Article
Chemistry, Physical
Matthew Nava, Agnes E. Thorarinsdottir, Nazario Lopez, Christopher C. Cummins, Daniel G. Nocera
Summary: Understanding the redox reactions and processes in metal-air and specifically lithium-air batteries, especially the chemistry of peroxide dianion O22-, is crucial for the advancement of this promising energy-storage technology. The electron transfer kinetics and redox reaction chemistry of isolated peroxide dianion encapsulated within a hexacarboxamide cryptand are reviewed. Further research on the electron transfer properties and the chemical reactions of peroxide dianion will contribute to the development of rechargeable lithium-air batteries.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yanhua Jia, Qinglin Jiang, Bohan Wang, Jiaji Yang, Jiang Zhang, Yuguang Ma
Summary: The anion radical and dianion of perylene diimide derivatives (PDIs) have attracted attention for their unique physicochemical properties in organic semiconductors. However, the impact of packing structure and radical content on carrier transport in the solid state needs further investigation. In this study, bay-tetrachloro-substituted PDI (B-4Cl-PDI) anion radical and dianion films were quantitatively doped with N(2)H(4)·H(2)O. The X-ray powder diffraction patterns showed different structures for the anion radical and dianion aggregates, and the manipulation of radical content resulted in varying electrical conductivity values.
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
(2023)
Article
Chemistry, Multidisciplinary
Tsz-Kan Ma, Diyuan Li, Jonathan D. Wilden
Summary: Mechanistic studies of a reactive oxygen species mediated electrochemical radical reaction of alkyl iodides are described. Hydroxyl radicals and ozone are identified as the active species involved in the formation of alkyl radicals under mildly reducing potential (-1.0 V vs. Ag QRE) in buffered acidic conditions (pH 3.6).
CHEMICAL COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Aswin Kottapurath Vijay, Vered Marks, Amir Mizrahi, Yinghao Wen, Xingmao Ma, Virender K. Sharma, Dan Meyerstein
Summary: This study investigated the kinetics and mechanisms of the reactions between Feaq II and PMS or PDS at different pH values, as well as the influence of bicarbonate (HCO3-). The results showed that FeaqIV was the dominant oxidizing species in the absence of HCO3-. In the presence of environmentally relevant concentrations of HCO3-, carbonate radical anion (CO3 center dot-) became the dominant reactive species. These findings provide insights for advancing persulfate-based advanced oxidation processes (AOPs) in oxidizing pollutants in natural water.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhaowen Dong, Andrzej Sienkiewicz, Abdusalom A. Suleymanov, Cesare Berton, Farzaneh Fadaei-Tirani, Rosario Scopelliti, Kay Severin
Summary: This study describes a biselenolene ligand with unique electronic properties, exhibiting diamagnetic nature and redox activity, allowing for the isolation of stable radicals and unconventional coordination chemistry.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Wolfgang Einholz, Matthias Hofmann, Ronald Schaefer, Christoph Wieloch, Willi Keller, Markus Stroebele, Hans-Juergen Meyer
Summary: The article describes the synthesis, structure, spectroscopic data, and redox properties of B8Cl8 and its derivatives, as well as experimental and theoretical studies, revealing the fast fluctuation behavior of [B8Cl8](2-).
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Thomas Wiesner, Zhu Wu, Jie Han, Lei Ji, Alexandra Friedrich, Ivo Krummenacher, Michael Moos, Christoph Lambert, Holger Braunschweig, Benjamin Rudin, Hilmar Reiss, Olena Tverskoy, Frank Rominger, Andreas Dreuw, Todd B. Marder, Jan Freudenberg, Uwe H. F. Bunz
Summary: Tetraiodotetraazapentacene I(4)TAP, a new derivative in the series of halogenated silylated tetraazapentacenes, has been successfully synthesized and characterized by crystallography. Its air-stable monoanion and relatively air-stable dianion were obtained through reduction reactions and also confirmed by crystallography. Additionally, the structural and spectroscopic properties of I(4)TAP were compared to non-halogenated TAP and Br(4)TAP. It was found that I(4)TAP exhibits high electron mobility in thin-film transistors.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Aswin Kottapurath Vijay, Virender K. Sharma, Dan Meyerstein
Summary: Iron(II), Fe-II, plays a crucial role in various natural and biological reactions. Understanding the mechanism and rates of Fe-II oxidation by molecular oxygen (O-2) in the presence of bicarbonate (HCO3-) is essential due to its high concentration in environmental conditions. While previous studies suggested the formation of reactive oxygen species, this study demonstrates the rapid generation of carbonate radicals (CO3 center dot-) in Fe-II oxidation by O-2 in the presence of bicarbonate. The findings highlight the importance of considering CO3 center dot- formation in the geochemical cycling of iron and carbon.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Yanlin Shi, Chanaka J. Mudugamuwa, Thidas N. Abeysinghe, Yasser S. M. Alotaibi, Michael J. Monteiro, Justin M. Chalker, Jodie L. Lutkenhaus, Zhongfan Jia
Summary: This study highlights the importance of charge effects on the electrochemical behavior of water-soluble redox polymers, showing that charges dictate the diffusion coefficients and charge transfer kinetics of these materials at different pH levels. The results suggest that electrostatic interactions between charged segments can greatly enhance the electron self-exchange reaction rate in redox-induced polymer films.
Article
Chemistry, Multidisciplinary
Haiyan Cui, Liting Wang, Huapeng Ruan, Min Liu, Zhongtao Feng, Jie Wang, Yue Zhao, Xinping Wang
Summary: By using potassium to reduce 2,7-tBu(2)-pyrene-4,5,9,10-tetraone (1), researchers obtained two monoradicals 1K(cryp) and 1K(18c6), a radical tetramer [1K(15c5)](4), and a radical polymer (1K)(2n). The study demonstrated significant spin density modulation of an organic radical anion in solid state through electrostatic attraction, without altering the molecular skeletons.
CHEMICAL COMMUNICATIONS
(2021)
Article
Biochemical Research Methods
Muhammad Tariq, Safeer Jan, Sehrish Sarfaraz, Shabbir Muhammad, Khurshid Ayub
Summary: In this study, the hydrogen bonding phenomenon in alcohols-dinitrobenzene (DNB) systems was investigated using electrochemical and computational approaches. It was found that the hydrogen bonding interactions can be observed through cyclic voltammetry when alcohols are added. The strength of hydrogen bonding was evaluated qualitatively and quantitatively using theoretical calculations, which is important for understanding interactions in biological systems.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2023)
Article
Chemistry, Physical
Siuli Das, Rakesh Mondal, Gargi Chakraborty, Amit Kumar Guin, Abhishek Das, Nanda D. Paul
Summary: The study presented a ligand-centered redox-controlled approach using a Zn(II)-stabilized azo-anion radical complex as a catalyst for efficient dehydrogenation of various N-heterocycles. The catalyst was found to be compatible with the cascade synthesis of N-heterocycles through dehydrogenative coupling of alcohols with other suitable coupling partners. Mechanistic investigation revealed that the dehydrogenation reactions proceed via a one-electron hydrogen atom transfer pathway and involve exclusive involvement of ligand-centered redox events with zinc acting only as the template.
Article
Chemistry, Multidisciplinary
Abel Cardenas Valdivia, Yasi Dai, Filippo Rambaldi, Joshua E. Barker, Justin J. Dressler, Zheng Zhou, Yikun Zhu, Zheng Wei, Marina A. Petrukhina, Michael M. Haley, Fabrizia Negri, Juan Casado
Summary: The electronic, optical, and solid state properties of a series of monoradicals, anions, and cations obtained from starting neutral diradicals have been studied. The properties of the neutral state, specifically the diradical character, are related to the properties of the radical redox forms. The analysis of their optical features has been carried out using molecular orbital and valence bond theories, and electronic UV-Vis-NIR absorption, X-ray solid-state diffraction, and quantum chemical calculations have been conducted.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Kaiyun Ji, Jinpeng Shan, Xing Wang, Xiaoli Tan, Jingli Hou, Yangping Liu, Yuguang Song
Summary: This study introduces a novel strategy for designing near-infrared O2?- fluorescent probes with high self-stability and sensitivity to O2?-. The probes can image O2?- generation in various cells and show potential in drug toxicity evaluation.
FREE RADICAL BIOLOGY AND MEDICINE
(2021)
Article
Chemistry, Physical
Hye Won Jeong, Tamas Sandor Zsigmond, Gergely Ferenc Samu, Csaba Janaky
Summary: This study reveals the dual roles of TCNQ in photocatalytic and photoelectrochemical research, acting as an electron scavenger while also accelerating the decomposition of CsPbBr3 photoelectrodes. The proposed charge transfer and halide exchange pathways shed light on the instability of the films during PEC operation.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Abdul Jaleel Laghari, Umair Aftab, Aneela Tahira, Aqeel Ahmed Shah, Alessandro Gradone, Muhammad Yameen Solangi, Abdul Hanan Samo, Mukesh Kumar, Muhammad Ishaque Abro, Muhammad Wasim Akhtar, Raffaello Mazzaro, Vittorio Morandi, Amerah Mutlaq Alotaibi, Ayman Nafady, Antonia Infantes-Molina, Zafar Hussain Ibupoto
Summary: The Co3O4-MgO (CM) composite was synthesized by wet chemical method, which showed efficient oxygen evolution reaction (OER) due to the abundant oxygen vacancies and Co2+ concentration. Although MgO was inactive towards OER, it facilitated the formation of oxygen vacancies and Co2+ ions, accelerating OER kinetics. Physical studies and analytical techniques were used to investigate the morphology, crystalline structure, surface information, and chemical composition of the CM composite. The optimized CM-0.1 composite exhibited lower overpotential and higher electrochemical activity, indicating its enhanced OER performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Gulsum Ersu, Carmen Munuera, Federico J. Mompean, Daniel Vaquero, Jorge Quereda, Joao Elias F. S. Rodrigues, Jose A. Alonso, Eduardo Flores, Jose R. Ares, Isabel J. Ferrer, Abdullah M. Al-Enizi, Ayman Nafady, Sruthi Kuriakose, Joshua O. Island, Andres Castellanos-Gomez
Summary: We have developed a method to fabricate thermoelectric devices on office paper substrates using handcrafting techniques. The devices consist of thin films of WS2, Te, and BP (P-type semiconductors) and TiS3 and TiS2 (N-type semiconductors) deposited by rubbing these materials' powders onto the paper. The semiconducting films exhibit high Seebeck coefficients, reaching (+1.32 +/- 0.27) mV K-1 for WS2 and (-0.82 +/- 0.15) mV K-1 for TiS3. Peltier elements were also constructed by connecting the P- and N-type films with graphite electrodes, achieving a thermopower value of up to 6.11 mV K-1 when the Peltier element had three junctions. This work demonstrates the potential application of semiconducting van der Waals materials in thermoelectric power generation and low-cost disposable electronic devices.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Muhammad Ali Bhatti, Khalida Faryal Almani, Aqeel Ahmed Shah, Aneela Tahira, Iftikhar Ahmed Chana, Umair Aftab, Mazhar Hussain Ibupoto, Abdul Nabi Mirjat, Amal Aboelmaaref, Ayman Nafady, Brigitte Vigolo, Zafar Hussain Ibupoto
Summary: In this study, the role of natural dead sea sponge (DSS) as a host substrate for ZnO immobilization was investigated. The ZnO/DSS hybrid material exhibited excellent degradation efficiency for the removal of methylene blue (MB) dye. This was attributed to the 3D porous structure, high oxidation rate, and charge separation properties of ZnO/DSS.
Article
Chemistry, Physical
Abdul Jaleel Laghari, Umair Aftab, Aqeel Ahmed Shah, Muhammad Yameen Solangi, Muhammad Ishaque Abro, Sameerah I. Al-Saeedi, Noha Naeim, Ayman Nafady, Brigitte Vigolo, Melanie Emo, Antonia Infantes Molina, Aneela Tahira, Zafar Hussain Ibhupoto
Summary: In this study, a new strategy of using rotten apple juice as a source for surface modification of Co3O4 nanostructures has been developed, resulting in efficient electrocatalysts for the oxygen evolution reaction (OER) at low overpotential. The morphology, chemical composition, and crystalline aspects of the Co3O4 nanostructures were analyzed using different techniques. The Co3O4 nanostructures grown with rotten apple juice showed low impurity levels, surface modification, reduced particle size, high concentration of oxygen vacancies, defects, and cubic phase of Co3O4. The performance of the surface-modified Co3O4 nanostructures with apple juice as an electrocatalyst for OER was outstanding. The overall rating for this study is 8 out of 10.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Biochemistry & Molecular Biology
Amna Altaf, Manzar Sohail, Ayman Nafady, Rashid G. Siddique, Syed Shoaib Ahmad Shah, Tayyaba Najam
Summary: The depletion of fossil fuels and environmental pollution has driven scientists to develop renewable and green energy sources. Photocatalytic water splitting is an effective strategy for producing clean hydrogen fuel in the emerging hydrogen economy. In this study, the photocatalyst (PdO.TiO2) was introduced to accelerate the oxygen evolution reaction (OER) in a photoelectrochemical system. The catalyst demonstrated a significant increase in current density from 0.89 mA/cm2 (dark) to 4.27 mA/cm2 (light) during OER at an applied potential of 0.5 V. With a Tafel slope of 170 mVdec(-1) and an efficiency of 0.25% at 0.93 V, the synthesized PdO.TiO2 material showed promising photocatalytic activity, encouraging further exploration of related catalysts for facilitating OER.
Article
Materials Science, Multidisciplinary
Gulsum Ersu, Yigit Sozen, Estrella Sanchez-Viso, Sruthi Kuriakose, Beatriz H. Juarez, Federico J. Mompean, Mar Garcia-Hernandez, Lea Visscher, Alvaro J. Magdaleno, Ferry Prins, Abdullah M. Al-Enizi, Ayman Nafady, Carmen Munuera, Joshua O. Island, Andres Castellanos-Gomez
Summary: The use of low-cost benchtop plotters combined with refillable writing pens and markers has been studied as an effective method to print nanomaterial-based inks on paper substrates. The approach is robust and precise, allowing for the printing of various solution-processable nanomaterials with narrow pattern features. The study also illustrates the versatility of this printing platform by successfully printing a range of materials with different properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Analytical
Razium A. Soomro, Jai Kumar, Rana R. Neiber, Sirajuddin, Amerah M. Alotaibi, Shoyebmohamad F. Shaikh, Nazeer Ahmed, Ayman Nafady
Summary: A photo-active TiO2/Ti3C2Tx platform was constructed by partially oxidizing few-layered MXene (Ti3C2Tx), enabling selective detection of folate receptors (FR), particularly FR-expressing breast cancer cells (MDA-MB-231). The platform was adapted for biorecognition by conjugating chitosan and folic acid (FA) networks, allowing sensitive detection of FR-expressed cells.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Physical
Anbrah E. Alzubidi, Alan M. Bond, Lisandra L. Martin
Summary: Published data suggests that sparingly soluble metal complexes of TCNQF1-n, where n=0, 1, 2, 4, can act as heterogeneous catalysts for the slow [Fe(CN)6]3- =4- -S2O2-3/S4O2-6 reaction in water. However, this study shows that the coordination polymer CuTCNQF4 can participate as a homogeneous catalyst through a small concentration of dissolved TCNQF1-4. UV-visible spectrophotometry was used to study the catalysis of the redox reaction in the presence of various catalysts. The findings suggest the need to reevaluate the mechanism of catalysis by TCNQF4 based solids.
Article
Materials Science, Multidisciplinary
Mahmoud A. Hefnawy, Ayman Nafady, Shaaban K. Mohamed, Shymaa S. Medany
Summary: Taking advantage of multi-walled carbon nanotubes, metallic silver/carbon nanotube composite (Ag@CNT) was prepared using green tea extract to enhance hydrogen and oxygen evolution reactions. Various physicochemical methods were used to characterize the synthesized Ag@CNT composite. The electrochemical performance of the Ag@CNT electrocatalyst for hydrogen production was compared to pristine CNT and Ag. The results showed enhanced electrocatalysis for the designed composite.
Article
Chemistry, Analytical
Irum Naz, Aneela Tahira, Aqeel Ahmed Shah, Muhammad Ali Bhatti, Ihsan Ali Mahar, Mehnaz Parveen Markhand, Ghulam Murtaza Mastoi, Ayman Nafady, Shymaa S. Medany, Elmuez A. Dawi, Lama M. Saleem, Brigitte Vigolo, Zafar Hussain Ibupoto
Summary: To accurately determine urea in various samples, including clinical, food, dairy, and agricultural samples, a new analytical method is needed. Non-enzymatic methods are preferred due to their low cost and ease of use. In this study, bitter gourd peel waste was used to modify and transform nickel oxide nanostructures, resulting in a high sensitivity to urea oxidation under alkaline conditions.
Article
Green & Sustainable Science & Technology
Ragab Rabeiy, Saud Almutairi, Ahmed Birima, Lamyaa Kassem, Ayman Nafady
Summary: Solid waste management is highly considered in the Kingdom of Saudi Arabia for the protection of the environment, preserving resources, and producing energy. A study at Qassim University in Saudi Arabia evaluated the stakeholders' knowledge and practices related to solid waste separation, as well as the current collection system of solid waste on the university's campus. The results showed a high level of awareness among respondents, although waste separation at the generation point was poor. The study suggests the implementation of teaching courses, workshops, and advertisements to increase awareness of the benefits of waste separation at the source.
Article
Chemistry, Multidisciplinary
Cheng-Xia Chen, Hassan Rabaa, Haiping Wang, Pui Ching Lan, Yang-Yang Xiong, Zhang-Wen Wei, Abdullah M. Al-Enizi, Ayman Nafady, Shengqian Ma
Summary: We have developed a new metal-organic cage called TCPB-1, which can efficiently drive CO2 transformation by incorporating a Lewis acid functionalized linker. The addition of Lewis acidic boron sites enhances the stability and durability of the catalyst.
Article
Chemistry, Physical
Anbrah E. Alzubidi, Alan M. Bond, Lisandra L. Martin
Summary: Mechanistic variation in catalysis through substituent-based redox tuning is well established. Fluorination of TCNQ provides a significant variation in the redox potentials of the TCNQF(n)(0/1-) and TCNQF(n)(1/2-) processes. The catalysis of the ferrocyanide-thiosulfate redox reaction in aqueous solution occurs via different mechanisms depending on the presence of fluorinated or non-fluorinated catalysts. Thermodynamic data explain the observed differences in the catalytic mechanisms for the two systems. CuTCNQF(n) coordination polymers, previously considered as insoluble and heterogeneous catalysts, are shown to act as homogeneous catalysts in the ferricyanide-thiosulfate reaction.
Article
Materials Science, Biomaterials
Michelle D. Farrelly, Jiali Zhai, Alice Y. J. Tiong, Leonie van 't Hag, Heidi H. Yu, Jian Li, Lisandra L. Martin, San H. Thang
Summary: Synthentic polymer nanodiscs, formed by amphipathic copolymers, have been used as an analytical tool for solubilisation and structural study of membrane proteins in their natural lipid environment. In this study, a new class of amphipathic copolymer was tested for its ability to form nanodiscs, and the solubilisation efficiency, size, structure and shape of the nanodiscs were determined. The length of the hydrocarbon chain in the polymer significantly affected the solubilisation and the size of the nanodiscs. The selective interaction of the less hydrophobic polymers with bacterial membranes suggests potential applications in selective solubilisation, biosensing, and antimicrobial development.
BIOMATERIALS SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Feijie Li, Pauline Dhordain, Milton T. W. Hearn, Lisandra L. Martin, Louise E. Bennett
Summary: Mammalian milk proteins can release antimicrobial peptides (AMPs) with bioactivity in the gastrointestinal and cardiovascular systems. In this study, in silico methods were used to analyze the AMPs released from major proteins in human and cow milk under infant digestion conditions. The results showed that whey proteins in both human and cow milks had higher levels of hydrolysis compared to caseins. Cow milk had higher AMP yields than human milk, even after standardizing the ratio of whey to casein. Beta-lactoglobulin, unique to cow milk, released the highest yield of AMPs and may have an important biological function.
