Temperature Switch of LMCT Role: From Quenching to Sensitization of Europium Emission in a ZnII−EuIII Binuclear Complex

Temperature Switch of LMCT Role: From Quenching to Sensitization of Europium Emission in a ZnII−EuIII Binuclear Complex

The synthesis, structural investigation, and photophysical properties of a new heterobinuclear complex, [Zn(H2O)(valpn)Eu(NO3)3], are reported [H2valpn = 1,3-propanediylbis(2-iminomethylene-6-metoxy-phenol)]. In the absence of the antenna-type sensitization of europium emission at room temperature,...

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Veröffentlicht in:Inorganic chemistry 2010-03, Vol.49 (5), p.2310-2315
Hauptverfasser: Pasatoiu, Traian D, Madalan, Augustin M, Kumke, Michael U, Tiseanu, Carmen, Andruh, Marius
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container_issue 5
container_start_page 2310
container_title Inorganic chemistry
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creator Pasatoiu, Traian D
Madalan, Augustin M
Kumke, Michael U
Tiseanu, Carmen
Andruh, Marius
description The synthesis, structural investigation, and photophysical properties of a new heterobinuclear complex, [Zn(H2O)(valpn)Eu(NO3)3], are reported [H2valpn = 1,3-propanediylbis(2-iminomethylene-6-metoxy-phenol)]. In the absence of the antenna-type sensitization of europium emission at room temperature, the strongest metal-centered emission was obtained following excitation into the 7F0−5D2 transition at 535 nm. In contrast, at 80 K, the strongest emission of europium was obtained by exciting into the maximum of a high-intensity, low-lying ligand-to-metal charge-transfer band (LMCT) located at ∼425 nm. The overall temperature-induced changes of the photophysical properties of europium were assigned to the relative location of the LMCT and 3ππ* ligand states to the europium excited levels. The results may explain the lack of the antenna effects reported for some of the europium complexes with this type of ligand.
doi_str_mv 10.1021/ic902169s
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In the absence of the antenna-type sensitization of europium emission at room temperature, the strongest metal-centered emission was obtained following excitation into the 7F0−5D2 transition at 535 nm. In contrast, at 80 K, the strongest emission of europium was obtained by exciting into the maximum of a high-intensity, low-lying ligand-to-metal charge-transfer band (LMCT) located at ∼425 nm. The overall temperature-induced changes of the photophysical properties of europium were assigned to the relative location of the LMCT and 3ππ* ligand states to the europium excited levels. 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