Low-Valent Metal Ions as MOF Pillars: A New Route Toward Stable and Multifunctional MOFsClick to copy article linkArticle link copied!
- R. Eric SikmaR. Eric SikmaDepartment of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesMore by R. Eric Sikma
- Naman KatyalNaman KatyalDepartment of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesMore by Naman Katyal
- Su-Kyung LeeSu-Kyung LeeResearch Center for Nanocatalysis, Korea Research Institute of Chemical Technology (KRICT), P.O. Box 107, Yusung, Daejeon 305-600, KoreaMore by Su-Kyung Lee
- Joseph W. FryerJoseph W. FryerAustin-International Framework Undergraduate Exchange Program, College of Natural Sciences, University of Texas at Austin, 120 Inner Campus Drive Stop G2500, Austin, Texas 78712, United StatesMore by Joseph W. Fryer
- Catherine G. RomeroCatherine G. RomeroAustin-International Framework Undergraduate Exchange Program, College of Natural Sciences, University of Texas at Austin, 120 Inner Campus Drive Stop G2500, Austin, Texas 78712, United StatesMore by Catherine G. Romero
- Samuel K. EmslieSamuel K. EmslieDepartment of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesAustin-International Framework Undergraduate Exchange Program, College of Natural Sciences, University of Texas at Austin, 120 Inner Campus Drive Stop G2500, Austin, Texas 78712, United StatesMore by Samuel K. Emslie
- Elinor L. TaylorElinor L. TaylorAustin-International Framework Undergraduate Exchange Program, College of Natural Sciences, University of Texas at Austin, 120 Inner Campus Drive Stop G2500, Austin, Texas 78712, United StatesMore by Elinor L. Taylor
- Vincent M. LynchVincent M. LynchDepartment of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesMore by Vincent M. Lynch
- Jong-San Chang*Jong-San Chang*[email protected]Research Center for Nanocatalysis, Korea Research Institute of Chemical Technology (KRICT), P.O. Box 107, Yusung, Daejeon 305-600, KoreaMore by Jong-San Chang
- Graeme Henkelman*Graeme Henkelman*[email protected]Department of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesMore by Graeme Henkelman
- Simon M. Humphrey*Simon M. Humphrey*[email protected]Department of Chemistry, University of Texas at Austin, 4.428 Welch Hall, 105 E. 24th Street Stop A5300, Austin, Texas 78712-0165, United StatesMore by Simon M. Humphrey
Abstract

PCM-102 is a new organophosphine metal–organic framework (MOF) featuring diphosphine pockets that consist of pairs of offset trans-oriented P(III) donors. Postsynthetic addition of M(I) salts (M = Cu, Ag, Au) to PCM-102 induces single-crystal to single-crystal transformations and the formation of trans-[P2M]+ solid-state complexes (where P = framework-based triarylphosphines). While the unmetalated PCM-102 has low porosity, the addition of secondary Lewis acids to install rigid P–M–P pillars is shown to dramatically increase both stability and selective gas uptake properties, with N2 Brunauer–Emmett–Teller surface areas >1500 m2 g–1. The Ag(I) analogue can also be obtained via a simple, one-pot peri-synthetic route and is an ideal sacrificial precursor for materials with mixed bimetallic MA/MB pillars via postsynthetic, solvent-assisted metal exchange. Notably, the M-PCM-102 family of MOFs contain periodic trans-[P2M]+ sites that are free of counter anions, unlike traditional analogous molecular complexes, since the precursor PCM-102 MOF is monoanionic, enabling access to charge-neutral metal-pillared materials. Four M-PCM-102 materials were evaluated for the separation of C2 hydrocarbons. The separation performance was found to be tunable based on the metal(s) incorporated, and density functional theory was employed to elucidate the nature of the unusual observed sorption preference, C2H2 > C2H6 > C2H4.
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