Synthesis, Photo-, and Electrochemistry of Ruthenium Bis(bipyridine) Complexes Comprising a N-heterocyclic Carbene Ligand

Files in This Item:
File Description SizeFormat 
IC_2013_00347r_revsd.pdf970.42 kBAdobe PDFDownload
Title: Synthesis, Photo-, and Electrochemistry of Ruthenium Bis(bipyridine) Complexes Comprising a N-heterocyclic Carbene Ligand
Authors: Leigh, Vivienne
Ghattas, Wadih
Lalrempuia, Ralte
Müller-Bunz, Helge
Pryce, Mary T.
Albrecht, Martin
Permanent link: http://hdl.handle.net/10197/6595
Date: 6-May-2013
Abstract: Analogues of [Ru(bpy)3]2+ were prepared in which one pyridine ligand site is substituted by a N-heterocyclic carbene (NHC) ligand, that is, either by an imidazolylidene with a variable wingtip group R (R = Me, 3a; R = Et, 3b; R = iPr, 3c), or by a benzimidazolylidene (Me wingtip group, 3d), or by a 1,2,3-triazolylidene (Me wingtip group, 3e). All complexes were characterized spectroscopically, photophysically, and electrochemically. An increase of the size of the wingtip groups from Me to Et or iPr groups distorts the octahedral geometry (NMR spectroscopy) and curtails the reversibility of the ruthenium oxidation. NHC ligands with methyl wingtip groups display reversible ruthenium oxidation at a potential that reflects the donor properties of the NHC ligand (triazolylidene > imidazolylidene > benzimidazolylidene). The most attractive properties were measured for the triazolylidene ruthenium complex 3e, featuring the smallest gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) in the series (2.41 eV), a slightly red-shifted absorption profile, and reasonable excited-state lifetime (188 ns) when compared to [Ru(bpy)3]2+. These features demonstrate the potential utility of triazolylidene ruthenium complexes as photosensitizers for solar energy conversion.
Funding Details: European Research Council
Science Foundation Ireland
Type of material: Journal Article
Publisher: American Chemical Society
Copyright (published version): 2013 American Chemical Society
Keywords: Tris(bipyridine)ruthenium(II);Structural analogues;Properties
DOI: 10.1021/ic400347r
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

Show full item record

SCOPUSTM   
Citations 5

53
Last Week
1
Last month
checked on Jun 22, 2018

Page view(s) 50

59
checked on May 25, 2018

Download(s) 50

125
checked on May 25, 2018

Google ScholarTM

Check

Altmetric


This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.