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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 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0340-4285 1572-901X |
DOI: | 10.1007/s11243-008-9061-3 |