Inorganic Chemistry Research
Volume:3 Issue: 2, Dec 2019

A new binuclear paddle-wheel palladium(II) complex of [Pd2(μ-mtzt)4]dmgH2 (1) has been prepared by the treatment of PdCl2 in acetonitrile with mixture of 1-methyl-1H-1,2,3,4-tetrazole-5-thiol (Hmtzt) and dimethylglyoxime (dmgH2) in methanol. Resulted complex was characterized by elemental analysis (CHNS), IR, UV–Vis absorption, 1H NMR spectroscopy and its structure was determined with single-crystal X-ray diffraction. Single crystal analysis reveals that this complex has binuclear structure in a paddle-wheel fashion with Pd-Pd distances of 2.808(2)Å. Also, in this binuclear complex, each palladium(II) ion has a slightly distorted square-pyramidal coordination geometry with the two nitrogen and two sulfur atoms in equatorial positions from four bridges mtzt- ligands and the second palladium subunit in axial position. Catalytic potentiality of complex 1 is also exhibited in the Mizoroki–Heck coupling reactions between a range of aryl halides and olefins. The catalyst shows very much efficient reactivity in the Mizoroki–Heck reactions giving high yield of the coupling products.

In the present contribution, a facile and efficient protocol for synthesis a nanohybrid structure of core-coronal-shell ZnO@ZIF-8 using ascorbic acid (ZnO@AA/ZIF-8) as a new adsorbent for arsenic removal from water has been represented. For this purpose, the ZnO nanospheres were synthesized by a green and simple method followed by coating with ascorbic acid (AA) to modify their surface to achieve better growth of ZIF-8 on the surface of ZnO. After that, the core-coronal-shell ZnO@ZIF-8 nanohybrid obtained via in situ ZIF-8 formation using the dispersion of ZnO (as a core) in an ethanol solution only including 2-methylimidazole under moderate conditions. Here, ZnO is utilized as a template (core) as well as the metal node for ZIF-8 synthesis. The as-synthesized ZnO and ZnO@AA/ZIF-8 structures were characterized by different techniques such as XRD, FT-IR, TGA, and, SEM-EDS. The analyses data confirmed the benefit of the method for the preparation of this new nanohybrid. The nanostructured ZnO@AA/ZIF-8 exhibited high efficiency in the removal of arsenic from water. The obtained results confirmed that core-coronal-shell metal oxide@MOF nanohybrid could be introduced as efficient candidates for heavy metals removal for practical applications.

We report the preparation and characterization of spinel-structured FeCo2O4 nanoparticles for the efficient and selective oxidation of sulfides. The as-prepared FeCo2O4 nanoparticles were characterized by powder X-ray diffraction (PXRD), energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). According to TEM images, the size of the FeCo2O4 particles is identified to be 10– 20 nm. The obtained FeCo2O4 nanoparticles were used as an efficient catalyst for oxidation of sulfides. For all sulfide substrates, very good conversions (69-100%) and selectivities (89-99%) depending on the nature of the sulfide substrates were obtained. The reusability and recoverability of catalyst show that the catalytic system can be reused fourth times without significant loss of reactivity and stability.

In this research, the interaction of [CuL(DMF)], [NiL(DMF)] and [VOL(DMF)] (where L = ((E)-4-((2-amino-5-nitrophenylimino)methyl)benzene-1,3-diol)) complexes derived from tridentate Schiff base ligand with bovine serum albumin (BSA) and DNA was investigated via electronic absorption and fluorescence spectroscopy. The Ultraviolet-Visible (UV-Vis) spectra exhibited an isosbestic point for the complexes through titration with DNA. The experimental results showed the presence of intercalation interaction between the complexes and calf-thymus DNA (CT-DNA). The interaction of BSA protein and complexes was significant. The recorded florescence spectra of complexes interacting with DNA and BSA revealed the static quenching manner. The free binding energies of complexes and their interaction modes with DNA and BSA were determined by the molecular docking. MTT-dye reduction technique was applied to define cytotoxicity of [NiL(DMF)], [CuL(DMF)] and [VOL(DMF)] complexes against breast cancer 4T1 and colon carcinoma C26 cell lines. The [VOL(DMF)] complex had cytotoxic activity against 4T1 and C26 cell lines.

In this research we report synthesis of new Barium- Cobalt precursor complex with 2,6- pyridine dicarboxylic acid (dipic).Thecomplex[Ba(H2O)6][Co(dipic)2[(1)has been characterized using spectral methods (FT-IR, UV–Vis),elemental analysis and Cyclic voltammetric (CV) method. Also in this study we report thermal decomposition of inorganic precursor complex of (1).Characterization of the binary oxide nanoparticlewas carried out usingFourier Transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), Scanning electron microscopy (SEM),Vibrating sample maghetometer (VSM)and energy dispersive X-ray analysis (EDX). The X-ray diffraction pattern at room temperature revealed that, highly pure and crystallized BaCoO2.70in orthorhombicstructure with a=4.2300 Å, b=4.3500 Å and c=11.3200 Å.

Reaction of [PtMe(C^N)(SMe2)] (C^N = 2-phenylpyridinate (ppy); 1a, C^N = benzo[h]quinolate, (bhq); 1b) with hydrogen peroxide gives the platinum(IV) complexes trans-[PtMe(OH)2(C^N)(H2O)] (C^N = ppy; 3a, C^N = bhq, 3b) bearing platinum-oxygen bonds. The Pt(II) complexes 1a and 1b have 5dπ(Pt)→π*(C^N) MLCT band in the visible region which is used to easily follow the kinetic of its reaction with H2O2. The kinetics and mechanism of Pt−O bond formation have been experimentally and theoretically investigated, showing the simple second-order kinetics; rate = k2[H2O2][Pt(II) complex]. The Pt(IV) products were characterized by NMR spectroscopy and elemental analysis. The geometries and the nature of the frontier molecular orbitals of Pt(IV) complexes containing Pt-O bonds were also studied by means of the density functional theory. Complex 3b is unstable during the crystallization process in CH2Cl2/acetone and gives the binuclear complex [Pt2Me2(Cl)2(μ-OH)2(bhq)2], 4.

Exceptional 3D magnetite nanoparticles (Fe3O4) with high surface area, flower-like morphology, and suitable interaction with the natural polymeric matrices have been selected as inorganic nano-filler in preparation of magnetite/κ-carrageenan nanocomposites (MCNCs). Chemical and structural properties of MCNCs were studied and characterized by ATR-FTIR, X-ray powder diffraction (XRPD), scanning and transmission electron microscopies (SEM and TEM), and thermogravimetric analyses (TGA). The MCNCs are considered as a magnetic adsorbent for adsorptive removal of contaminations such as Cu(II) from aqueous solutions. Based on adsorption data, MCNC 10 wt.% was selected for adsorption studies and different parameters including pH, contact time, and initial concentration of Cu(II) ions were optimized. The batch sorption mechanism and kinetics were estimated using three reaction kinetic models including pseudo-second-order, Elovich, and intra-particle diffusion. Besides, the adsorbent performance was evaluated by two common isotherm models: Langmuir and Freundlich. More significantly, kinetics and isotherm equilibrium data showed a major fitting with the intra-particle diffusion and Langmuir model, respectively. The maximum value of adsorption capacity to Cu(II) ions was found to be 22.57 mg g−1 (pH = 6, adsorbent dose 0.005g (1 g L-1), 25 °C, 180 rpm, and 80 min). The relative standard deviations (RSDs) for sorbent-to-sorbent reproducibility was 7.5 % (n = 3). The MCNC 10 wt.% was separated easily by a supermagnet and recycled 4 times easily with the adsorption efficiency of 84 % in the final cycle.

The effects of changing ligand structures of cobalt complexes as electrolytes on the performance of the dye-sensitized solar cell were investigated. In this paper, cobalt(II/III) tris(2,2′-bipyridine), cobalt(II/III) tris(4,4′-dimethyl-2,2′-bipyridine) and cobalt(II/III) tris(4,4´-dimethoxy-2,2′-bipyridine) complexes as electrolytes in conjugate with organic dye D149 were investigated to consider the correlation of the cobalt complexes structural on the efficiency of the dye-sensitized solar cell. The Voc values of the prepared cells are related to the redox potential of their complexes and the maximum Voc was observed with cobalt(II/III) tris(2,2′-bipyridine) electrolyte. The obtained results represented that the cobalt(II/III) tris(4,4´-dimethyl- 2,2′-bipyridine) electrolyte has the highest efficiency in the solar cell compared with other cobalt complexes. These observed results have been interpreted by a possible interaction between the dye and cobalt complexes, which is more pronounced in the cobalt(II/III) tris(4,4´-dimethoxy- 2,2′-bipyridine) cell. This interaction should be fine-tuning with the structure of dye and complex to increase the efficiency of the dye-sensitized solar cell. In addition, the results demonstrated that a thinner layer of the TiO2 film decrease both the effects of mass transport issues and the charge recombination, therefore, it has significant advantages for cobalt electrolyte.