Ruthenium stilbenyl and Diruthenium Distyrylethene Complexes : Aspects of Electron Delocalization and Electrocatalyzed Isomerization of the Z-Isomer

Linseis, Michael; Zalis, Stanislav; Zabel, Manfred; Winter, Rainer F.

Ruthenium stilbenyl and Diruthenium Distyrylethene Complexes : Aspects of Electron Delocalization and Electrocatalyzed Isomerization of the Z-Isomer

Dateien

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Datum

2012

Autor:innen

Linseis, Michael

Zalis, Stanislav

Zabel, Manfred

Winter, Rainer F.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of the American Chemical Society. 2012, 134(40), pp. 16671-16692. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja3059606

Zusammenfassung

Regio- and stereoselective insertion of the terminal ethynyl functions of 4-ethynylstilbene, the E and Z isomers of 4,4′-bis(ethynylphenyl)ethene and a backbone-rigidified cyclohexenyl derivative of the Z isomer into the Ru–H bond of the complex RuClH(CO)(PiPr3)2 provides the corresponding vinyl ruthenium complexes, which have been characterized spectroscopically and by X-ray crystallography. Large red shifts of the UV/vis absorption bands evidence efficient incorporation of the vinyl metal subunit(s) into the conjugated π-system. All complexes oxidize at low potentials. The various oxidized forms of all complexes were generated and characterized by UV/vis/NIR, IR and EPR spectroscopies. These studies indicated electrocatalytic Z→E isomerization of the oxidized Z-distyrylethene complex Ru-Z2, which is prevented in its backbone-rigidified derivative Ru-Z2fix. The radical cations of the E and the configurationally stable cyclohexene-bridged Z-derivatives are spin-delocalized on the EPR time scale but charge-localized on the faster IR time scale. The degree of ground-state charge delocalization in the mixed-valent state has been quantified by the incremental shifts of the Ru–CO bands upon stepwise oxidation to the radical cations and the dications and was found to be remarkably large (19% and 9%) considering redox splittings ΔE1/2 of just 49 or 74 mV. Quantum chemical studies with various levels of sophistication reproduce our experimental results including the electronic spectra of the neutral complexes and the intrinsically localized nature of the radical cations of the dinuclear complexes.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

LINSEIS, Michael, Stanislav ZALIS, Manfred ZABEL, Rainer F. WINTER, 2012. Ruthenium stilbenyl and Diruthenium Distyrylethene Complexes : Aspects of Electron Delocalization and Electrocatalyzed Isomerization of the Z-Isomer. In: Journal of the American Chemical Society. 2012, 134(40), pp. 16671-16692. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja3059606

BibTex

@article{Linseis2012-10-10Ruthe-20695,
  year={2012},
  doi={10.1021/ja3059606},
  title={Ruthenium stilbenyl and Diruthenium Distyrylethene Complexes : Aspects of Electron Delocalization and Electrocatalyzed Isomerization of the Z-Isomer},
  number={40},
  volume={134},
  issn={0002-7863},
  journal={Journal of the American Chemical Society},
  pages={16671--16692},
  author={Linseis, Michael and Zalis, Stanislav and Zabel, Manfred and Winter, Rainer F.}
}

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