Fabrication of Cobalt-Based Nano-Composite Film for Corrosion Mitigation of Copper in Flow Chloride Medium

Corrosion of metals leads to high maintenance costs, as well as potential threats to structural health and safety. Here, we demonstrate the coating of cobalt tungstate (CoWO4) nanoparticles (NPS)/5-mercapto-1-phenyl-1 H-tetrazole derivative (MPT) used as a nano-composite film on Cu surface for the blocking of micropores to hinder the propagation of metastable pits in an aggressive NaCl medium. The mechanism of interaction between the nanoparticles and tetrazole derivative, in addition to the mode of anchoring to the metal surface and blocking the penetration of chloride ions (Cl−), are all investigated. In this investigation, CoWO4 is synthesized via a wet chemical route and thereafter, is combined with MPT at an optimized ratio thus formulating a nano-composite corrosion inhibitor which in solution gets coated on Cu surface. Atomic force and scanning electron microscopic images of the bare Cu reveal dip pits, which by the coating of the nano-composite are suppressed at the nucleation stage during exposure to the aggressive 3.5% NaCl electrolyte under flow conditions. Electrochemical analysis shows high protection of Cu up to 97% efficiency in the presence of the newly formulated nano-composite inhibitor film.

Synthesis and Antimicrobial Evaluation of Some New Benzoxazinone and Quinazolinone Derivatives

Ring opening reactions of benzoxazinone (2) with nitrogen and oxygen nucleophiles gave the corresponding benzamides (3)&(4) and benzoates (5).Quinazolinone derivatives (6) and (7) were obtained upon treatment of (2) with hydrazine hydrate and/or hydroxylamine hydrochloride.Triazole derivatives (8a – b) were obtained when (2) was subjected to react with semicarbazide and/or thiosemicarbazide respectively. Reaction of (2) with sodium azide gave a mixture of tetrazole derivative (9) and benzoimidazolone derivative (10). The antimicrobial activity of some synthesized compounds was examined against bacteria, fungi and yeast. Some of the tested compounds showed promising activities.

Fully Ir(iii) tetrazolate soft salts: the road to white-emitting ion pairs

The first examples of anionic Ir(iii) bis-tetrazolate complexes and their combination with a cationic Ir(iii)tetrazole derivative forming “fully tetrazolate” Ir(iii) based soft salts as O2-sensitive white emitters are described herein.

The first organocopper tetrazole derivative: synthesis and characterization

1-(5-Amino-3-azapentyl)tetrazole undergoes deprotometallation at the heteroring carbon atom giving an organocopper(ii) tetrazole derivative in which the Cu–C bonds are stabilized by a rigid chelating framework.