ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis, thermal stability, electronic features, and antimicrobial activity of phenolic azo dyes and their Ni(II) and Cu(II) complexes

Selma Bal, Sedat Salih Bal, Abdullah Erener, Hatice Nur Halipci, and Seyhan Akar

Chemistry Department, Science and Arts Faculty, Kahramanmaras Sutcu Imam University, Avsar Kampusu, 46100, Kahramanmaras, Turkey

E-mail: selmadagli9@hotmail.com

Abstract: Four water soluble azo dyes, 4-(isopropyl)-2-[(E)-(4-chlorophenyl)diazenyl]phenol (L ¹), 4-(isopropyl)-2-[(E)-(2,4-dichlorophenyl)diazenyl]phenol (L²), 4-(sec-butyl)-2-[(E)-(4-chlorophenyl) diazenyl]phenol (L ³), 4-(sec-butyl)-2-[(E)-(2,4-dichlorophenyl)diazenyl]phenol (L ⁴), and their Cu(II) and Ni(II) complexes were synthesized and characterized using spectroscopic methods. Examination of their thermal stability revealed similar decomposition temperature of approximately 260–300°C and that they were more thermally stable than their metal complexes. Ni(II) complexes of ligands L² and L⁴ were more stable than the other coordination compounds. Among the synthesized ligands, L² and the complexes Cu(L³)₂ and Ni(L⁴)₂ showed both antimicrobial and antifungal activity. However, the other ligands and the complexes were poorly active against selected microorganisms.

Keywords: azo – complexes – thermal – antimicrobial – electronic features

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0465-y

Chemical Papers 68 (3) 352–361 (2014)