STA-27, a porous Lewis acidic scandium MOF with an unexpected topology type prepared with 2,3,5,6-tetrakis(4-carboxyphenyl)pyrazine

Ram Prasad, Sarah Seidner, David Bradford Cordes, Magdalena Lozinska, Daniel M. Dawson, Megan Thompson, Tina Düren, Kristina Chakarova, Mihail Mihaylov, K. Hadjiivanov, Frank Hoffmann, Alexandra Slawin, Sharon Elizabeth Ashbrook, Matt Clarke, Paul Wright

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Abstract

A porous scandium MOF denoted STA-27 (St Andrews Porous Material-27) has been synthesised solvothermally using the 2,3,5,6-tetrakis(4-carboxyphenyl)pyrazine anion (TCPP4-) as the tetratopic carboxylate linker. STA-27 possesses a unique scandium-based 1D rod secondary building unit (SBU) comprising corner-sharing scandium Sc2O11 dimers connected via carboxylate groups from the linker. After activation under mild conditions STA-27 is an active Lewis acidic catalyst, while heating at elevated temperatures results in rupturing of the Sc-O-Sc linkages and a phase transition to a different topological type. Under similar synthesis conditions the smaller Al3+ and Ga3+ cations give isostructural MOFs with a different, previously reported, topology type based on chains of corner-sharing MO4(OH)2 octahedra: the Al-form possesses attractive properties for CO2 adsorption.
Original languageEnglish
Pages (from-to)5685-5701
Number of pages17
JournalJournal of Materials Chemistry A
Volume7
Issue number10
Early online date24 Jan 2019
DOIs
Publication statusPublished - 14 Mar 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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