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• W2990099111 abstract "Herein, we report the synthesis and characterization of heterobimetallic Zn‐4f complexes formed by the “valnap” ligand ( L 1 ) with extended aromaticity, thereby acting as visibly absorbing antenna for generating the near‐infrared (NIR) luminescence of three different lanthanide(III) ions (Ln 3+ ). The series of new Zn(py)L 1 Ln(NO 3 ) 3 complexes [Ln = Yb ( 1 ), Nd ( 2 ), Er ( 3 )] have been characterized by single‐crystal X‐ray diffraction and were found to be isotypic, with a variation in the Ln 3+ coordination number (CN = 9–11) in line with increasing atomic radius. Absorption spectra recorded for L 1 , ZnL 1 , and complexes 1 – 3 display ligand‐based absorption bands in the UV ( λ max ≈ 320 nm) and visible regions ( λ max ≈ 430 nm) with molar absorption coefficients up to 6.3 × 10 4 and 3.9 × 10 4 m – 1 cm –1 , respectively. Upon excitation into ligand‐centered absorption bands in the visible range, characteristic NIR emission signals of Yb 3+ ( 1 ), Nd 3+ ( 2 ), and Er 3+ ( 3 ) have been obtained. Quantum yields measured under visible excitation at 430 nm (Q Ln L ) and observed luminescence lifetimes ( τ obs ) reflecting the excited states attributed to the 2 F 5/2 (Yb 3+ ), 4 F 3/2 (Nd 3+ ) and 4 I 13/2 (Er 3+ ) levels have been determined. These data quantifying the luminescence properties of this family of complexes and absorption bands in the visible range with large molar absorption coefficients make complexes 1 – 3 of potential interest for biological applications where UV light is inappropriate." @default.
• W2990099111 created "2019-12-05" @default.
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• W2990099111 date "2019-12-19" @default.
• W2990099111 modified "2023-10-18" @default.
• W2990099111 title "Near‐Infrared Emitting Heterobimetallic Zn‐4f Schiff Base Complexes with Visible Excitation Wavelength" @default.
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• W2990099111 doi "https://doi.org/10.1002/ejic.201901042" @default.
• W2990099111 hasPublicationYear "2019" @default.
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