Browsing by Author "Sabiah, Shahulhameed"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Publication Biphenyl appended non-noble metal complexes as electrocatalysts for the electrochemical oxygen reduction reaction(Elsevier B.V., 2022) Junaid, Qazi Mohammad; Singh, Devesh Kumar; Ganesan, Vellaichamy; Sabiah, ShahulhameedThe oxygen reduction reaction (ORR) is one of the most important reactions in many electrochemical processes. There has been a growing interest in the replacement of noble metal electrocatalysts for oxygen reduction reaction (ORR). In continuation of these efforts herein we report the design and synthesis of biphenyl appended non-noble transition metal and Zn(II) complexes as electrocatalysts in the aforementioned reaction. In this regard nitrogen-based bidentate ligand, 6-(quinolin-8-yl)-6,7-dihydro-5H-dibenzo[c,e]azepine as Ligand, L was synthesized and used for the preparation of a series of mononuclear Ni(II) and Zn(II) complexes, [ML(X)2] which differ only by the halide ion attached to the respective metal center. All complexes of this series showed tetrahedral geometry regardless of the halide ion and metal center (Ni/Zn). The complexes were characterized by different spectroscopic techniques. The triflate (OTf) complexes of Fe(II) and Cu(II) were also synthesized to evaluate their ORR activity. All the complexes were investigated for their electrocatalytic activity in oxygen reduction reaction (ORR) in which complex 1, [NiL(Cl)2] showed the highest activity with an onset potential of 0.75 V. The remaining complexes also showed significant ORR performance with onset potentials close to that of complex 1. � 2022Publication C2-Symmetric Bissulfoximine-Based Metal Complexes: Synthesis, Characterization and Their Electrocatalytic Activity in Oxygen Reduction Reaction(John Wiley and Sons Ltd, 2022) Junaid, Qazi Mohammad; Kumar Singh, Devesh; Ganesan, Vellaichamy; Sabiah, ShahulhameedSulfoximine-based metal complexes have gained much interest in recent years owing to their promising properties in synthetic organic chemistry. These sulfoximines have been recently introduced in the field of organometallics. However, the coordination properties of pincer sulfoximine ligands and their metal complexes have not been reported. Here, a C2-symmetric bissulfoximine-based pincer ligand ((pyridine-2,6-diylbis(methylene))bis(azaneylylidene))bis(diphenyl-?6-sulfanone), namely S-P ligand and its metal [M(SP)2]2+ {M=Fe (SC-1), Co (SC-2), Ni (SC-3), Cu (SC-4)} complexes, were synthesized. The complexes were characterized by different spectroscopic techniques like UV-Vis, IR, NMR, ESI-MS, and single-crystal XRD. Complexes SC-1 and SC-3 exhibited octahedral geometry irrespective of the metal center. The complexes were systematically explored for electrocatalytic oxygen reduction reaction (ORR) by immobilizing them on a glassy carbon electrode using Nafion. These complexes showed selective two-electron catalytic reduction of O2 to H2O2 in which complex SC-2 showed the highest selectivity (?90%) and complex SC-4 showed the highest onset potential (0.75 V). � 2022 Wiley-VCH GmbH.Publication Multicomponent Synthesis of S-Benzyl Dithiocarbamates from para-Quinone Methides and Their Biological Evaluation for the Treatment of Alzheimer�s Disease(American Chemical Society, 2022) Venkatesh, Rapelly; Shankar, Gauri; Narayanan, Aswathi C.; Modi, Gyan; Sabiah, Shahulhameed; Kandasamy, JeyakumarMulticomponent synthesis of biologically relevant S-benzyl dithiocarbamates from para-quinone methides, amines, and carbon disulfide are described under catalyst and additive-free conditions. The reactions proceeded at room temperature in a short span of time with excellent yields. One of the synthesized compounds, 3e showed considerable acetylcholinesterase (AChE) inhibitory (51.70 + 5.63% at 20 ?m) and antioxidant (63.52 � 1.15 at 20 ?m) activities. � 2022 American Chemical Society.
