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Issue 14, 2014
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New lanthanide–CB[6] coordination compounds: relationships between the crystal structure and luminescent properties

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Abstract

The reaction between cucurbit[6]uril (CB[6]) and lanthanide chlorides (Eu, Sm, Tb and Tm) in acidic aqueous media led to four new structures. The compounds obtained are isostructural with general formula [Ln2(H2O)12(H2O@CB[6])]Cl6(H2O)4 (Ln = Eu3+ (1), Sm3+ (2), Tb3+ (3) and Tm3+ (4)) and crystallize in the P21/c space group. For the complexes with Eu3+, Sm3+ and Tb3+, the luminescent properties in the solid state and aqueous media were explored and all spectroscopic observations are in excellent agreement with the single crystal structure data. The excitation and emission spectra show the typical f–f transitions characteristic of the trivalent lanthanide ions. The transitions 7FJ5D1 (J = 0,1,2) in the europium compound and 7FJ5D4 (J = 0,1,2) in the terbium compound, not yet reported in lanthanide–CB[n] compounds, were also observed.

Graphical abstract: New lanthanide–CB[6] coordination compounds: relationships between the crystal structure and luminescent properties

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Publication details

The article was received on 26 Sep 2013, accepted on 02 Jan 2014 and first published on 03 Jan 2014


Article type: Paper
DOI: 10.1039/C3DT52687A
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 5435-5442
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    New lanthanide–CB[6] coordination compounds: relationships between the crystal structure and luminescent properties

    F. F. da Silva, C. A. F. de Oliveira, E. H. L. Falcão, J. Chojnacki, J. L. Neves and S. Alves, Dalton Trans., 2014, 43, 5435
    DOI: 10.1039/C3DT52687A

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