Synthesis, crystal structures, magnetic properties and antimicrobial screening of octahedral nickel(II) complexes with substituted quinolin-8-olates and pyridine ligands

• Published in: Journal of molecular structure Vol. 1200; p. 127106
• Main Authors: Basu Baul, Tushar S., Nongsiej, Khrawborlang, Ka-Ot, Augustine Lamin, Joshi, Santa Ram, Rocha, Bruno G.M., Guedes da Silva, M. Fátima C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2020
• Subjects: Antimicrobial activity; Magnetic moment; Nickel; Pyridine derivative; Structure elucidation; Substituted quinolin-8-olate; Substituted quinolin-8-olate; Antimicrobial activity; Nickel; Pyridine derivative; Structure elucidation; Magnetic moment
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2019.127106

New nickel(II) compounds, viz. trans-[Ni(LHAQ)2(Py)2]·C6H6 (1), cis-[Ni(LHAQ)2(3-MePy)2] (2), cis-[Ni(L2−MeAQ)2(3-MePy)2] (3), trans-[Ni(L4−MeAQ)2(Py)2]·C6H6 (4), trans-[Ni(L4−OMeAQ)2(Py)2]·C6H6 (5), trans-[Ni(L4−OEtAQ)2(Py)2]·C6H6 (6), trans-[Ni(L4−BrAQ)2(Py)2]·C6H6 (7) and trans-[Ni(L4−ClAQ)2(3-MePy)2]·2(3-MePy) (8) (primary ligands: LXAQ = substituted 5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olate; secondary ligands: Py = pyridine or 3-MePy = 3-methylpyridine) have been synthesized and characterized by elemental analysis, IR, UV–vis spectroscopy. The magnetic susceptibilities of the compounds were also measured. Single-crystal X-ray diffraction analysis of the compounds revealed octahedral geometries with trans configurations for 1, 4–8 and cis configurations for 2 and 3. The occurrence of intramolecular Ni⋅⋅⋅Hpyridine interactions in 2 and in 3, may account for additional stabilization of their assemblies at least in the solid state. The effective magnetic moment (μeff) in the range 3.02–3.40 BM agree with the expected values for octahedral Ni(II) cations with two unpaired electrons. Ni(II) compounds were also screened for their antimicrobial activity. Distorted octahedral nickel(II) complexes with trans- and cis-configurations were synthesized, and their properties and applications are reported. [Display omitted] •Eight new nickel(II) compounds with distorted octahedral geometries have been synthesized.•Structural characterizations of the compounds were accomplished from single crystal X-ray crystallography and magnetic measurements.•Compounds were screened for antibacterial activity.