Sulfonated salicylidene thiadiazole complexes with Co (II) and Ni (II) ions as sustainable corrosion inhibitors and catalysts for cross coupling reaction

Abstract

Condensation of 2,5-dihydrazinyl thiadiazole with 5-sodium sulfonate salicylaldehyde afforded dibasic tetradentate pincer N,O,O,N-salicyldiene thiadiazole ligand (H 2 Sanp). The novel dipolar ligand formed para-magnetic pincer complexes within Co (II) and Ni (II) ions (Co-Sanp and Ni-Sanp) under sustainable conditions. The water-soluble ligand and its metal-complexes were estimated by mass, IR and UV-Visible spectroscopy, EA (elemental analyses), TGA (Thermogravimetric analyses), magnetic susceptibility, and conductivity measurements. The catalytic reactivity of Co-Sanp and Ni-Sanp were evaluated in the Suzuki and Buchwald-Hartwig cross coupling reaction in aqueousmethanol binary mixtures. Both reactions of boronic acid or aryl amines with aryl halides gave high chemoselective yield of C-C or C-N product. The inhibition characteristics of H 2 Sanp and its Ni-and Co-complexes were performed for the C-steel corrosion in 1.0 M HCl using electrochemical measurements and surface analysis methods. These methods indicated that the synthesized compounds have served as efficient mixed-type corrosion inhibitors and their adsorption on the steel surface obeyed isotherm model of Langmuir. Co-Sanp inhibitor displays the best corrosion inhibition efficiency, and the capacity is up to 97.11% at of 250 mg L −1 . Surface analysis confirms formation of protective layer on the C-steel surface.

Nickel-Catalyzed Suzuki–Miyaura Coupling in Water for the Synthesis of 2-Aryl Allyl Phosphonates and Sulfones

“…The Ni-Sanp complex is also able to catalyze the Suzuki−Miyaura reaction in water; however, the solvent systems of ethanol or ethanol−water (1:1) give higher yields than neat water. 45 Compared to Ni(0) catalysts, most Ni (II) salts are readily available and exhibit moisture, air, and thermal stability, making them potential precatalysts for conducting cross-coupling reactions in water without the need for prior treatment. In this study, we developed a straightforward and efficient protocol utilizing a NiSO 4 •6H 2 O/cationic 2,2′-bipydyl system to catalyze the cross-coupling of 2-haloallyl phosphonates and sulfones with a broad scope of commercially available arylboronic acids in neat water, giving the corresponding 2-aryl allyl phosphonates and sulfones under environmentally friendly conditions (Scheme 1).…”

“…Several reports have described that an excess amount of water is deleterious to Ni-catalyzed Suzuki–Miyaura coupling; hence, only a few reports have used water as the sole reaction medium, which includes the employment of Ni nanoparticles and Ni­(cod) 2 as catalysts. The Ni-Sanp complex is also able to catalyze the Suzuki–Miyaura reaction in water; however, the solvent systems of ethanol or ethanol–water (1:1) give higher yields than neat water . Compared to Ni(0) catalysts, most Ni­(II) salts are readily available and exhibit moisture, air, and thermal stability, making them potential precatalysts for conducting cross-coupling reactions in water without the need for prior treatment.…”

Bishydrazone ligand and its Zn-complex: synthesis, characterization and estimation of scalability inhibition mitigation effectiveness for API 5L X70 carbon steel in 3.5% NaCl solutions

“…6 Transition metal complexes have found extensive applications in various fields, including electrocatalysis, 7 sensing materials, 8 biological probes, 9 and catalysts. 10 Studies on metal complexes containing heterocyclic ligands 11,12 and Schiff bases 13,14 have demonstrated their inhibitory efficacy against corrosion in acidic environments. Mahdavian et al 15 also reported the effectiveness of diverse transition-metal complexes of acetylacetonate in protecting against corrosion.…”

Novel Pyrazole‐Based Transition Metal Complexes: Spectral, Photophysical, Thermal and Biological Studies

“…Schiff base ligands preferably bind with the transition metals like Cu, Mn, Co, Ni and Fe. A portion of these metal complexes have been read up in extraordinary arrangement for their different designs, steric effects and their coordination science [34] …”