Surface-Active Mononuclear and Dinuclear Ru(II) Complexes based on Thio-substituted Terpyridines Bearing Cyclodextrin Recognition Units

Zoe Pikramenou (1) , Patrick R Unwin (2)

1 School of Chemistry [Birmingham]
2 University of Warwick [Coventry]

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-?-CD(ttp))(tpySH)](PF6)2. The complexes bear a surface active thiol group and a recognition unit which is either a ?-cyclodextrin or a hydrophobic tail (admantyl- 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 electrochemistry 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-?-CD(ttp))Ru(tpySCH2 Stpy)Ru(pm-?-CD(ttp))]+2. The complexes show characteristic red 3MLCT luminescence which is much stronger than their analogous mononuclear counterparts.

Mots clés: Physical Sciences

Zoe Pikramenou, Patrick R Unwin. Surface-Active Mononuclear and Dinuclear Ru(II) Complexes based on Thio-substituted Terpyridines Bearing Cyclodextrin Recognition Units. Supramolecular Chemistry, 2007, 19 (01-02), pp.115-127. ⟨10.1080/10610270601026578⟩. ⟨hal-00513495⟩