Journal of Coordination Chemistry Vol. 58, No. 12, 15 August 2005, 1063–1069 Studies on mononuclear chelates derived from substituted Schiff-base ligands (part 7): synthesis and characterization of a new naphthyliden-p-aminoacetophenoneoxime and its complexes with Co(II), Ni(II), Cu(II) and Zn(II) ERDAL CANPOLAT* and MEHMET KAYA Department of Chemistry, Faculty of Arts and Sciences, University of Firat, 23119, Elazıg, Turkey (Received 28 June 2004; revised 28 September 2004; in final form 31 March 2005) In this study, the new ligand, naphthyliden-p-aminoacetophenoneoxime (LH) was synthesized starting from p-aminoacetophenoneoxime and 2-hydroxy-1-naphthaldehyde. Mononuclear complexes with a metal ligand ratio of 1 : 2 have been prepared with Co(II), Ni(II), Cu(II) and Zn(II) salts. Their structures have been elucidated on the basis of elemental analyses, IR, 1 H- and 13 C-NMR spectra, UV-Vis spectra, magnetic susceptibility measurements, molar conductivity and thermogravimetric analyses (TGA). Keywords: Schiff bases; Transition metal complexes 1. Introduction Schiff-base transition metal complexes are of interest in inorganic chemistry and have been studied extensively [1]. Complexes of transition metal ions with bidentate Schiff bases containing nitrogen and oxygen donor atoms play an important role in biological systems and represent interesting models for metalloenzymes that catalyze the reduction of nitrogen and oxygen [2]. Schiff-base metal complexes have industrial, antifungal and biological applications [3]. Research on liquid crystals discovered that introduction of lateral polar hydroxy groups enhances the molecular polarizability as well as stabilizing the liquid crystalline compounds [4]. Although the redox behavior of a number of metal complexes containing Schiff-base ligands is known, the electrochemical properties of such complexes are not completely clear [5]. Also Schiff bases and their complexes in aqueous solutions have interesting and important properties [6]. In this article, *Corresponding author. Email: ecanpolat@firat.edu.tr Journal of Coordination Chemistry ISSN 0095-8972 print: ISSN 1029-0389 online ß 2005 Taylor & Francis Group Ltd DOI: 10.1080/00958970500122565