An indirect generation of 1D M^II-2,5-dihydroxybenzoquinone coordination polymers, their structural rearrangements and generation of materials with a high affinity for H₂, CO₂ and CH₄

Abrahams, Brendan F., Dharma, A. David, Dyett, Brendan, Hudson, Timothy A., Maynard-Casely, Helen, Kingsbury, Christopher J., McCormick, Laura J., Robson, Richard, Sutton, Ashley L. and White, Keith F. (2016) An indirect generation of 1D M^II-2,5-dihydroxybenzoquinone coordination polymers, their structural rearrangements and generation of materials with a high affinity for H₂, CO₂ and CH₄. Dalton Transactions, 45 (4), 1339-1344. (doi:10.1039/c5dt04095g).

Abstract

A series of solid-state structural transformations are found to accompany desolvation of relatively simple coordination polymers to yield materials that exhibit unexpected gas sorbing properties. Reaction of 1,2,4,5-tetrahydroxybenzene with M^II salts (M = Mg, or Zn) in an alcohol/water solution in the presence of air affords cis-M^II(C₆H₂O₄^-II)(H₂O)₂·2H₂O·xROH, (M = Mg, or Zn), crankshaft-like chains in which the absolute configurations of the chiral metal centres follow the pattern ⋯Δ Δ Λ Λ Δ Δ Λ Λ⋯, and are hydrogen bonded together to generate spacious channels. When crystals of the crankshaft chain are air dried the crystals undergo a single crystal-to-powder rearrangement to form linear trans-M^II(C₆H₂O₄^-II)(H₂O)₂ chains. Further dehydration yields microporous solids that reversibly sorb H₂, CH₄ and CO₂ with high sorption enthalpies.

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Contributors

Author: Laura J. McCormick

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