Me₂NH₂⁺ cations in the pores with smaller NH₄⁺ groups.