Abstract
Two benzoyl phenylthiourea derivatives namely: 1-benzoyl-3-(4-bromophenyl)-2- thiourea (M) and 1-(4-chlorobenzoyl)-3-(4-methylphenyl)-2-thiourea (MI) were successfully synthesized and characterized by using Carbon, Hydrogen and Nitrogen (CHN) micro elemental analysis, Fourier Transform Infra-Red (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy methods. Elemental analysis for M (C14H11N2SOBr) and MI (C15H13N2SOCl) were compatible with the expected theoretical calculation. The FTIR spectrum obtained for M and MI compounds show the presence of four important functional groups; ʋ(N-H), ʋ(C=O), ʋ(C-N) and ʋ(C=S) that appeared at 3380-3367 cm-1, 1666-1681 cm-1, 1342-1268 cm-1 and 1146-1152 cm-1, respectively. The NMR spectrum data for MI shows the chemical shift at 6.63-7.85 ppm for Ar-H group, 2.26-2.40 ppm for methyl group, 7.44 ppm for N1H and 3.09 ppm for N2H. For the application, M and MI were used as probes in detecting Cd2+ in methanol solution. UV-Visible spectrophotometer was used to analyze the absorbance values of the compound before and after Cd2+ was added. It is found that compound M displayed the behavior of ‘turn off’ sensors while compound MI possessed the behavior of ‘turn on’ when detecting 0.5×10-5 M and 1×10- 5 M of Cd2+ ion. The behavior of ‘turn on’ and ‘turn off’ is due to the increasing or decreasing of absorbance when Cd2+ was added to the compounds.
Highlights
Environmental pollution by heavy metals become more serious
The Fourier Transform Infra-Red (FTIR) spectra show the presence of important functional groups with stretching bands at the certain wavenumber, and the structure of compound can be predicted with the aid from 1H Nuclear Magnetic Resonance (NMR) spectra
As for application part, M and MI were used as probes in detecting Cd2+ in methanol solution
Summary
Environmental pollution by heavy metals become more serious. This due to anthropogenic activities and the waste are released into the environment. The released metals (lead, cadmium, copper, and zinc) are not ecological that can cause environmental pollution, public health, and economic impacts. These released metals have several applications in common consumer products and basic engineering works, paper and pulp industries, leather tanning, plastic stabilizers, and batteries (Halawa and Zabin, 2015). Graphite furnace atomic absorption spectrometry (AAS), ion selective membrane, inductively coupled plasma atomic emission spectrometry (ICP-MS), voltammetry and liquid chromatography-mass spectrometry. Their operations involve expensive and complex instrumentations (Zhang et al, 2013).
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