Synthesis, Characterization, and Ethylene Oligomerization and Polymerization by 2-Quinoxalinyl-6-iminopyridine Chromium Chlorides

Saliu A. Amolegbe; Maliha Asma; Min Zhang; Gang Li; Wen-Hua Sun

doi:10.1071/CH08016

RESEARCH ARTICLE

Previous Contents Vol 61(5)

Synthesis, Characterization, and Ethylene Oligomerization and Polymerization by 2-Quinoxalinyl-6-iminopyridine Chromium Chlorides

Saliu A. Amolegbe ^A , Maliha Asma ^A , Min Zhang ^A , Gang Li ^A and Wen-Hua Sun ^A ^B

+ Author Affiliations

- Author Affiliations

^A Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.

^B Corresponding author. Email: whsun@iccas.ac.cn

Australian Journal of Chemistry 61(5) 397-403 https://doi.org/10.1071/CH08016
Submitted: 16 January 2008 Accepted: 20 April 2008 Published: 22 May 2008

Abstract

A series of chromium(iii) complexes ligated by N^N^N tridentate 2-quinoxalinyl-6-iminopyridine were synthesized and characterized by elemental analysis and infrared spectroscopy. Single-crystal X-ray diffraction analysis for the structure of complex C3 reveals a distorted octahedral geometry. When methylaluminoxane was employed as the co-catalyst, the chromium complexes showed high activities for ethylene oligomerization and polymerization. The distribution of oligomers obtained followed Schulz–Flory rules with high selectivity for α-olefins. Both steric and electronic effects of coordinated ligands affected the catalytic activities as well as the properties of the catalytic products. The parameters of the reaction conditions were also investigated to explore the optimum catalytic potentials of these complexes.

Acknowledgements

S.A.A. and M.A. are grateful to the Chinese Academy of Science (CAS) and the Academy of Science for the Developing World (TWAS) for their Postgraduate Fellowships.

References

Synthesis, Characterization, and Ethylene Oligomerization and Polymerization by 2-Quinoxalinyl-6-iminopyridine Chromium Chlorides

Abstract

Acknowledgements

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