Anti-bacterial, anti-oxidant activities of polymer-based metal complexes and their catalyst effects in presence of H2O2

Abstract

4-{[(3-Hydroxynaphthalen-2-yl)imino]methyl}benzene-1,2,3-triol Schiff-base, abbreviated as ligand (L), was synthesized and additionally, its polymer was obtained through oxidative polycondensation and named as poly-4-{[(3-hydroxynaphthalen-2-yl)imino]methyl}benzene-1,2,3-triolpoly-ligand (PL). The ammonium persulfate (NH4)2S(2)O(8) was used as an oxidant in this reaction. The metal complexes of PL were synthesized in the presence of various metal ions such as Cu2+, Hg2+, Ni2+, Pb2+,and Zn2+. The synthesized structures of PL and metal complexes were confirmed by FTIR, UV-vis, H-1 and C-13 NMR, and elemental analysis. Moreover, SEM and TGA analyses were performed for characterization. In this study, the anti-oxidant, anti-bacterial and catalytic properties of PL and its metal complexes were investigated. For anti-oxidant properties, 2,2-diphenyl-1-picryl-hydrazyl (DPPH) detection methods were studied. Also, for anti-bacterial activities they were tested against various bacteria using the minimum inhibitory concentration (MIC) method. It was observed that [Ni(PL)(2)] and [Pb(PL)(2)] metal complexes showed quite good anti-oxidant activities when they were compared with PL at its highest concentration of 100 ppm. The anti-bacterial activity results showed that [Hg(PL)(2)] had the highest MIC value of all the mentioned materials. The obtained catalytic activity results revealed that the synthesized poly-ligand metal [M(PL)(2)] complexes could be considered as an alternative catalyst to remove various organic pollutants from the aqueous environment. From this point of view, it is possible to say that [M(PL)(2)] complexes synthesized within the scope of the study could be used as polymeric agents to reduce environmental pollution.