Abstract
Two bis-(β-diketonate) ligands [H2L1 = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-butyl-carbazole and H2L2 = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-hexyl-carbazole] were synthesized, and their corresponding dinuclear ruthenium(II) complexes [Ru2(bpy)4(L1)](PF6)2 (1) and [Ru2(bpy)4(L2)](PF6)2 (2) (bpy = 2,2′-bipyridine)] were prepared by the reaction of Ru(bpy)2Cl2 · 2H2O with H2L1 and H2L2 in ethanol, respectively. The structure of the ligand H2L2 was determined by single-crystal X-ray diffraction. The spectral properties of the ligands and their complexes have been studied. The absorption spectra of the complexes exhibit intense ligand-centered bands in the UV region and metal-to-ligand charge-transfer bands in the visible region. The two-photon absorption (TPA) coefficient β and TPA cross-section σ were determined by the Z-scan technique, which revealed that the two complexes exhibit strong TPA due to electronic extensive delocalization. The complexes undergo a reversible or quasi-reversible one-electron metal-centered redox process at E 1/2 = +0.93 V and E 1/2 = +0.92 V, respectively.
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Acknowledgments
This work was supported by a grant for the National Natural Science Foundation of China (50532030), Doctoral Program Foundation of the Ministry of Education of China, the Team of Scientific Innovation Foundation of Anhui Province (2006KJ007TD), Education Committee of Anhui Province (2006KJ032A, 2006KJ135B), Scientific Research & Development Foundation of Hefei University (07KY003ZR).
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Yang, L., Zhao, XH., Zhou, HP. et al. Synthesis, luminescence, and cyclic voltammetric studies of novel binuclear ruthenium(II) complexes prepared from β-diketonate derivatives. Transition Met Chem 33, 431–437 (2008). https://doi.org/10.1007/s11243-008-9061-3
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DOI: https://doi.org/10.1007/s11243-008-9061-3