Synthesis, structures and luminescent properties of new heterobimetallic Zn-4f Schiff base complexes |
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Authors: | Wing-Kit Lo Jianping Guo King-Fai Li |
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Affiliation: | a Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, PR China b Department of Physics and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, PR China |
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Abstract: | A series of new 3d-4f heterobimetallic Schiff base complexes of the general formula [Zn(μ-L2)Ln(NO3)3(H2O)n] (Ln = La 1, Nd 2, Gd 3, Er 4 and Yb 5; n = 1 or 2; H2L2 = N,N′-bis(3-methoxy-5-p-tolylsalicylidene)ethylene-1,2-diamine) are synthesized and characterized. Complexes 1, 2, 4 and 5 are structurally characterized by X-ray crystallography. The photophysical properties of these complexes are also investigated. At room temperature, complexes 1-5 exhibit similar solution absorption and emission spectra in the UV-Vis region. Furthermore, compounds 2, 4 and 5 exhibit solution emission corresponding to the lanthanide(III) ion in the near-infrared region at room temperature. The triplet state emission of the 3d-4f bimetallic complexes without energy transfer is also determined through the photophysical study of complex 3. |
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Keywords: | Heterobimetallic complexes Lanthanide Luminescence Schiff bases Zinc |
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