The influence of different coordination environments on one-dimensional Cu(ii) coordination polymers for the photo-degradation of organic dyes

Abstract

Three new Cu(ii) coordination polymers, namely, {[Cu3(L(1))(NO3)2(DMF)(H2O)]·3(DMF)}n (), [Cu3(L(1))(Cl)2(DMF)2]n () and [Cu3(L(2))(NO3)4(H2O)4]n (), were synthesized from pyridine-2,6-dicarbohydrazide based imine linked tritopic ligands. All the complexes were characterized using elemental analysis, IR, UV-vis spectroscopy and ESI-MS. The solid state structures of complexes were determined using single crystal X-ray crystallography. The complexes contain trinuclear copper units connected through different anions that lead to the formation of one dimensional (ID) chain structures. Depending upon the anion of the copper salt and donor atoms of the ligands used in complexation, a small variation in the structures was observed. In complex , the trinuclear copper units are connected by phenoxo-bridging (μ2-O(-)) along with one coordinated water molecule, whereas complex is connected through chloride bridging (μ2-Cl) and complex is connected through nitrate ions (μ-[O-N-O]) along with four water molecules. Photo-catalytic activities of the synthesized complexes () were investigated. All the complexes were found to be photo-catalytically active; however, the distinct coordination environment of the metal ions (i.e. difference in the coordinated water molecules and donor sites of ligands) played a significant role in the catalytic activities. Therefore, this study presents comparative photo-catalytic studies of different coordination environments of metal ions in one-dimensional Cu(ii) coordination polymers. The results provide a potential pathway for the rational design of more efficient photo-catalysts.

Polymorphism in [Ag(bpetan)]n Coordination Polymers with Nitrate and Isophthalate Anions: Photocatalytic and Antibacterial Activity, Hemolysis Assay and Study of Cytotoxicity

“…The •OH generated on light irradiation might oxidize MB, ultimately resulting in the degradation of dye. In order to determine the active species generated during the photocatalytic process, experiments were carried out using isopropyl alcohol (IPA), ammonium oxalate (AO), benzoquinone (BQ), that act as scavenger towards •OH, H + and •O 2 − species, respectively . The degradation efficiency of MB by CP2 was greatly inhibited by the presence of IPA, while the effect of AO and BQ is lower.…”

“…In order to determine the active species generated during the photocatalytic process, experiments were carried out using isopropyl alcohol (IPA), ammonium oxalate (AO), benzoquinone (BQ), that act as scavenger towards * OH, H + and * O 2 À species, respectively. [41][42][43][44] The degradation efficiency of MB by CP2 was greatly inhibited by the presence of IPA, while the effect of AO and BQ is lower. Therefore, it may be concluded that the * OH is the species mainly responsible for photocatalytic degradation of dye ( Figure 12).…”

Comparative structure activity relationship for heterogeneous phosphatase-like catalytic activities of one-dimensional Cu(ii) coordination polymers

“…Unless otherwise specied, chemicals were purchased from commercial suppliers and used without further purication. 16 The NMR spectra of the ligands were performed in DMSO-d 6 with TMS as an internal reference, on JNM-ECS400 (JEOL) instrument operating at 400 MHz for 1 H NMR. were purchased from Aldrich.…”

“…Recently we have reported nickel(II) complexes of some Schiff bases and found them to exhibit reasonable phosphatase like and photocatalytic activities. 16 The nally synthesized products were identied by their reported physicochemical properties. The hetero-catalytic activities of these complexes, towards phosphate ester bond cleavage were studied and structure activity relationship of these complexes with appropriate mechanisms is nally reported.…”

Enhanced photocatalytic performance of WON@porous TiO2 nanofibers towards sunlight-assisted degradation of organic contaminants

“…Recently, degradation of organic pollutants assisted only by solar energy as a clean renewable source has received considerable interest. In this respect, different types of photocatalysts have been devoted for this aim including plasmonic metals-based materials, [1][2][3][4] metal-organic frameworks (MOFs), 5-10 organic polymers based compounds, 11,12 graphene and carbon nitride-based materials, [13][14][15] metal complexes, 16,17 hybrid compounds, and composites. [18][19][20] Among them, metal oxides such as TiO 2 , WO 3 , CeO 2 , Cu 2 O and ZnO have been extensively used as photocatalysts for such application type.…”