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Electrochemistry of Organic and Organometallic Compounds
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Electrochemistry of Organic and Organometallic Compounds

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Electrochemistry".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 4331

Special Issue Editor

Dr. Angel A. J. Torriero

E-Mail Website
Guest Editor
School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, Burwood, VIC 3125, Australia
Interests: electroanalytical chemistry; bioelectrochemistry; electrocatalysis

Special Issue Information

Dear Colleagues,

Electrochemical processes are closer to us than we may believe. Actually, we cannot live without electrochemical reactions, as they are fundamental for the photosynthetic production of chemical energy, for proper human cell functioning and even for transmitting signals through the nervous system.

Electrochemistry is considered a relatively green and sustainable method to synthesise organic molecules and conductive polymeric materials, and for the synthesis, application and characterisation of organometallic complexes since it does not require the continuous use of hazardous reagents and can generate less waste than conventional chemistry techniques and procedures. The products obtained from the processes mentioned above have a high industrial value. They fulfil a critical role in different technologies, such as solar cells, wind turbines, batteries, mining, biosensors, electronic circuits, organic light-emitting diodes (OLEDs) used in the latest digital displays, anticorrosive, metallic and heat-resistant coatings, electrochromism, and supercapacitors, just to mention a few examples. Therefore, to keep innovating in these fields, I warmly invite you to contribute to this Special Issue with original research articles, communications or review articles related to the use of electrochemistry in the synthesis, characterisation and/or application of organic or organometallic molecules to any sample of your interest.

Dr. Angel A. J. Torriero
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electrochemistry
  • cyclic voltammetry
  • complexes
  • organic molecules

Published Papers (4 papers)

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Research

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12 pages, 10102 KiB  
Article
Near-IR Electrochromic Film with High Optical Contrast and Stability Prepared by Oxidative Electropolymerization of Triphenylamine Modified Terpyridine Platinum(II) Chloride
by Huiying Gu, Xiaomeng Sun, Qian Zhao, Hongwei Wang, Xinfeng Cheng, Chunxia Yang and Dongfang Qiu
Molecules 2023, 28(24), 8027; https://doi.org/10.3390/molecules28248027 - 09 Dec 2023
Viewed by 782
Abstract
Terpyridine (TPY) platinum(II) chloride with a triphenylamine (TPA) group was successfully synthesized. The strong intramolecular Donor(TPA)-Acceptor(TPY) interaction induced the low-energy absorption band, mixing the spin-allowed singlet dπ(Pt)→π*(TPY) metal-to-ligand charge transfer (MLCT) with the chloride ligand-to-metal charge transfer (LMCT) and chloride ligand-to-ligand (TPY) charge [...] Read more.
Terpyridine (TPY) platinum(II) chloride with a triphenylamine (TPA) group was successfully synthesized. The strong intramolecular Donor(TPA)-Acceptor(TPY) interaction induced the low-energy absorption band, mixing the spin-allowed singlet dπ(Pt)→π*(TPY) metal-to-ligand charge transfer (MLCT) with the chloride ligand-to-metal charge transfer (LMCT) and chloride ligand-to-ligand (TPY) charge transfer (LLCT) transitions, to bathochromically shift to λmax = 449 nm with significant enhancement and broadening effects. Using the cyclic voltammetry method, its oxidative electropolymerization (EP) films on working Pt disk and ITO electrodes were produced with tunable thickness and diffusion controlled redox behavior, which were characterized by the SEM, EDS, FT-IR, and AC impedance methods. Upon applying +1.4 V voltage, the sandwich-type electrochromic device (ECD) with ca. 290 nm thickness of the EP film exhibits a distinct color transformation from red (CIE coordinates: L = 50.75, a = 18.58, b = 5.69) to dark blue (CIE coordinates: L = 45.65, a = −1.35, b = −12.49). Good electrochromic (EC) parameters, such as a large optical contrast (ΔT%) of 78%, quick coloration and bleaching response times of 2.9 s and 1.1 s, high coloration and bleaching efficiencies of 278.0 and 390.5 C−1·cm2, and good cycling stability (maintains 70% of the initial ΔT% value after 3200 voltage switching cycles), were obtained. Full article
(This article belongs to the Special Issue Electrochemistry of Organic and Organometallic Compounds)
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14 pages, 8176 KiB  
Article
New Spectroelectrochemical Insights into Manganese and Rhenium Bipyridine Complexes as Catalysts for the Electrochemical Reduction of Carbon Dioxide
by Alice Barbero, Laura Rotundo, Chiara Reviglio, Roberto Gobetto, Romana Sokolova, Jan Fiedler and Carlo Nervi
Molecules 2023, 28(22), 7535; https://doi.org/10.3390/molecules28227535 - 10 Nov 2023
Viewed by 987
Abstract
This study aimed to demonstrate the behavior of different complexes using IR spectroelectrochemistry (SEC), a technique that combines IR spectroscopy with electrochemistry. Four different Mn and Re catalysts for electrochemical CO2 reduction were studied in dry acetonitrile. In the case of Mn(apbpy)(CO) [...] Read more.
This study aimed to demonstrate the behavior of different complexes using IR spectroelectrochemistry (SEC), a technique that combines IR spectroscopy with electrochemistry. Four different Mn and Re catalysts for electrochemical CO2 reduction were studied in dry acetonitrile. In the case of Mn(apbpy)(CO)3Br (apbpy = 4(4-aminophenyl)-2,2′-bipyridine), SEC suggested that a very slow catalytic reduction of CO2 also occurs in acetonitrile in the absence of proton donors, but at rather negative potentials. In contrast, the corresponding Re(apbpy)(CO)3Br clearly demonstrated slow catalytic conversion at the first reduction potential. Switching to saturated CO2 solutions in a mixture of acetonitrile and 5% water as a proton donor, the SEC of Mn(apbpy)(CO)3Br displayed a faster catalytic behavior. Full article
(This article belongs to the Special Issue Electrochemistry of Organic and Organometallic Compounds)
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12 pages, 3295 KiB  
Article
Electrochemical Disposable Biosensor to Monitor Dabigatran in Point-of-Care Anticoagulation Therapy
by Ashwin K. V. Mruthunjaya, Ronald C. Chatelier and Angel A. J. Torriero
Molecules 2023, 28(13), 4953; https://doi.org/10.3390/molecules28134953 - 23 Jun 2023
Cited by 4 | Viewed by 1021
Abstract
Dabigatran etexilate, an oral prodrug, is often used to treat complications linked to thrombosis. Dabigatran (DAB, active form) does not need to be monitored. However, there are several conditions, such as reduced renal function, traumatic bleeding, emergency surgery, the need for thrombolytic therapy [...] Read more.
Dabigatran etexilate, an oral prodrug, is often used to treat complications linked to thrombosis. Dabigatran (DAB, active form) does not need to be monitored. However, there are several conditions, such as reduced renal function, traumatic bleeding, emergency surgery, the need for thrombolytic therapy in acute stroke, or the requirement to use other forms of anticoagulation, where knowing the concentration of DAB in the blood is indispensable. Unfortunately, there are no convenient DAB-specific point-of-care tests available. To solve this problem, two disposable sensors were constructed and optimised in this work to detect the anticoagulant drug DAB using novel co-facing disposable electrodes, which allows a calibration-free quantitation of the electroactive mediator concentration. A trypsin-based sensor was evaluated. This sensor performed well in a 10 mM Tris buffer (pH 8.8) solution. However, trypsin was inhibited by alpha-1 antitrypsin when a plasma sample was introduced into the sensor. This problem was overcome by plasma filtration. This sensor showed a detection limit of 50.7 ng mL−1 DAB in plasma and a quantification range of 177–500 ng mL−1. A thrombin-based sensor was also constructed. This sensor performed well in ten-fold diluted plasma, overcoming the filtration problem observed with the trypsin-based sensor. This sensor showed a detection limit of 9.6 ng mL−1 DAB in plasma and a quantification range of 11.5–140 ng mL−1. Its extensive pH stability range, the possibility of working at physiological pH, low volume, low cost, and fast turnaround response (less than 20 s) make the calibration-free thrombin-based sensor a suitable point-of-care test to measure DAB concentration in the blood. Full article
(This article belongs to the Special Issue Electrochemistry of Organic and Organometallic Compounds)
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Review

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27 pages, 8176 KiB  
Review
Electrochemistry of Flavonoids
by Dorota Naróg and Andrzej Sobkowiak
Molecules 2023, 28(22), 7618; https://doi.org/10.3390/molecules28227618 - 16 Nov 2023
Cited by 1 | Viewed by 1024
Abstract
This review presents a description of the available data from the literature on the electrochemical properties of flavonoids. The emphasis has been placed on the mechanism of oxidation processes and an attempt was made to find a general relation between the observed reaction [...] Read more.
This review presents a description of the available data from the literature on the electrochemical properties of flavonoids. The emphasis has been placed on the mechanism of oxidation processes and an attempt was made to find a general relation between the observed reaction paths and the structure of flavonoids. Regardless of the solvent used, three potential regions related to flavonoid structures are characteristic of the occurrence of their electrochemical oxidation. The potential values depend on the solvent used. In the less positive potential region, flavonoids, which have an ortho dihydroxy moiety, are reversibly oxidized to corresponding o-quinones. The o-quinones, if they possess a C3 hydroxyl group, react with water to form a benzofuranone derivative (II). In the second potential region, (II) is irreversibly oxidized. In this potential region, some flavonoids without an ortho dihydroxy moiety can also be oxidized to the corresponding p-quinone methides. The oxidation of the hydroxyl groups located in ring A, which are not in the ortho position, occurs in the third potential region at the most positive values. Some discrepancies in the reported reaction mechanisms have been indicated, and this is a good starting point for further investigations. Full article
(This article belongs to the Special Issue Electrochemistry of Organic and Organometallic Compounds)
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