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 Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, P.M.B. X1314, Alice 5700, South Africa 2 Department of Chemistry, Faculty of Science, Rhodes University, P.M.B. 94, Grahamstown 6140, South Africa 3 Department of Chemistry, Faculty of Science, University of Lagos, Akoka, Lagos State, Nigeria
* Author to whom correspondence should be addressed.
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)
PDF Full-text Download PDF Full-Text [594 KB, uploaded 14 March 2012 11:32 CET]
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

Supplementary Files

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

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.

Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert