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Keywords:

  • hydrogen;
  • Lewis acids;
  • metal–organic frameworks;
  • polymers;
  • structure elucidation
Thumbnail image of graphical abstract

Charged up: A novel porous coordination polymer with a charged organic surface (COS) comprising a zwitterionic organic linker, viologen, has been synthesized. The COS shows strong Lewis acidity accompanied with flexibility, and the isosteric heat of H2 adsorption is 9.5 kJ mol−1, which is comparable to that of open metal sites (OMSs).