Multi-wall carbon nanotubes (MWNTs) modified by cobalt(II) Schiff base complex

摘要

During the last decade, studies on the isolation, characterization and catalytic activity of transition metal complexes covalently grafted on various carbon nanotubes (CNTs) received considerable attention because of their specific catalytic applications when compared to homogeneous complexes [1,2]. The complex loaded on CNTs is more suitable as support for the Schiff-base complex than other support like as, high-surface-area activated carbon because the latter exhibits some adventitious activity. Nevertheless, any work in [Co(II)(OH)2-salophen] Schiff-base covalently grafted on MWNTs didn''t report. In this paper, Co(II)[(OH)2-salophen] (N,N′-bis(4-hydroxysalicylidene)phenylene-1,2-diamine) complex was covalently grafted on the chemical modification of multi-wall carbon nanotubes (MWNTs); [Co((OH)2-salophen)]@MWNTs] (Fig. 1). The cobalt(II) Schiff-base complex covalently anchored on modified MWNTs was characterized by different techniques. The catalytic activity of the novel nanotube based materials was tested in the epoxidation of cyclohexene in the isobutyraldehyde/air system using acetonitrile as solvent and very high conversion was obtained.