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Issue 5, 2013
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Immobilized Cu(II) and Co(II) salen complexes on graphene oxide and their catalytic activity for aerobic epoxidation of styrene

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Abstract

Novel graphene oxide (GO) tethered Cu(II) and Co(II) salen complexes [M–Salen–GO (M = Cu, Co)] were synthesized via a stepwise procedure and examined as catalysts in the epoxidation of styrene. Acetonitrile was used as a solvent and air as the oxidant in combination with a sacrificial co-reductant isobutyraldehyde. A comparison with homogeneous salen complexes of Co and Cu and graphene oxide (GO) tethered salen complexes was made. Heterogeneous copper(II) and cobalt(II) catalysts were confirmed by X-ray diffraction (XRD), FT-IR, diffusion reflection UV-visible spectroscopy, inductively coupled plasma atomic emission spectroscopy (ICP-AES), TEM, TG, Raman and XPS. FT-IR, diffusion reflection UV-visible and inductively coupled plasma atomic emission spectroscopy (ICP-AES), along with TG, Raman and XPS results showed that Cu(II) and Co(II) salen complexes were successfully grafted on GO; X-ray diffraction (XRD) and TEM indicated that the sample structures were well preserved. It was found that heterogeneous catalysts were active and showed good recoverability without significant loss in activity and selectivity within successive runs.

Graphical abstract: Immobilized Cu(ii) and Co(ii) salen complexes on graphene oxide and their catalytic activity for aerobic epoxidation of styrene

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Publication details

The article was received on 24 Jan 2013, accepted on 04 Mar 2013 and first published on 05 Mar 2013


Article type: Paper
DOI: 10.1039/C3NJ00099K
Citation: New J. Chem., 2013,37, 1561-1568
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    Immobilized Cu(II) and Co(II) salen complexes on graphene oxide and their catalytic activity for aerobic epoxidation of styrene

    Z. Li, S. Wu, H. Ding, D. Zheng, J. Hu, X. Wang, Q. Huo, J. Guan and Q. Kan, New J. Chem., 2013, 37, 1561
    DOI: 10.1039/C3NJ00099K

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