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Type: Artigo de periódico
Title: {trans,-1,4-bis[(4-pyridyl)ethenyl]benzene}(2,2 '-bipyridine)ruthenium(II) complexes and their supramolecular assemblies with beta-cyclodextrin
Author: Toma, SH
Uemi, M
Nikolaou, S
Tomazela, DM
Eberlin, MN
Toma, HE
Abstract: Two novel ruthenium polypyridine complexes, [Ru(bpy)(2)Cl(BPEB)](PF6) and {[Ru(bpy)(2)Cl](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 pi-pi stacking of the planar, hydrophobic BPEB ligands. According to NMR measurements and variable-temperature experiments, the addition of beta-cyclodextrin (betaCD) to [Ru(bpy)(2)Cl(BPEB)](+) leads to an inclusion complex, breaking down the aggregated array.
Country: EUA
Editor: Amer Chemical Soc
Citation: Inorganic Chemistry. Amer Chemical Soc, v. 43, n. 11, n. 3521, n. 3527, 2004.
Rights: fechado
Identifier DOI: 10.1021/ic0352250
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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