Amido Black 10B Dye Copper Complex�Synthesis, Characterization and Color Analysis

Maria Elena Radulescu-Grad,Alfa-Xenia Lupea,Adelina Andelescu,Gabriela Vlase,Simona Popa,Gheorghe Ilia

doi:10.37358/rc.20.8.8276

Abstract

The present paper presents the obtaining and the characterization of a new complex acid dye by combining the transition metal Cu (II) with an azo acid dye, namely Amido Black 10B (C.I. 20.470), as ligand. The ligand and the resulted new azo complex were characterized by FT/IR spectroscopy, UV-Vis spectroscopy, AAs spectrometry, thermal analysis, and PXRD spectrometry. The structure of the ligand and the structure of the new synthesized copper complex were elucidated by all the above mentioned analysis methods. The formation of the azo metal complex with Cu(II) was confirmed by UV-Vis spectrum. Thermogravimetric and spectral analysis reveal its different stability in the air and nitrogen atmosphere, with high nitrogen stability. The PXRD analysis shows crystalline structure for the copper complex. At the same time, the color analysis was performed for the ligand and the synthesized complex in powder by means of UV-Vis CIEL*a*b* color space parameters, under the CIE recommended illuminants: D65 (natural day light), A (incandescent light) and F2 (fluorescent light) under the standard 10� observer angle. An important color phenomenon, namely metamerism, was highlighted for the complex, as well. Due to the presence of the Cu (II) ions, this azo complex presents a different color, calculated by the color differences AE*ab and AC*, a superior saturation and color strength than its ligand.

Highlights

The azo chemical compounds are still in the attention of the scientific research, especially the azo dyes, a class of synthetic, colored organic compounds, which contain one or more azo bonds (–N=N–), is mentioned [1,2]
Considering the importance of the complex dyes, this paper presents the synthesis, the characterization, and the color properties of a new copper complex, using Amido black 10B, an azo acid dye, as ligand
The Cu (II) ion as transition metal and the acid dye Amido black 10B (C.I. 20.470) as ligand were used in the synthesis of a one new complex

Summary

Introduction

The azo chemical compounds are still in the attention of the scientific research, especially the azo dyes, a class of synthetic, colored organic compounds, which contain one or more azo bonds (–N=N–), is mentioned [1,2]. The coordinated complexes of azo ligands, included in different classes with transition metals (Cu; Zn; Cr; Co; Ag, Cd etc.), are nowadays of interest due to the various and unexpected physical, chemical, photophysical, photochemical and catalytic properties. Some of these compounds are known to be involved in biological reactions (anti-fungal diseases, antioxidant activity, DNA affinity) [12,13,14], in high density optical data storage, due to their good light and thermal stability properties [15,16], in solar cells and photo sensitizers [17,18]. Considering the importance of the complex dyes, this paper presents the synthesis, the characterization, and the color properties of a new copper complex, using Amido black 10B, an azo acid dye, as ligand

Materials and methods

Results and discussions

Conclusions