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Int. J. Mol. Sci. 2012, 13(3), 3511-3526; doi:10.3390/ijms13033511
Article

A High Molar Extinction Coefficient Bisterpyridyl Homoleptic Ru(II) Complex with trans-2-Methyl-2-butenoic Acid Functionality: Potential Dye for Dye-Sensitized Solar Cells

1,* , 2
, 3
 and 1
Received: 16 January 2012; in revised form: 25 February 2012 / Accepted: 6 March 2012 / Published: 14 March 2012
(This article belongs to the Section Material Sciences and Nanotechnology)
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Abstract: In our continued efforts in the synthesis of ruthenium(II) polypyridine complexes as potential dyes for use in varied applications, such as the dye-sensitized solar cells (DSSCs), this work particularly describes the synthesis, absorption spectrum, redox behavior and luminescence properties of a new homoleptic ruthenium(II) complex bearing a simple trans-2-methyl-2-butenoic acid functionality as the anchoring ligand on terpyridine moiety. The functionalized terpyridine ligand: 4’-(trans-2-methyl-2-butenoic acid)-terpyridyl (L1) was synthesized by aryl bromide substitution on terpyridine in a basic reaction condition under palladium carbide catalysis. In particular, the photophysical and redox properties of the complex formulated as: bis-4’-(trans-2-methyl-2-butenoic acid)-terpyridyl ruthenium(II) bis-hexafluorophosphate [Ru(L1)2(PF6)2] are significantly better compared to those of [Ru(tpy)2]2+ and compare well with those of the best emitters of Ru(II) polypyridine family containing tridentate ligands. Reasons for the improved photophysical and redox properties of the complex may be attributed partly to the presence of a substituted α,β-unsaturated carboxylic acid moiety leading to increase in the length of π-conjugation bond thereby enhancing the MLCT-MC (Metal-to-ligand-charge transfer-metal centred) energy gap, and to the reduced difference between the minima of the excited and ground states potential energy surfaces.
Keywords: homoleptic Ru(II) complex; terpyridine; 2-Methyl-2-butenoic acid; extended-π-bond conjugation; spectroscopy; molar extinction coefficient; electrochemistry homoleptic Ru(II) complex; terpyridine; 2-Methyl-2-butenoic acid; extended-π-bond conjugation; spectroscopy; molar extinction coefficient; electrochemistry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Adeloye, A.O.; Olomola, T.O.; Adebayo, A.I.; Ajibade, P.A. A High Molar Extinction Coefficient Bisterpyridyl Homoleptic Ru(II) Complex with trans-2-Methyl-2-butenoic Acid Functionality: Potential Dye for Dye-Sensitized Solar Cells. Int. J. Mol. Sci. 2012, 13, 3511-3526.

AMA Style

Adeloye AO, Olomola TO, Adebayo AI, Ajibade PA. A High Molar Extinction Coefficient Bisterpyridyl Homoleptic Ru(II) Complex with trans-2-Methyl-2-butenoic Acid Functionality: Potential Dye for Dye-Sensitized Solar Cells. International Journal of Molecular Sciences. 2012; 13(3):3511-3526.

Chicago/Turabian Style

Adeloye, Adewale O.; Olomola, Temitope O.; Adebayo, Akinbulu I.; Ajibade, Peter A. 2012. "A High Molar Extinction Coefficient Bisterpyridyl Homoleptic Ru(II) Complex with trans-2-Methyl-2-butenoic Acid Functionality: Potential Dye for Dye-Sensitized Solar Cells." Int. J. Mol. Sci. 13, no. 3: 3511-3526.


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