The efficient and selective light-driven conversion of carbon dioxide to formate is a scientific challenge for green chemistry and energy science, especially utilizing visible-light energy and earthabundant catalytic materials. In this report, two mononuclear Ni(II) complexes of pyridylbenzimidazole (pbi) and pyridylbenzothiazole (pbt), such as Ni(pbt)(pyS) 2 (1) and Ni(pbi)(pyS) 2 (2) (pyS = pyridine-2thiolate), were prepared and their reactivities studied. The two Ni complexes were examined for CO 2 conversion using eosin Y as a photosensitizer upon visible-light irradiation in a H 2 O/ethanol solvent. The photoreaction of CO 2 catalyzed by complexes 1 and 2 selectively affords formate with a high efficiency (14 000 turnover number) and a high catalytic selectivity of ∼99%. Undesirable proton reduction pathways were completely suppressed in the photocatalytic reactions with these sulfur-rich Ni catalysts under CO 2 . Hydrogen photoproduction was also studied under argon. Their kinetic isotope effects and influence of solution pH for formate and H 2 production in the photocatalytic reactions are described in relation to the reaction mechanisms. These bioinspired Ni(II) catalysts with N/S ligation in relation to [NiFe]-hydrogenases are the first examples of early transition metal complexes affording such high selectivity and efficiencies, providing a future path to design solarto-fuel processes for artificial photosynthesis.
Tridentate NNO donor Schiff base ligand and its mixed ligand zinc(II) complex were synthesized stoichiometrically and characterized by electronic, infrared, mass spectral techniques and elemental analysis. To understand the DNA binding ability, the complex was investigated by various analytical and spectroscopic techniques in presence of calf thymus DNA (CT‐DNA). The binding studies showed that the zinc complex interacts with DNA by groove binding mode with intrinsic binding strength of 2.11 × 105 M−1 and with bovine serum albumin the complex showed dynamic quenching attributed for changes in the secondary structure of BSA with efficient interaction. The MCF‐7 cell line studies of the zinc(II) complex with 90.8 μM IC50 value revealed that the complex is effective for the breast cancer cell line and has a potential as anticancer drug. Furthermore, the tridentate ligand and its mixed ligand zinc complex were screened for antibacterial and antifungal activities, which showed better antimicrobial activity for complex.
In this work, the synthesis of a Ru(II) complex derived from 4'-functionalized-2,2':6',2''-terpyridine ligand was described and the its spectral property of this complex was investigated. We synthesized this ligand and used that for the synthesis of Ru(II) complex. Ligand and complex were characterized by UV-vis, FT-IR, ESI-MS, CHN analysis and NMR methods. After synthesis and characterization of this complex, we investigated the application of this complex as a photosensitizer in manufacturing of dye-sensitized solar cells. A sandwich cell was prepared using the dye anchored TiO2 film as a working electrode and a second conducting glass coated with chemically deposited platinum as a counter electrode. The application of this complex in a dye-sensitized nanocrystalline TiO2 solar cell has demonstrated a short-circuit current density of 12.84 mA, with an open circuit potential of 0.69 V. The total efficiency of this dye-sensitized solar cell with this complex was 4.97%.Metal oxides have a wide-bandgap called semiconductor. In solar cells, the surface of these semiconductors is functionalized by attaching transition-metal complexes. These semiconductors are very important in solar energy conversion in dye-sensitized solar cells and molecular electronics. 1,2 Dye-sensitized solar cells (DSSCs) have lately received great consideration because of their easy manner of fabrication and productiveness in relation to the cost compared with silicon (Si) based photovoltaic cells. 3,4 Terpyridine ligands that used for the synthesis of metal complexes with different transition metal
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