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    Microporosity of a Guanidinium Organodisulfonate Hydrogen‐Bonded Framework

    Pores now found! The porous polymorph of guanidinium 1,4‐benzenedisulfonate, G2BDS, one of the simplest members of an archetypal class of hydrogen‐bonded frameworks, was prepared from its acetone solvate by single‐crystal‐to‐single‐crystal (SC‐SC) desolvation. The persistent porosity, phase behavior, and gas sorption characteristics are described.

    Abstract

    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.

    …read more

    Source:: Angewandte Chemie Int. edition

          

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