Monatshefte für Chemie - Chemical Monthly

, Volume 146, Issue 7, pp 1153–1160 | Cite as

Initiation efficacy of halo-chelated cis-dichloro-configured ruthenium-based second-generation benzylidene complexes in ring-opening metathesis polymerization

  • Julia Wappel
  • Krzysztof Grudzień
  • Michał Barbasiewicz
  • Michał Michalak
  • Karol Grela
  • Christian Slugovc
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Abstract

The initiation efficacy of eight differently substituted halo-chelated cis-dichloro-configured ruthenium-based second-generation benzylidene complexes was assessed in the ring-opening metathesis polymerization of a norbornene derivative in two solvents and at three temperatures. From the evaluation of the number average molecular masses and the molecular mass distributions of the resulting polymers a conclusion on the level of initiation was possible and it was found that the metathesis-inactive cis-dichloro-configured pre-initiators quickly isomerize to their metathesis-active trans-dichloro isomers leading to remarkably high initiation efficiencies in toluene at 80 °C. Even controlled polymerization is feasible under these conditions. Further, the diverse initiation efficacies of the eight pre-initiators at ambient temperature are discussed with the emphasis to identify whether the position of the cis–trans equilibrium or the speed of the isomerization is responsible for the results obtained in the polymerization experiments.

Graphical abstract

Keywords

Olefin metathesis Ruthenium Structure–activity relationships Polymerizations 
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Notes

Acknowledgments

We gratefully acknowledge the EC (CP-FP 211468-2 EUMET) for financial support and Umicore for the gift of Ru complexes. KG and KG acknowledge the National Science Centre (Poland) for the NCN MAESTRO Grant No. DEC-2012/04A/ST5/00594. Further we thank the Austrian Agency for International Cooperation in Education and Research (project number: PL10/2014) for promoting academic mobility.

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Julia Wappel
    • 1
  • Krzysztof Grudzień
    • 3
  • Michał Barbasiewicz
    • 2
  • Michał Michalak
    • 2
  • Karol Grela
    • 3
  • Christian Slugovc
    • 1
  1. 1.Institute for Chemistry and Technology of MaterialsGraz University of TechnologyGrazAustria
  2. 2.Faculty of ChemistryUniversity of WarsawWarsawPoland
  3. 3.Faculty of Chemistry, Biological and Chemical Research CentreUniversity of WarsawWarsawPoland

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