SINTEZA COMBINAȚIILOR COORDINATIVE ALE CUPRULUI(II) ȘI NICHELULUI(II) ÎN BAZA N(4)-(p-BENZOAT DE ETIL) TIOSEMICARBAZONELOR 5-Br (3,5-di Br) SALICILALDEHIDEI

Abstract

This article aims to synthesize 2 new organic substances N(4)-(p-ethyl-4-benzoate) thiosemicarbazone 5-Br (3,5-diBr) salicylaldehyde. Based on them, 15 coordination compounds of Cu (II) and Ni (II) were obtained. The organic compound was analysed by IR spectroscopy and characterized by 1H and 13C nuclear magnetic resonance (NMR). The coordination compounds were chemically characterized by elemental analysis and IR spectroscopy. On the basis of IR spectroscopy and elemental analysis showed that the ligands were coordinated to the metal tridentate ligands the sulfur-thionic atom, the azomethine nitrogen atom and the oxygen-phenolic atom. After recrystallization {Ni(HL1)NO3}·2H2O in a 1:3 binary solvent mixtures of N,N-dimethylformamide, ethanol. Single crystals have been obtained, and established the structure by X-ray analysis. Where the ligand is double deprotonated, due to the DMF which possesses basic properties and has favored its double deprotonation, coordinates to the central atom through the sulf-thionic atoms, azomethine nitrogen, oxygen-phenolic, the fourth position is occupied by oxygen from the DMF solvent molecule. The compound formed has a plane square geometry, in the outer sphere coordination compound: is a DMF, co-crystallization molecule.