Microporosity of a guanidinium organodisulfonate hydrogen-bonded framework

Brekalo, Ivana ; Deliz, David E. ; Barbour, Leonard J. ; Ward, Michael D. ; Friščić, Tomislav ; Holman, Travis (2019-10-29)

CITATION: Brekalo, I. et al. 2020. Microporosity of a Guanidinium Organodisulfonate Hydrogen-Bonded Framework. Angewandte Chemie, 59(5):1997-2002. doi:10.1002/anie.201911861

The original publication is available at https://onlinelibrary.wiley.com/journal/15213757


Guanidinium organosulfonates (GSs) are a large and well-explored archetypal family of hydrogen-bonded organic host frameworks that have, over the past 25 years, been regarded as nonporous. Reported here is the only example to date of a conventionally microporous GS host phase, namely guanidinium 1,4-benzenedisulfonate (p-G2BDS). p-G2BDS is obtained from its acetone solvate, AcMe@G2BDS, by single-crystal-to-single-crystal (SC-SC) desolvation, and exhibits a Type I low-temperature/pressure N2 sorption isotherm (SABET=408.7(2) m2 g−1, 77 K). SC-SC sorption of N2, CO2, Xe, and AcMe by p-G2BDS is explored under various conditions and X-ray diffraction provides a measurement of the high-pressure, room temperature Xe and CO2 sorption isotherms. Though p-G2BDS is formally metastable relative to the “collapsed”, nonporous polymorph, np-G2BDS, a sample of p-G2BDS survived for almost two decades under ambient conditions. np-G2BDS reverts to zCO2@p-G2BDS or yXe@p-G2BDS (y,z=variable) when pressure of CO2 or Xe, respectively, is applied.

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