Polyazulenes Based Materials for Heavy Metal Ions Detection

Oprisanu, Alexandra; Lazar, Ioana Georgiana; Pop, Maria Daniela; Ungureanu, Eleonora‐Mihaela; Isopescu, Raluca; Bîrzan, Liviu

doi:10.37358/rc.17.10.5858

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…The chemical synthesis of electroactive and partially soluble polyazulene was realized via the chemical oxidative polymerization of azulene with iodine and bromine [25], with FeCl 3 [26], or via the polymerization of 1,3-dibromoazulene with Ni(COD) 2 [27]. Electrochemical polymerization was also used with significant results [28,29]. The electronic and structural properties of azulene-based polymers [30] and their optoelectronic and energy applications [31] were carefully investigated.…”

Section: The Dance Of Two or More Azulenes Without Any Spacers ("Danc...mentioning

confidence: 99%

Dancing with Azulene

Razus

2022

Symmetry

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It seems interesting to adopt the idea of dance in the context of the arrangement of molecular blocks in the building of molecular systems. Just as various dances can create various feelings, the nature and arrangement of molecular blocks in the generated molecular system can induce different properties. We consider obtaining such “dancing” systems in which the still little-known azulene moieties are involved. The dark blue nonbenzenoid aromatic azulene has one less axis of symmetry relative to the two axes of its isomer, i.e., the fully benzenoid naphthalene, acquiring valuable properties as a result that can be used successfully in technical applications. In a dancing system, the azulene moieties can be connected directly, or a more or less complex spacer can be inserted between them. Several azulene moieties can form a linear oligomer or a polymer and the involvement of azulene moieties in nonlinear molecules, such as crown ethers, calixarenes, azuliporphyrins, or azulenophane, is a relatively new and intensely studied topic. Some aspects are covered in this review, which are mainly related to obtaining the mentioned azulene compounds and less to their characterization or physico-chemical properties.

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Section: The Dance Of Two or More Azulenes Without Any Spacers ("Danc...mentioning

confidence: 99%

Dancing with Azulene

Razus

2022

Symmetry

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“…These values are listed in Table 3 for oxygen and sulfur derivatives. The data were collected in 0.5 mM solutions of each ligand in 0.1 M tetrabutylammonium perchlorate in acetonitrile [3][4][5]21,22]. The calculated HOMO and LUMO energies (Table 1) were plotted against experimental oxidation and reduction potentials.…”

Section: Correlations Between Dft-calculated Frontier Molecular Orbit...mentioning

confidence: 99%

“…A good result has been observed for Pb (detection limit of 10 −7 M) [4]. The electrochemical study of ligand established the best conditions for obtaining CMEs, which were tested for the recognition of HMs cations with good results for lead and for copper at concentrations lower than 10 −8 M [3]. Modified electrodes based on O3 and S3 ligands have been recently reported for HMs ions recognition [21,22].…”

Section: Introductionmentioning

confidence: 96%

“…Chemically modified electrodes (CMEs) obtained by electrochemical polymerization of differently substituted azulene monomers have been previously tested and characterized by electrochemistry [1,2]. The previously reported data refer to heavy metals (HMs) ions recognition attempts to detect very low concentrations of contaminants such as cadmium, copper, mercury, chromium, cobalt, nickel, or lead in water [3][4][5]. The advantage is certain in the context of health concerns due to the harmful effects of these HMs on humans; their bioaccumulation in the human body causes acute or chronic toxicity, responsible for serious disorders especially at long-term exposure.…”

Section: Introductionmentioning

confidence: 99%

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Properties Assessment by Quantum Mechanical Calculations for Azulenes Substituted with Thiophen– or Furan–Vinyl–Pyridine

et al. 2022

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In this paper, azulenes substituted with thiophen– or furan–vinyl–pyridine are reported as heavy metal ligands in systems based on chemically modified electrodes. We undertook a computational study of their structures using density functional theory (DFT). Based on these computations, we obtained properties and key molecular descriptors related to chemical reactivity and electrochemical behavior. We investigated the correlation between some quantum parameters associated with the chemical reactivity and the complexing properties of the modified electrodes based on these ligands. The best correlations for the parameters were retained. We showed that the linear correlation between DFT-computed HOMO/LUMO energies and experimental redox potentials is very good.

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“…To develop new sensors for HMs ions, 2,6-bis((E)-2-(thiophen-2-yl)vinyl)-4-(5-isopropyl-3,8-dimethylazulen-1-yl) pyridine (L) has been synthesized [18] and characterized [19] by electrochemical techniques. The aim of the present paper is the study of complexing L-CMEs preparation in view of HM ions (Cd, Pb, Cu, Hg) detection.…”

Section: Introductionmentioning

confidence: 99%

Polyazulene Based Materials for Heavy Metal Ions Detection. 4. Search for Conditions for Thiophen-Vinyl-Pyridine-Azulene Based CMEs Preparation

et al. 2022

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The present work is connected to the study of electrode conditioning issues for the chemically modified electrodes (CMEs) prepared based on 2,6-bis((E)-2-(thiophen-2-yl)vinyl)-4-(5-isopropyl- 3,8-dimethylazulen-1-yl) pyridine (L). L is irreversibly electrooxidized to polymers leading to L-CMEs. The recognition experiments are the final test of chosen parameters (electropolymerization potential and charge in controlled potential electrolysis (CPE), anodic limit of the overoxidation cycles (OC), number of OC, anodic limit of the equilibration cycles (EC), number of EC, pH of the buffer solutions for HMs accumulation, complexation time, potential and time of reduction). The evidence of film deposition resulted by the change of ferrocene symmetrical signal characteristics on bare electrode in ferrocene solution was the simplest way to prove the formation of L-CMEs. However, finding the best electrode equilibration conditions turned out to be a source of increasing the analytical performance for the CMEs, especially those dedicated to the detection of Pb. The paper underlines the importance of understanding the role of each varied parameter, and of carrying out a systematic study of each possible variable. Optimum conditions for Pb ions analysis, using this new thiophen-vinyl-pyridine-azulene based CMEs, have been established, in order to get the best conditions for its detection in water.

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Polyazulenes Based Materials for Heavy Metal Ions Detection

Cited by 3 publications

References 8 publications

Dancing with Azulene

Dancing with Azulene

Properties Assessment by Quantum Mechanical Calculations for Azulenes Substituted with Thiophen– or Furan–Vinyl–Pyridine

Polyazulene Based Materials for Heavy Metal Ions Detection. 4. Search for Conditions for Thiophen-Vinyl-Pyridine-Azulene Based CMEs Preparation

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