Mixed ligand metal-complexes of tridentate N, N, S pyrazole containing Schiff base and 2-amino-1-ethylbenzimidazole: Synthesis, structure, spectroscopic studies and quantum-chemical calculations. (5th September 2017)

• Record Type: Journal Article
• Authors: Vlasenko, V.G.; Garnovskii, D.A.; Aleksandrov, G.G.; Makarova, N.I.; Levchenkov, S.I.; Trigub, A.L.; Zubavichus, Ya.V.; Uraev, A.I.; Koshchienko, Yu.V.; Burlov, A.S.
• Is Part Of: Polyhedron. Volume 133(2017)
• Page Start: 245
• Page End: 256
• Publication Date: 2017-09-05
• Subjects: Heteroaromatic tridentate Schiff base -- 2-Amino-1-ethylbenzimidazole -- Adducts -- UV–Vis spectra -- DFT calculations; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2017.05.048
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: The series of adducts of 2-amino-1-ethylbenzimidazole in Cu(II), Co(II), Zn(II) and Ni(II) chelates with N, N, S ligand environment were synthesized and characterized. The assignment and the nature of the electronic transitions observed in the UV-vis spectra of chelates were analyzed using time-dependent (TD) DFT calculations. Abstract: The synthesis of a series of adducts of 2-amino-1-ethylbenzimidazole (L 1 ) in Cu(II), Co(II), Zn(II) and Ni(II) chelates of the N, N, S tridentate basic form of the tosylamino functionalized pyrazol containing Schiff base N-[2-[[3-methyl-1-phenyl-5-thioxo-pyrazole-4-ylidenemethyl]amino]phenyl]-4-methylbenzenesulfonamide (H2 L) with common formula [M(L)L 1 ] was performed. The compounds were characterized with C, H, N elemental analysis, FT-IR, 1 H NMR, X-ray absorption spectroscopy and magnetic measurements. Crystal structure of nickel complex [Ni(L)L 1 ] showed that the 2-amino-1-ethylbenzimidazole co-ligand is coordinated through the endocyclic nitrogen atom of pyridine type. The assignment and the nature of the electronic transitions observed in the UV–Vis spectra of chelates were analyzed using time-dependent (TD) DFT calculations.