Multifunctional Metal-Organic Frameworks Based on Redox-Active Rhenium Octahedral Clusters

Yulia M. Litvinova, Yakov M. Gayfulin, Konstantin A. Kovalenko, Denis G. Samsonenko, Jan Van Leusen, Ilya V. Korolkov, Vladimir P. Fedin, Yuri V. Mironov

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The redox-active rhenium octahedral cluster unit [Re6Se8(CN)6]4- was combined with Gd3+ ions and dicarboxylate linkers in novel types of metal-organic frameworks (MOFs) that display a set of functional properties. The hydrolytically stable complexes [{Gd(H2O)3}2(L)Re6Se8(CN)6]·nH2O (1, L = furan-2,5-dicarboxylate, fdc; 2, L = thiophene-2,5-dicarboxylate, tdc) exhibit a 3D framework of trigonal symmetry where 1D chains of [{Gd(H2O)3}2(L)]4+ are connected by [Re6Se8(CN)6]4- clusters. Frameworks contain spacious channels filled with H2O. Solvent molecules can be easily removed under vacuum to produce permanently porous solids with high volumetric CO2 uptake and remarkable CO2/N2 selectivity at room temperature. The frameworks demonstrate an ability for reversible redox transformations of the cluster fragment. The orange powders of compounds 1 and 2 react with Br2, yielding dark-green powders of [{Gd(H2O)3}2(L)Re6Se8(CN)6]Br·nH2O (3, L = fdc; 4, L = tdc). Compounds 3 and 4 are isostructural with 1 and 2 and also have permanently porous frameworks but display different optical, magnetic, and sorption properties. In particular, oxidation of the cluster fragment "switches off" its luminescence in the red region, and the incorporation of Br- leads to a decrease of the solvent-accessible volume in the channels of 3 and 4. Finally, the green powders of 3 and 4 can be reduced back to the orange powders of 1 and 2 by reaction with hydrazine, thus displaying a rare ability for fully reversible chemical redox transitions. Compounds 1-4 are mentioned as a new class of redox-active cluster-based MOFs with potential usage as multifunctional materials for gas separation and chemical contamination sensors.

Original languageEnglish
Pages (from-to)2072-2084
Number of pages13
JournalInorganic Chemistry
Volume57
Issue number4
DOIs
Publication statusPublished - 19 Feb 2018

Keywords

  • BRIDGED RE(6)Q(8) Q
  • COORDINATION POLYMERS
  • CARBON-DIOXIDE
  • CRYSTAL
  • HYDRAZINE
  • COMPLEXES
  • SE
  • LUMINESCENCE
  • ADSORPTION
  • OXIDATION

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