(E)-4-(((2-amino-5-chlorophenyl)imino)methyl)-5-(hydroxy-methyl)-2-methylpyridin-3-ol and its Cu(II) complex: Synthesis, DFT calculations and aim analysis

Morteza Yavari, Ali Beyramabadi, Ali Morsali, Reza Bozorgmehr
2020 Journal of the Serbian Chemical Society  
Herein, the (E)-4-(((2-amino-5-chlorophenyl)imino)methyl)-5-(hydroxymethyl)-2-methylpyridin-3-ol [= HL] Schiff base and its [Cu(L)Cl] complex have been newly synthesized and characterized by several spectroscopies methods. In addition, the density functional theory (DFT) methods were used for investigation on the tautomerization of the HL Schiff base, structural parameters of the HL and [Cu(L)Cl] species, assignment of the IR vibrational bands and the NMR chemical shifts as well as the Natural
more » ... ell as the Natural Bond Orbital (NBO) analyses. The most stable tautomer of the HL Schiff base is the Enol form of the meta isomer. Optimized geometry of the free HL Schiff base is not planar. The L-anion acts as a N2O tridentate ligand, which bonded to the Cu 2+ ion via the deprotonated phenolic oxygen, the amine and azomethine nitrogens. The [Cu(L)Cl] complex has a square planar geometry, in which the chloro ligand occupies the fourth coordination position. The DFT-computed values are in good consistency with the corresponding experimental values, confirming suitability of the optimized geometries for the HL and [Cu(L)Cl] species. According to the high-energy gaps, these compounds are stable. The atoms in molecule (AIM) analysis was used to evaluate strength of the bonding interactions and electron densities in structure of the compounds.
doi:10.2298/jsc191010022y fatcat:fsn2rvc435gt5ns3xyaqo5uk7a