Abstract
Films of 2-(azulen-1-yldiazenyl)-5-phenyl-1,3,4-thiadiazole (T) were successfully deposited on glassy carbon surfaces to prepare chemically modified electrodes (CMEs). Their surface characterization was analyzed by electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). This complexing monomer has been deposited through direct electropolymerization in conditions established during the electrochemical characterization of T performed by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and rotating disk electrode voltammetry (RDE). These methods put in evidence the high degree of asymmetry of oxidation and reduction curves, which is due to the irreversible processes occurring at opposite potentials. The film formation was confirmed by ferrocene redox assay probe. The properties of the electrodes modified with T (T-CMEs) were investigated for sensing heavy metal (HM) ions in water solutions, with promising results for Pb(II) among Cd(II), Cu(II), and Hg(II) ions.
Highlights
Knowledge on the relationships between structure, properties and performance is essential for chemically modified electrode (CME) applications in all areas of interest.They can be characterized by microscopic techniques that are used in various industrial applications, including topographic and dynamic surface studies [1,2,3,4,5] and in medical diagnosis [6]
This paper provides the data of the results obtained for CMEs based on the T ligand
The binding of thiadiazole to an azulene residue is an unexploited subject in the literature and creates the premise for recognition of heavy metal (HM) using CMEs based on T
Summary
Knowledge on the relationships between structure, properties and performance is essential for chemically modified electrode (CME) applications in all areas of interest. This azulene derivative belongs to the diazene compounds, which can be used for technical purposes, such as preparation of nematic liquid crystals [8], compounds with special optical properties [9], photosensitive materials [10], and chromophores [11]. T revealed interesting properties as possible inhibitory activity against Escherichia coli or Mycobacterium tuberculosis as resulted from previous in silico studies conducted by molecular docking simulations These promising preliminary results highlighted new opportunities of several structures derived from thiadiazoles coupled with azulene moieties as possible antimicrobial agents [17]. The study of the surface properties of T-CMEs revealed: (1) new aspects of film morphology obtained in different conditions and (2) the role of electrosynthesis potential in electrode nanostructuring, with direct consequences on sensing capacity
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