(trans-1,4-bis[(4-pyridyl)ethenyl]benzene)(2,2'-bipyridine)ruthenium(II) complexes and their supramolecular assemblies with beta-cyclodextrin

Inorg Chem. 2004 May 31;43(11):3521-7. doi: 10.1021/ic0352250.

Abstract

Two novel ruthenium polypyridine complexes, [Ru(bpy)(2)Cl(BPEB)](PF(6)) and ([Ru(bpy)(2)Cl](2)(BPEB))(PF(6))(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 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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2,2'-Dipyridyl / analogs & derivatives*
  • 2,2'-Dipyridyl / chemical synthesis*
  • Cyclodextrins / chemical synthesis
  • Cyclodextrins / chemistry*
  • Deuterium Oxide
  • Electrochemistry
  • Hydrophobic and Hydrophilic Interactions
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Organometallic Compounds / chemical synthesis*
  • Ruthenium / chemistry*
  • Spectrometry, Mass, Electrospray Ionization
  • Stereoisomerism
  • Temperature
  • beta-Cyclodextrins*

Substances

  • Cyclodextrins
  • Ligands
  • Organometallic Compounds
  • beta-Cyclodextrins
  • dichlorobis(2,2'-bipyridine)ruthenium
  • 2,2'-Dipyridyl
  • Ruthenium
  • Deuterium Oxide
  • betadex