Luminescence of Salen Lanthanide Bimetallic Complexes: Dual Emission and Energy Transfer

E-ISSN： 1521-3749|641|11|1974-n/a

ISSN： 0044-2313

Source： ZAAC-JOURNAL OF INORGANIC AND GENERAL CHEMISTRY (ELECTRONIC), Vol.641, Iss.11, 2015-09, pp. : 1974-n/a

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Abstract

AbstractThe luminescence properties of the tetranuclear bimetallic lanthanide complexes Sm2Eu2 (1) and Eu2Tb2 (2), were compared with those of the analogous homometallic complexes [Sm4(μ3‐OH)2(salen)2(acac)6(CH3OH)2]·CH3OH (3) and [Eu4(μ3‐OH)2(salen)2(acac)6(CH3OH)2] (4) [H2salen = N, N′‐ethylenebis(salicylideneimine), Hacac = acetylacetonate]. X‐ray crystallographic analysis reveals that complexes 3 and 4 have planar tetranuclear structures. For the Eu2Tb2 configurational isomer, the TbIII ion in complex 2 mainly serves as a sensitizer. The quantum yields and lifetime measurements for 2 support the premise that Ln/Ln energy transfer occurs in such lanthanide bimetallic complexes, along with the usual ligand‐to‐metal triplet energy pathways. Complexes 3 and 4 exhibit the characteristic metal‐centered emission.