Highly NIR-emitting ytterbium complexes containing 2-(tosylaminobenzylidene)-N-benzoylhydrazone anions: structure in solution and use for bioimaging
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chair:
Kovalenko, A. / Pavlov, A. / Ustinovich, I. / Kalyakina, A. / Goloveshkin, A. / Marciniak, L. / Lepnev, L. / Burlov, A. / Schepers, U. / Bräse, S. / Utochnikova, V. (2021)
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place:
Dalton Trans., 2021,50, 3786-3791
- Date: Februar 2021
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Abstract
Solution behaviour in DMSO using 1D and 2D NMR spectroscopy was performed for lanthanide complexes Ln(L)(HL) and Ln(HL)2Cl, containing non-macrocyclic 2-(tosylamino)-benzylidene-N-benzoylhydrazone (H2L), and the structure of [Yb(L)]+ cation in solution was determined. Based on the NMR data, the possibility to obtain novel complexes containing [Ln(L)2]− was predicted, which was successfully synthesized, and the crystal structure of K(C2H5OH)3[Yb(L)2] was determined. Thanks to its high quantum yield of NIR luminescence (1.3 ± 0.2%), high absorption, low toxicity, and the stability of its anion against dissociation in DMSO, K(H2O)3[Yb(L)2] was successfully used for bioimaging.
