▎ 摘　　要

It has been synthesized the graphene oxide-based hybrid ligands and their Cu(II), Co(II) and Ni(II) complexes. Firstly, GO was reacted with 3-(trimethoxysilyl)propylamine in ethanol and the obtained structure was treated with 2,6-diformyl-4-bromophenol and 2,6-diformyl-4-tert-butylphenol in order to obtain the hybrid ligands HL1 and HL2. The synthesized hybrid ligands and their metal complexes have been and characterized by using FTIR, UV-vis., XRD, EDX, SEM, TEM, cyclic voltammetry, TG/DTA and ICP-OES techniques. Catalytic activities of Cu(II), Co(II) and Ni(II) complexes of the synthesized ligands have been investigated in the oxidation of 2-methyl naphthalene (2MN) to 2-methyl-1,4-naphthoquinone (vitamin K-3). The chemosensing behaviours of the hybrid ligands were also researched by using UV-vis. technique upon addition of various metal ions such as Na(I), K(I), Cd(II), Co(II), Cu(II), Hg(II), Ni(II), Zn(II), Al(III), Cr(III), Fe(III), and Mn(II) in (1:5 V) ratio in MeOH. The UV-vis. spectra of free hybrid materials show one absorption band at 257 nm possibly due to pi-pi* transitions in hybrid ligands. While added the metal cations on the ligand dispersions as Cu(II) and Fe(III) (0.1 mM) (1:5 V) ratios in MeOH, a new absorption bands were appeared at different regions in 275-325, 300-375 nm, respectively, because of the complexation between the hybrid materials and the metal ions.