Sensitization of NIR luminescence of Yb3+ by Zn2+ chromophores in heterometallic complexes with a bridging Schiff-base ligand. Issue 31 (26th July 2017)

• Record Type: Journal Article
• Authors: Pushkarev, Anatoly P.; Balashova, Tatyana V.; Kukinov, Andrey A.; Arsenyev, Maxim V.; Yablonskiy, Artem N.; Kryzhkov, Denis I.; Andreev, Boris A.; Rumyantcev, Roman V.; Fukin, Georgy K.; Bochkarev, Mikhail N.
• Is Part Of: Dalton transactions. Volume 46:Issue 31(2017)
• Page Start: 10408
• Page End: 10417
• Publication Date: 2017-07-26
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt01340j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Herein, heterometallic complexes containing a bridging Schiff-base ligand (H2 L = N, N ′-bis(3-methoxy salicylidene) phenylene-1, 2-diamine) were synthesized. Abstract : Herein, complexes [ZnL]2 (1 ), {(H2 O)Zn(μ-L)Yb[OCH(CF3 )2 ]3 } (2 ), {[(CF3 )2 HCO]Zn(μ-L)Yb[OCH(CF3 )2 ](μ-OH)}2 (3 ), and [(H2 O)Ln2 (L)3 ] (Ln = Yb (4 ) and Gd (5 )) containing a bridging Schiff-base ligand (H2 L = N, N ′-bis(3-methoxy salicylidene)phenylene-1, 2-diamine) were synthesized. The compounds1–4 were structurally characterized. The ytterbium derivatives2–4 exhibited bright NIR metal-centred photoluminescence (PL) of Yb 3+ ion under one- ( λ ex = 380 nm) and two-photon ( λ ex = 750 nm) excitation. The superior luminescence properties of complex2, 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 Yb 3+ 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.