Spectroscopic, structural, thermal and antimicrobial studies of 4,6-bis (4-chlorophenyl)- 2-oxo-1,2-dihydropyridine-3-carbonitrile with some transition metals

Abstract

ABSTRACT. 4,6-Bis(4-chlorophenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile (L) reacted with Mn(II), Fe(III), Co(II) and Ni(II) in methanol and acetone as a solvent at room temperature to form a new solid complexes. The isolated complexes were characterized by elemental analysis, magnetic properties, conductance measurements, mass, IR, UV-Vis and 1 H NMR spectroscopic methods and thermal analyses. The thermogravimetric and infrared spectroscopic data confirmed the presence of water in the composition of the complexes and the ligand reacted as a bidentate. The metal -ligand binding in metal complexes is predicted using density functional theory. The ligand and their metal complexes were also evaluated for their antibacterial activity. The complexes showed high activities compared with free ligand.

Spectroscopic, DFT and antimicrobial activity of Zn(II), Zr(IV), Ce(IV) and U(VI) complexes of N,N‐ chelated 4,6‐bis (4‐chlorophenyl)‐2‐amino‐1,2‐dihydropyridine‐3‐carbinitrile

“…The two bands observed at 3392 and 2205 cm −1 in the spectrum of free ligand have been assigned to the stretching vibration ν(N‐H) and the carbinitrile group ν(C≡N), respectively. The shift of the characteristic peak of N‐H vibration to a lower value from 3392 cm −1 to the region 3311–3132 cm −1 also, the shift of the characteristic peak of the carbinitrile group ν (C≡N), to lower or higher values indicate the chelation of ligand through nitrogen atoms of amino and carbinitrile groups …”

The application of disperse dyes derived from 4-bromoaniline and 3-chloroaniline on to polyester fabric

“…Absorption bands of C-H in the IR spectra were observed between 3093 and 3186 cm -1 . In the 1 H NMR spectra, the broad singlet peaks which appeared at 6.72-7.73 ppm suggest the presence of OH in the synthesised dyes [22]. Absorption bands of C=C stretching vibration were observed at 1583-1675 cm -1 region, suggesting the presence of aromatic rings.…”

Raman spectra of copper, cobalt, and nickel complexes of nicotinic acid: Equilibrium studies

“…Some of these complexes are known to escalate the biological properties of the original ligand thus triggered many researchers to develop new novel complexes between a biologically active ligand and metal ion (usually the transition metal groups) to improve the ligand biological properties. Several analyses which are frequently used to determine the structure of the complex are elemental analysis, Fourier transform infrared (FTIR) spectroscopy, UV-Vis spectroscopy, nuclear magnetic resonance (NMR), and Raman spectroscopy [30][31][32]. Additionally, the conductivity and magnetic susceptibility behavior of the compounds were often observed.…”