Influence of thermally induced structural transformations on the magnetic and luminescence properties of tartrate-based chiral lanthanide organic-frameworks

Alessio Terenzi, Eider San Sebastian, Antonio Rodríguez-Diéguez, Alessio Terenzi, Javier Cepeda, Jose Angel García, Jose Angel García, Carlos M. Cruz, Andoni Zabala-Lekuona, Jose Angel García, José M. Seco, Uxua Huizi-Rayo, Jose Angel García, Juan M. Cuerva

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4 Citations (Scopus)

Abstract

This work reports on the synthesis and characterization of five enantiomeric pairs of isostructural 3D metal-organic frameworks (MOFs) with the general formula {[Ln2(μ4-tar)2(μ-tar)(H2O)2]·xH2O}n [where Ln(iii) = Tb (Tb-L and Tb-D), Dy (Dy-L and Dy-D), Ho (Ho-L and Ho-D), Er (Er-L and Er-D) and Tm (Tm-L and Tm-D); tar = tartrate (d- or l-) and x = 3 or 4 depending on the counterpart], which possess interesting luminescence and magnetic properties. These MOFs undergo progressive and reversible dehydration processes upon controlled heating yielding three crystalline phases (Ln-L′, Ln-L′′ and Ln-L′′′). Alternating current magnetic measurements on Tb, Dy and Er-based compounds exhibit field induced single-molecule magnet behavior dominated by QTM, which is partially suppressed when diluted on a Y-based matrix. Tartrate ligands show poor room temperature sensitization of Tb and Dy centers that is enhanced at low temperature (10 K), even enabling weak Tm-based emission. More interestingly, the dehydration modulates both magnetic and photoluminescence properties on the basis of both the distortions occurring in the coordination shells and a decrease of water molecules acting as quenchers, respectively, endowing these materials with potential humidity sensing capacity. Remarkably, the Tb-based MOF shows circularly polarized luminescence (CPL), being one of the examples of this very scarce family of CPL emitters reported so far. This journal is
Original languageEnglish
Pages (from-to)8243-8256
Number of pages14
JournalJOURNAL OF MATERIALS CHEMISTRY. C
Volume8
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Materials Chemistry

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