Synthesis and Evaluation of Iron (III)-Red Onion Skin Extract Azo Complexes as Pigments for Surface Coatings in Oilfield Environment
A. A. Akaho *
World Bank Africa Centre of Excellence for Oilfield Chemicals Research, University of Port Harcourt, Nigeria.
U. J. Chukwu
Department of Pure and Industrial Chemistry, University of Port Harcourt, Nigeria.
O. Akaranta
World Bank Africa Centre of Excellence for Oilfield Chemicals Research, University of Port Harcourt, Nigeria and Department of Pure and Industrial Chemistry, University of Port Harcourt, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Red Onion skin extract (ROSE) -azo compound of 2-aminobenzoic acid and Iron (III) metal complex of the azo compound (Fe-ABmROSE) were synthesized and characterized using FT-IR spectroscopy, UV-Visible absorption spectroscopy and Scanning electron microscopy. The IR Spectra showed the values of N=N- stretching frequency of 1496.81cm-1 at 1500 cm-1 in ABmROSE. This stretching frequency is absent in the Fe-ABmROSE. This is an indication of the involvement of the N=N- bond in coordination to the metal. ABmROSE shows an absorption maximum at 560.1 nm. This band was shifted to 310 nm in Fe-ABmROSE. This suggests an interaction between the Fe and the azo compound.
Keywords: 2-aminobenzoic acid, red onion skin extract, Fe-ABmROSE, complex, diazotization