Web Release Date: May 4,
{trans-1,4-Bis[(4-pyridyl)ethenyl]benzene}(2,2'-bipyridine)ruthenium(II)
Complexes and Their Supramolecular Assemblies with 
-Cyclodextrin
and
Instituto de Química, Universidade de São Paulo USP, Caixa Postal 26077, CEP 05513, São Paulo, SP, Brazil, and Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
Received October 24, 2003
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 
- stacking of the
planar, hydrophobic BPEB ligands. According to NMR measurements and variable-temperature experiments, the
addition of -cyclodextrin (CD) to [Ru(bpy)2Cl(BPEB)]+ leads to an inclusion complex, breaking down the aggregated
array.
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