{trans-1,4-Bis[(4-pyridyl)ethenyl]benzene}(2,2‘-bipyridine)ruthenium(II) Complexes and Their Supramolecular Assemblies with β-Cyclodextrin

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Abstract

Two novel ruthenium polypyridine complexes, [Ru(bpy)₂Cl(BPEB)](PF₆) and {[Ru(bpy)₂Cl]₂(BPEB)}(PF₆)₂ (BPEB = trans-1,4-bis[2-(4-pyridyl)ethenyl]benzene), were synthesized and their characterization carried out by means of elemental analysis, UV−visible spectroscopy, positive ion electrospray (ESI-MS), and tandem mass (ESI-MS/MS) spectrometry, as well as by NMR spectroscopy and cyclic voltammetry. Cyclic and differential pulse voltammetry for the mononuclear complex showed three set of waves around 1.2 V (Ru^2+/3+), −1.0 V (BPEB^0/-), and −1.15 (BPEB^-/2-). This complex exhibited aggregation phenomena in aqueous solution, involving π−π stacking of the planar, hydrophobic BPEB ligands. According to NMR measurements and variable-temperature experiments, the addition of β-cyclodextrin (βCD) to [Ru(bpy)₂Cl(BPEB)]⁺ leads to an inclusion complex, breaking down the aggregated array.

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