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A novel bifurcated ligand 3,5-di(1H-benzo[d]imidazol-1-yl)benzonitrile (DBIBN) has been synthesized, which reacts with Co(II) and Mn(II) salts to form new coordination polymers {[Co 2 (DBIBA) 3 ]•Cl•9H 2 O} n (1) and {[Mn 3 (DBIBA) 6 ]} n (2), (DBIBA = 3,5-di(1H-benzo[d]imidazol-1-yl)benzoate), in which DBIBN get hydrolyzed into DBIBA under solvothermal conditions. Both the complexes have been characterized by single-crystal X-ray crystallography (XRD), IR spectroscopy, elemental analysis, thermogravimetry, and X-ray powder diffraction (PXRD). Complex 1 is a 3D coordination polymer composed of binuclear Co(II) units, having (4,6) connected net. On the other hand, complex 2 is a layered structure with trinuclear Mn(II) units, which has 4-connected 4 4 sql topology. TGA and PXRD measurements show that the framework 1 is stable after desolvation. Desolvated framework 1 showed selective adsorption of CO 2 over N 2 , H 2, and Ar. Variable temperature magnetic susceptibility measurements show that complex 1 exhibits weak antiferromagnetic behavior.

Bio-/environment-friendly cationic gemini surfactant, ethane-1,2-diyl bis(N,N-dimethyl-N-hexadecylammoniumacetoxy)dichloride, referred to as 16-E2-16, was synthesized and characterized. Corrosion inhibition effects of 16-E2-16 on mild steel (MS) surface in 1 M HCl solution at 30, 40, 50 and 60°C were evaluated using gravimetric analysis, potentiodynamic polarisation and electrochemical impedance spectroscopy measurements. The nature of the protective inhibitor film formed on the MS surface was analysed by SEM, EDAX and FT-IR, while TGA was used to assure the thermal behaviour and stability of the film at high temperature. The formation of [inhibitor-Fe 2? ] on the surface of MS was confirmed by UV-visible spectroscopy. The inhibition efficiency of the studied inhibitor increased with increasing concentration and solution temperature. The compound behaved as a mixed type inhibitor and acted by blocking the electrode surface by means of adsorption obeying the Langmuir adsorption isotherm. Surface active properties and corrosion inhibition effects of 16-E2-16 in the presence of inorganic (NaI) and organic (NaSal) salts were also investigated and are discussed. Density functional theory calculations have been carried out to correlate the efficiency of the compound with its intrinsic molecular parameters.

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In this report, metal organic frameworks (MOFs) are designed and tuned for the structural variations in order to induce the metal capture which in turn directs the dye adsorption properties....