Co(II), Fe(III) or VO(II) Schiff base metal complexes immobilized on graphene oxide for styrene epoxidation. (30th April 2015)

• Record Type: Journal Article
• Authors: Su, Hailiang; Wu, Shujie; Li, Zhifang; Huo, Qisheng; Guan, Jingqi; Kan, Qiubin
• Is Part Of: Applied organometallic chemistry. Volume 29:Number 7(2015:Jul.)
• Page Start: 462
• Page End: 467
• Publication Date: 2015-04-30
• Subjects: Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.3316
• Languages: English
• ISSNs: 0268-2605

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Cobalt(II), iron(III) or oxovanadium(II) Schiff base metal complexes have been covalently grafted onto graphene oxide (<bold>GO</bold>) previously functionalized with 3‐aminopropyltriethoxysilane. Potential catalytic behaviors were tested in the <named-content content-type="reactionType" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">epoxidation</named-content> of styrene, using air as the oxidant. The catalysts were characterized using infrared (IR) and Raman spectroscopies, thermogravimetric analyses, <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">inductively coupled plasma</named-content> atomic <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">emission spectrometry</named-content> (ICP‐AES), X‐ray diffraction, nitrogen adsorption–desorption, scanning <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">electron microscopy</named-content> (SEM) and transmission <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">electron microscopy</named-content> (TEM). IR spectroscopy, thermogravimetric analyses and ICP‐AES confirmed the successful incorporation of the metal Schiff base complexes onto <bold>GO</bold>. X‐ray diffraction, nitrogen adsorption–desorption, <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">Raman spectroscopy</named-content>, SEM and TEM showed the intact structure of the <bold>GO</bold>. <bold>Co-GO</bold> and <bold>Fe-GO</bold> showed high styrene conversion (90.8 versus 86.7%) and epoxide selectivity (63.7 versus 51.4%). Nevertheless, <bold>VO-GO</bold> showed poorer catalytic performance compared with <bold>Co-GO</bold> and <bold>Fe-GO</bold>. The recycling results of these heterogeneous catalysts showed good recoverability without significant loss of activity and selectivity within four successive runs. Copyright © 2015 John Wiley & Sons, Ltd.</p> </abstract>