Spectral, Structural, and Computational Studies of a New Family of Ruthenium(II) Complexes Containing Substituted 1,10-Phenanthroline Ligands and in situ Electropolymerization of a Phenanthrolineruthenium(II) Complex Bridging Nanogap Gold Electrodes
✍ Scribed by Wei Huang; Li Wang; Hirofumi Tanaka; Takuji Ogawa
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 741 KB
- Volume
- 2009
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
The synthesis and spectral and structural characterization of a new family of ruthenium(II) complexes containing 3‐bromo‐, 3,8‐dibromo‐, 3‐(thiophen‐2′,2″‐yl)‐, and 3,8‐(thiophen‐2′,2″‐yl)‐1,10‐phenanthroline (phen) ligands is described. UV/Vis spectroscopy is used to compare the differences between the conjugated π systems in these ligands and their respective [Ru(bpy)~2~]^2+^ (bpy = 2,2′‐bipyridine) analogs. Density functional theory (DFT) computations have been carried out to compare the energy differences between the single‐crystal and the energy‐minimized structures for different conformations (trans/trans, trans/cis and cis/cis) of the thiophene rings and their bonded phen ring. The formation of an oligothiophene semiconductor polymer bridging gold electrodes with a gap of around 25 nm gap from Ru^II^ complex 7 by in situ electropolymerization, and its removal, is monitored by scanning electron microscopy (SEM). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)