Spectroscopic and magnetic studies on some copper (II) complexes of antipyrine Schiff base derivatives

• Published in: Polyhedron Vol. 16; no. 17; pp. 2909 - 2916
• Main Authors: Ismail, Kamal Z., El-Dissouky, Ali, Shehada, Aziza Z.
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 1997; Elsevier
• Subjects: antipyrine; Chemistry; Chemistry, Inorganic & Nuclear; copper(II); Crystallography; magnetism; metal complexes; Physical Sciences; Schiff base; Science & Technology; spectra; Schiff base; metal complexes; magnetism; spectra; copper(II); antipyrine; COORDINATION CHEMISTRY; STEREOCHEMISTRY; COBALT(II); ELECTRON-SPIN RESONANCE; ION; PYRAZOLE-DERIVED LIGANDS; NICKEL(II); HETEROCYCLIC NITROGEN; KETONES
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(97)00061-2

A new series of copper(II) complexes derived from 4-(2-thienyl-methylidene amino) antipyrine (TAAP) and 4-furfurylidene amino antipyrine (FAAP) have been synthesized. The complexes are formulated as [(TAAP)Cu](ClO 4) 2, [(FAAP) 2Cu](ClO 4) 2, [(FAAP)Cu(OH)Br], [L 2CUX 2]· nH 2O and [L 2Cu(NO 3) 2], L  TAAP or FAAP, X  Cl or Br and n = 2 or 1, based on their elemental analyses and infrared spectral data. The infrared data indicate the bidentate nature of both ligands in all complexes except in [(TAAP) Cu](ClO 4) 2 where the ligand acts as a tridentate chelating agent. The electronic and EPR spectral data are used to interpret the nature of bonding of the ligands with the copper(II) ion, ground state and ligand field strength. The room temperature magnetic moments indicate polymeric structure for [(TAAP)CUX 2]· nH 2O, [(TAAP)Cu](ClO 4) 2, and [(FAAP)Cu(OH)Br] and monomeric structure for the rest of the complexes. The biological activity studies of the complexes and the free ligands towards three gram-positive, seven gramnegative bacteria and three fungal species have been studied and the potential is related to the nature and structure of the complexes.