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Synthesis, luminescence, and cyclic voltammetric studies of novel binuclear ruthenium(II) complexes prepared from β-diketonate derivatives

Two bis-(β-diketonate) ligands [H 2 L 1  = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-butyl-carbazole and H 2 L 2  = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-hexyl-carbazole] were synthesized, and their corresponding dinuclear ruthenium(II) complexes [Ru 2 (bpy) 4 (L 1 )](PF 6 ) 2 ( 1 ) and [Ru...

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Published in:Transition metal chemistry (Weinheim) 2008-05, Vol.33 (4), p.431-437
Main Authors: Yang, Lin, Zhao, Xiang-Hua, Zhou, Hong-Ping, Wu, Jie-Ying, Yang, Jia-Xiang, Shao, Guo-Quan, Tian, Yu-Peng
Format: Article
Language:English
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Summary:Two bis-(β-diketonate) ligands [H 2 L 1  = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-butyl-carbazole and H 2 L 2  = 3,6-bis-(4,4,4-trifluorobutane-1,3-dione)-9-hexyl-carbazole] were synthesized, and their corresponding dinuclear ruthenium(II) complexes [Ru 2 (bpy) 4 (L 1 )](PF 6 ) 2 ( 1 ) and [Ru 2 (bpy) 4 (L 2 )](PF 6 ) 2 ( 2 ) (bpy = 2,2′-bipyridine)] were prepared by the reaction of Ru(bpy) 2 Cl 2  · 2H 2 O with H 2 L 1 and H 2 L 2 in ethanol, respectively. The structure of the ligand H 2 L 2 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.
ISSN:0340-4285
1572-901X
DOI:10.1007/s11243-008-9061-3