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Design of the structure of nanosized photo-catalysts is an interesting research area to achieve high performance of their catalytic property. Nano-scaled single crystals of {[Ni(EN)4(NCS)2]} coordination complex (EN = ethyl nicotinate), CC1 and the nano-sized particles, CC1\ are synthesized by self-assembly and ultrasonic radiation methods, respectively. The structure comprises two crystallographically different and chemically identical Ni atoms adopting [NiN6] octahedron geometry. The structure of CC1 propagates via 1D-zegzag chains which extend in 3D- fashion via strong H-bonds. The chemical structure and morphology of CC1 and CC1\ are characterized by single crystal and powder X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and spectroscopic methods. The heterogeneous catalytic and photo-catalytic activity of CC1 and CC1\ exhibit very efficient catalytic activity towards degradation of indigo carmine dye (IC) within very short times under UV-light or ultrasonic radiation. The good limit of detection and the high quenching efficiency of CC1 towards selective quantitative fdetermination of nitrobenzene (NB) and Fe3+ ions support its behavior as an efficient luminescent sensor.

Yellow prismatic nanoparticles of the supramolecular coordination polymer (SCP) [Cu6(CN)7(C6H12N4)2(OH3)], 1 were obtained by the reaction of K3[Cu(CN)4] and hexamethylenetetramine (hmt) in presence of Me3SnCl at ambient conditions. The X-ray structure of 1 consists of many rhombic [(Cu)2µ3–(CN)2] motifs which construct eight fused cyclic rings accommodating two hmt ligands. The copper atoms exhibit pseudo-tetrahedral configuration. The cyanide ligands create the bifurcated µ3-CN bridges. The [(Cu)2µ3–(CN)2] motifs causes expansion of the structure of 1 to three dimensions while extensive H-bonds play an essential role in packing structure. SCP 1 was used as an efficient heterogeneous catalyst for oxidative mineralization of acid blue-92 (AB-92), textile dye, with H2O2. The study aimed to investigate the efficiency of recycled the catalyst 1 and the mechanism of degradation of AB-92. The morphological feature of the SCP 1 as a catalyst before and after catalysis was examined by high resolution transmission electron microscope (TEM).