1
|
Kerschbaumer A, Wielend D, Leeb E, Schimanofsky C, Kleinbruckner N, Neugebauer H, Irimia-Vladu M, Sariciftci NS. How to use a rotating ring-disc electrode (RRDE) subtraction method to investigate the electrocatalytic oxygen reduction reaction? Catal Sci Technol 2023; 13:834-843. [PMID: 36760341 PMCID: PMC9900597 DOI: 10.1039/d2cy01744j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022]
Abstract
When studying electrochemical oxygen reduction reactions in homogeneous media, special attention must be given to the significant background activity present with conventional electrode materials. The intrinsic electrocatalytic activity of different materials can be investigated using complementary methods, such as the rotating ring-disc electrode (RRDE) technique and chronoamperometric electrolysis with product quantification. This report presents a detailed investigation of the electrocatalytic ability of hydroxy anthraquinone derivatives and riboflavin towards hydrogen peroxide (H2O2) production via a novel RRDE subtraction method together with chronoamperometric electrolysis. Qualitative trends linking the two methods were obtained, such as a higher excess current correlating with both higher productivity and selectivity. As such, a valuable tool is provided to increase the understanding of the electrocatalytic ability of homogeneous solutions toward improving the oxygen reduction reaction.
Collapse
Affiliation(s)
- Angelina Kerschbaumer
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Dominik Wielend
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Elisabeth Leeb
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Corina Schimanofsky
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Nadine Kleinbruckner
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Helmut Neugebauer
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Mihai Irimia-Vladu
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| | - Niyazi Serdar Sariciftci
- Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria
| |
Collapse
|
2
|
Golczak A, Insińska-Rak M, Davoudpour A, Hama Saeed D, Ménová P, Mojr V, Cibulka R, Khmelinskii I, Mrówczyńska L, Sikorski M. Photophysical properties of alloxazine derivatives with extended aromaticity - Potential redox-sensitive fluorescent probe. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 272:120985. [PMID: 35152097 DOI: 10.1016/j.saa.2022.120985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/26/2022] [Accepted: 01/29/2022] [Indexed: 06/14/2023]
Abstract
The spectral and photophysical properties of two four-ring alloxazine derivatives, naphtho[2,3-g]pteridine-2,4(1H,3H)-dione (1a) and 1,3-dimethylnaphtho[2,3-g]pteridine-2,4(1H,3H)-dione, (1b) were studied. The propensity of 1a for excited-state proton transfer reactions in the presence of acetic acid as a catalyst was also studied, showing no signature of the reaction occurring. In addition, quenching of 1a fluorescence by acetic acid was investigated. Singlet and triplet states and spectral data for 1a and 1b were calculated using density functional theory TD-DFT at B3LYP/6-31G(d) and UB3LYP levels. Finally, fluorescence lifetime imaging microscopy (FLIM) using 1a and 1b as fluorescence probes was applied to in vitro human red blood cells (RBCs) with and without tert-butyl hydroperoxide (TB) as an oxidising agent. To evaluate and compare the effects of 1a and 1b on the redox properties of RBCs, the fluorescence lifetime, amplitude and fractional intensities were calculated, and phasor plot analysis was performed. The results obtained show the appearance of a new proximal cluster in the phasor fingerprint of RBCs in the presence of 1b and a shorter fluorescence lifetime of RBCs in the presence of 1a.
Collapse
Affiliation(s)
- Anna Golczak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Małgorzata Insińska-Rak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Amirali Davoudpour
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Daban Hama Saeed
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Petra Ménová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech Republic
| | - Viktor Mojr
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech Republic
| | - Radek Cibulka
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech Republic
| | - Igor Khmelinskii
- Department of Chemistry and Pharmacy, Faculty of Sciences and Technology and Centre for Electronics, Optoelectronics and Telecommunications, University of the Algarve, 8005-139 Faro, Portugal
| | - Lucyna Mrówczyńska
- Faculty of Biology, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 6, 61-614 Poznań, Poland.
| | - Marek Sikorski
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
| |
Collapse
|
3
|
Cigánek M, Richtár J, Weiter M, Krajčovič J. Organic π‐Conjugated Molecules: From Nature to Artificial Applications. Where are the Boundaries? Isr J Chem 2021. [DOI: 10.1002/ijch.202100061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Martin Cigánek
- Brno University of Technology Faculty of Chemistry Materials Research Centre Purkyňova 118 612 00 Brno Czech Republic
| | - Jan Richtár
- Brno University of Technology Faculty of Chemistry Materials Research Centre Purkyňova 118 612 00 Brno Czech Republic
| | - Martin Weiter
- Brno University of Technology Faculty of Chemistry Materials Research Centre Purkyňova 118 612 00 Brno Czech Republic
| | - Jozef Krajčovič
- Brno University of Technology Faculty of Chemistry Materials Research Centre Purkyňova 118 612 00 Brno Czech Republic
| |
Collapse
|