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Type: Artigo de periódico
Title: {trans-1,4=bis[(4-pyridyl)ethenyl]benzene}(2,2′-bipyridine) Rutherium(ii) Complexes And Their Supramolecular Assemblies With β-cyclodextrin
Author: Toma S.H.
Uemi M.
Nikolaou S.
Tomazela D.M.
Eberlin M.N.
Toma H.E.
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 (Ru2+/3+), -1.0 V (BPEB0/-), 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 aggregatec array.
Rights: fechado
Identifier DOI: 10.1021/ic0352250
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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