Article
Chemistry, Inorganic & Nuclear
Nicolas Queyriaux, Charlene Esmieu, Arvind K. Gupta, Laure Vendier, Sascha Ott, Maylis Orio, Leif Hammarstrom
Summary: A series of new polypyridyl ruthenium(II) complexes have been synthesized and investigated for their ability to assist electro- and photocatalytic reductive processes. The nature of their reduced species has been studied through computational and spectroscopic techniques.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Elena Cuellar, Alberto Diez-Varga, Tomas Torroba, Pablo Domingo-Legarda, Jose Aleman, Silvia Cabrera, Jose M. Martin-Alvarez, Daniel Miguel, Fernando Villafane
Summary: In this study, a series of new 1,2-azolylamidino complexes were synthesized and characterized using NMR, IR spectroscopy, and X-ray diffraction. Photophysical and electrochemical studies showed that these complexes exhibit good phosphorescence and reversible oxidation properties. Furthermore, the complexes were successfully used as catalysts in the photooxidation of different thioethers, with one of the complexes showing superior catalytic performance compared to a standard ruthenium complex.
INORGANIC CHEMISTRY
(2021)
Article
Electrochemistry
Zinhle Mtshali, Karel G. von Eschwege, Jeanet Conradie
Summary: This study presents the electrochemical behavior of a series of tris(polypyridine) manganese(II) complexes with substituents ranging from electron withdrawing to electron donating. The Mn(II/III) redox couple shows irreversible behavior, which may be attributed to geometry distortion or electron rearrangement upon oxidation. The study also establishes a linear relationship between DFT calculated solvent phase energies and experimental reduction potentials, accurately predicting the reduction potentials of related complexes.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Jingqi Han, Shun-Cheung Cheng, Shek-Man Yiu, Man-Kit Tse, Chi-Chiu Ko
Summary: These new luminescent complexes with environmentally-sensitive dimerization equilibrium can be used as gas sensors for detecting humidity, ammonia, and amine vapors, thanks to their strong interaction with H-bonding donor/acceptor molecules involving diaminocarbene ligand orbitals in the emissive excited state. By responding to amines and humidity and changing the luminescence properties accordingly, a proof-of-principle for binary optical data storage with reversible concealment process has been demonstrated.
Article
Chemistry, Multidisciplinary
Maria-Sophie Bertrams, Katharina Hermainski, Jean-Marc Moersdorf, Joachim Ballmann, Christoph Kerzig
Summary: Metal complex - arene dyads exhibit superior triplet energy transfer compared to parent metal complexes. Unexplored dicationic phosphonium-bridged ladder stilbenes (P-X2+) were identified as efficient quenchers and demonstrated photoinduced electron transfer photochemistry with organic photosensitizers and metal complexes. The pyrene dyads of the tested ruthenium complexes efficiently sensitize the P-X2+ triplets, providing access to normally difficult to obtain acceptor triplets.
Article
Biochemistry & Molecular Biology
Li Zhu, Hui Liu, Yang Dou, Qun Luo, Liangzhen Gu, Xingkai Liu, Qianxiong Zhou, Juanjuan Han, Fuyi Wang
Summary: In this study, the photoactivated ruthenium polypyridine complex ZQX-1 showed selective cytotoxicity to hypoxic and cisplatin-resistant cancer cells, inducing apoptosis and necrosis. It also inhibited DNA repair-related proteins and enhanced the photocytotoxicity of the prodrug.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Environmental Sciences
Xian He, Zhi-neng Hong, Jun Jiang, Ge Dong, Hui Liu, Ren-kou Xu
Summary: The effects and mechanisms of oxidant and acid modification on Cd(II) adsorption by rice straw biochar were investigated. Acid modification was found to be more effective than oxidant modification in increasing carboxyl functional groups on the biochar surfaces, enhancing Cd(II) adsorption. Increasing functional groups on the surfaces of modified biochars effectively enhanced the specific adsorption of Cd(II).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Daniel Pelczarski, Oleksandr Korolevych, Blazej Gierczyk, Maciej Zalas, Malgorzata Makowska-Janusik, Waldemar Stampor
Summary: We present the electric field-induced absorption spectra of tris(bipyridine) Ru(II) complexes and compare them with those of an archetypal [Ru(bpy)(3)](2+) ion. We use the TDDFT method to compute the spectra and explain the mechanism of electroabsorption in tris(bipyridine) Ru complexes. The main EA feature can be attributed to a delocalized and orbitally degenerate excited state.
Review
Agricultural Engineering
Shanshan Sun, Manping Zhang, Xushun Gu, Pan Yan, Shengbing He, Azharuddin Chachar
Summary: This review summarizes the discovery process, electron transfer mechanism, influencing factors and driven microorganisms of the newly discovered iron-nitrogen cycle process of microbial catalyzed NH4+ oxidation coupled with iron reduction (Feammox), and expounds the possibility and potential mechanism of Electron shuttles (ESs) to enhance Feammox efficiency. It highlights the current research situation of Feammox for nitrogen removal and future research directions, including how to apply ESs enhanced Feammox to promote nitrogen removal in practical wastewater treatment. This review provides new ideas for the engineering application research of Feammox and strong theoretical support for its development.
BIORESOURCE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yusuke Kuramochi, Yuto Suzuki, Somyo Asai, Tomohiro Suzuki, Hiroki Iwama, Motoko S. Asano, Akiharu Satake
Summary: We synthesized three new dyads composed of a Zn porphyrin and fac-Re(bpy)(CO)(3)Br units, and investigated their photophysical properties and catalytic activity in CO2 reduction. Among the three dyads, ZnP-5Bpy=Re-Br showed the highest durability and reaction efficiency, reaching a reaction quantum yield of 24%. The significant activity in ZnP-5Bpy=Re-Br is attributed to the absence of electron accumulation on the Zn porphyrin, facilitated by dual interactions of triethanolamine (TEOA) with the Re and Zn ions in the dyad. The catalytic activities and RTP properties are considered independent but greatly influenced by the connecting positions on the bpy ligand in ZnP-nBpy=Re-Br.
Article
Chemistry, Physical
Kurisingal B. Daisymol, Karical R. Gopidas
Summary: A long-standing challenge in photoinduced electron transfer research is addressed by designing donor-acceptor dyads with adamantane moiety as a bridge, resulting in microsecond lifetimes of charge-separated (CS) states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Wenhui Zhu, Yanran Wu, Yiyan Zhang, Andrey A. Sukhanov, Yuqi Chu, Xue Zhang, Jianzhang Zhao, Violeta K. Voronkova
Summary: We synthesized a rhodamine-TEMPO chromophore-radical dyad (RB-TEMPO) to investigate the radical enhanced intersystem crossing (REISC). The covalent connection between the visible light-harvesting chromophore rhodamine and the nitroxide radical TEMPO was established through a C-N bond. The fluorescence of the rhodamine moiety is effectively quenched in RB-TEMPO, attributed to the intramolecular electron spin-spin interaction between the nitroxide radical and the photoexcited rhodamine chromophore. Nanosecond transient absorption spectra confirmed the occurrence of REISC in RB-TEMPO, with the detection of the rhodamine chromophore triplet excited state. The application of RB-TEMPO as a photoinitiator for the photopolymerization of PETA was explored.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Jan Kozisek, Jan Svoboda, Jiri Zednik, Blanka Vlckova, Ivana Sloufova
Summary: Metal 2,2':6',2 ''-terpyridine (tpy) complexes are commonly used in metallo-supramolecular polymers due to their photophysical properties in solar energy applications. Resonance Raman (RR) excitation profiles can serve as sensitive indicators of the electronic properties of chromophores. In this study, RR spectra of iron (Fe(II)) complexes with 4'-substituted tpy ligands were compared to investigate changes in their electronic structure after functionalization, revealing unique enhancement properties of complex 4a at 633 nm excitation, indicating mixed metal/ligand character in its highest occupied molecular orbital. These findings suggest that complex 4a is a promising candidate for further exploration as a sensitizer for solar cells.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Multidisciplinary
Maryam Nazari Haghighi Pashaki, Tae-Kyu Choi, Egmont J. Rohwer, Thomas Feurer, Anne-Kathrin Duhme-Klair, Wojciech Gawelda, Andrea Cannizzo
Summary: Photo-induced oxidation-enhancement in biomimetic bridged Ru(ii)-Mo(vi) photo-catalyst is unexpectedly photo-activated in ps timescales, where one-photon absorption generates an excited state activating both photo-oxidized and photo-reduced catalytic centres independently.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Austin P. Lanquist, Eric J. Piechota, Lanka D. Wickramasinghe, Alexia Marques Silva, Randolph P. Thummel, Claudia Turro
Summary: Two new complexes, [Ru(tpy)(qdppz)](PF6)(2) and [Ru(qdppz)(2)](PF6)(2), were investigated for their potential use as phototherapeutic agents. They exhibit different photophysical properties compared to [Ru(tpy)(2)](2+), with distinct absorption and emission spectra.
INORGANIC CHEMISTRY
(2023)