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Issue 31, 2017
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Sensitization of NIR luminescence of Yb3+ by Zn2+ chromophores in heterometallic complexes with a bridging Schiff-base ligand

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Abstract

Herein, complexes [ZnL]2 (1), {(H2O)Zn(μ-L)Yb[OCH(CF3)2]3} (2), {[(CF3)2HCO]Zn(μ-L)Yb[OCH(CF3)2](μ-OH)}2 (3), and [(H2O)Ln2(L)3] (Ln = Yb (4) and Gd (5)) containing a bridging Schiff-base ligand (H2L = N,N′-bis(3-methoxy salicylidene)phenylene-1,2-diamine) were synthesized. The compounds 1–4 were structurally characterized. The ytterbium derivatives 2–4 exhibited bright NIR metal-centred photoluminescence (PL) of Yb3+ ion under one- (λex = 380 nm) and two-photon (λex = 750 nm) excitation. The superior luminescence properties of complex 2, which was suggested as a marker for NIR bioimaging, were explained via the strong absorption of the 375 nm LMCT state of the ZnL chromophore, efficient energy transfer from ZnL towards Yb3+ through a reversible ligand-to-lanthanide electron transfer process, and absence of luminescence quenchers (C–H and O–H groups) in the first coordination sphere of the rare-earth atom.

Graphical abstract: Sensitization of NIR luminescence of Yb3+ by Zn2+ chromophores in heterometallic complexes with a bridging Schiff-base ligand

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Publication details

The article was received on 13 Apr 2017, accepted on 04 Jul 2017 and first published on 26 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT01340J
Citation: Dalton Trans., 2017,46, 10408-10417
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    Sensitization of NIR luminescence of Yb3+ by Zn2+ chromophores in heterometallic complexes with a bridging Schiff-base ligand

    A. P. Pushkarev, T. V. Balashova, A. A. Kukinov, M. V. Arsenyev, A. N. Yablonskiy, D. I. Kryzhkov, B. A. Andreev, R. V. Rumyantcev, G. K. Fukin and M. N. Bochkarev, Dalton Trans., 2017, 46, 10408
    DOI: 10.1039/C7DT01340J

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