The electrochemical water splitting by transition metal complexes is emerging very rapidly. The nickel complexes also play a very vital role in various biological activities. Here, three new ligands {H2mbhce=...

A mathematical model has been constructed for peristaltic transport of micro-polar fluid in a circular cylindrical tube of finite length by letting sinusoidal waves propagate along the wall that induce contraction and relaxation but not expansion beyond the natural boundary. Axial and radial velocities and micro-rotation components are formulated for micro-polar fluid transportations by applying the method of long wavelength and low Reynolds number approximations in the analysis. Pressure distribution along the tube length is studied to investigate temporal effects. An in-depth study has been done to learn the effects of coupling number and micro-polar parameter. The effects of coupling number and micro-polar parameter are investigated also on mechanical efficiency, reflux and trapping. A significant difference observed is that unlike integral wave-trains propagating along the tube walls that have identical peaks of pressure, non-integral wave-trains have peaks of different sizes.

Electrocatalytic water oxidation by transition metal complexes is an emerging area of research. Here, two cobalt(III) complexes [Co(ftsm)NH 3 (o-phen)]ÁH 2 O(1) {ftsm = bis(5-furan-1,2,4-triazole)-3-sulfinamide} and [Co(ptsm)NH 3 (o-phen)]ÁCH 3 OH (2) {ptsm = bis(5-phenyl-1,2,4-triazole)-3-sulfinamide} were synthesized and characterized by various spectroscopic and X-ray crystallography techniques. Complexes 1 and 2 were found to have admirable electrocatalytic activity towards oxygen evolution reaction (OER). The Tafel slope values for GC/Nf-Complex-2 and GC/RuO 2 were 53 and 60 mV/dec, respectively. Consequently, complex 2 possesses a better water oxidation response than standard material RuO 2 . The ligands Haftt, Haptt, o-phen, and complexes 1 and 2 were also tested for their cytotoxicity against Dalton's lymphoma (DL) cells employing MTT assay and found to have significant cytotoxicity. The IC 50 values of Haftt, Haptt, mixed ligands Haftt + o-phen and Haptt + o-phen, and complexes 1 and 2 against DL cells were found to be 150, 400, 200, 450, 80, and 5 μM, respectively. The complexes were found to have minimal effect on normal cells. The remarkable IC 50 value for complex 2 shows that it can be utilized as a potential anticancer agent against DL cells.

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