Surface-active mononuclear and dinuclear Ru(II) complexes based on thio-substituted terpyridines bearing cyclodextrin recognition units
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Colleges, School and Institutes
Ruthenium(II) surface active complexes based on a tpySH ligand have been prepared and characterised, (1) [Ru(tpyada)(tpySH)](PF6)2, (2) [Ru(biptpy)(tpySH)](PF6)2 and (3) [Ru(pm-β-CD(ttp))(tpySH)](PF6)2. The complexes bear a surface active thiol group and a recognition unit which is either a β-cyclodextrin or a hydrophobic tail (adamantyl- or biphenyl) in order to utilise cyclodextrin recognition for the formation of supramolecular wires using bottom up approaches. Monolayers of [Ru(tpyada)(tpySH)](PF6)2 on ITO surfaces are studied by electrochemical techniques. Detailed NMR analysis of tpySH reveals the presence of two tautomers, an “NH” and an “SH” form. The X-ray crystal structure of the oxidised form of the ligand tpySStpy is reported. A new ligand tpySCH2Stpy is prepared and its dinuclear Ru(II) complexes are reported, (4) [(ttp)Ru(tpyS CH2Stpy)Ru(ttp)]+2, (5) [(biptpy)Ru(tpySCH2Stpy)Ru(bitpy)]+2, (6) [(pm-β-CD(ttp))Ru(tpySCH2 Stpy)Ru(pm-β-CD(ttp))]+2. The complexes show characteristic red 3MLCT luminescence which is much stronger than their analogous mononuclear counterparts.
|Number of pages||13|
|Early online date||2 Apr 2007|
|Publication status||Published - 2007|
- luminescence, cyclodextrin, surface active metal complexes, electrochemistry