Abstract
Colorless crystals of the coordination polymer (CP) [Cd(EIN)(2)(SCN)(2)], 1, and pink crystals of the coordination complex [Co(EIN)(4)(SCN)(2)], 2 were prepared by the reaction of metal nitrate salt with ethyl isonicotinate (EIN) and thiocyanate anion as bridged ligand. The structures of 1 and 2 were characterized by elemental analyses, electronic, FT-IR, H-1-NMR spectroscopy, thermal analysis and X-ray diffraction measurements. The structure of the CP 1 consists of cyclic (CdSCN)(n) building blocks which exhibit chair conformation creating 1D-chain decorated by the coordinated EIN on both sides. The network structure of 2 contains discrete units of [Co(SCN)(2)(EIN)(4)] connected by extensive H-bonds to form 1D-chain. The free ethyl carboxylate groups play the essential role in the formation of the H-bonds extending the structures of 1 and 2 to 3D-network. The catalytic behavior of 1 and 2 was utilized for degradation of acid blue 92 dye (AB-92). The kinetic data indicated that 1 and 2 are effective catalysts for degradation of AB-92 while irradiation enhances significantly the rate of degradation. Disodium salt of terephthalic acid photoluminescence probing technology was carried out to identify the reactive oxygen species. Moreover, the efficiency of recycled the catalysts and the mechanism of degradation of AB-92 dye were also investigated.