▎ 摘　　要

A new graphene oxide-based hybrid material (HL) and its Co(II), Cu(II) and Ni(II) metal complexes were prepared. Firstly, graphene oxide and (3-aminopropyl)trimethoxysilane were reacted to give graphene oxide-3-(aminopropyl)trimethoxysilane (GO-APTMS) hybrid material. After that, hybrid material HL was synthesized from the reaction of GO-APTMS and 2,6-diformyl-4-methylphenol. Finally, Co(II), Cu(II) and Ni(II) complexes of HL were obtained. All the materials were characterized using various techniques. The chemosensor properties of HL were investigated against Na+, K+, Cd2+, Co2+, Cu2+, Hg2+, Ni2+, Zn2+, Al3+, Cr3+, Fe3+ and Mn3+ ions and it was found that HL has selective chemosensing to Fe3+ ion. All the graphene oxide-supported complexes were used as heterogeneous catalysts in the oxidation of 2-methylnaphthalene (2MN) to 2-methyl-1,4-naphthoquinone (vitamin K-3, menadione) in the presence of hydrogen peroxide, acetic acid and sulfuric acid. The Cu(II) complex showed good catalytic properties compared to the literature. The selectivity of 2MN to vitamin K-3 was 60.23% with 99.75% conversion using the Cu(II) complex.