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1,124 Matching Results
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Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH3SCH2OO Radical Between 314 and 433 K
Article describes how the intramolecular hydrogen-shift rate coefficient of the CH3SCH2O2 (methylthiomethylperoxy, MSP) radical, a product formed in the oxidation of dimethyl sulfide (DMS), was measured using a pulsed laser photolysis flow tube reactor coupled to a high-resolution time-of-flight chemical ionization mass spectrometer that measured the formation of the DMS degradation end product HOOCH2SCHO. Measurements performed over the temperature range of 314–433 K yielded a hydrogen-shift rate coefficient of k1(T) = (2.39 ± 0.7) × 109 exp(−(7278 ± 99)/T) s–1 Arrhenius expression and a value extrapolated to 298 K of 0.06 s–1.
Date:
March 2, 2023
Creator:
Assaf, Emmanuel; Finewax, Zachary; Marshall, Paul; Veres, Patrick R.; Neuman, Andrew & Burkholder, James B. (James Bart), 1954-
Object Type:
Article
System:
The UNT Digital Library
Tuning excited state electronic structure and charge transport in covalent organic frameworks for enhanced photocatalytic performance
Article describes how covalent organic frameworks (COFs) represent an emerging class of organic photocatalysts. The authors use reticular chemistry to construct a family of isoreticular crystalline hydrazide-based COF photocatalysts, with the optoelectronic properties and local pore characteristics of the COFs modulated using different linkers.
Date:
February 27, 2023
Creator:
Chen, Zhongshan; Wang, Jingyi; Hao, Mengjie; Xie, Yinghui; Liu, Xiaolu; Waterhouse, Geoffrey I. N. et al.
Object Type:
Article
System:
The UNT Digital Library
Spatially confined protein assembly in hierarchical mesoporous metal-organic framework
Article discusses how the immobilization of biomolecules into porous materials could lead to significantly enhanced performance in terms of stability towards harsh reaction conditions and easier separation for their reuse. To gain insights into the spatial arrangement of biomolecules within the nanopores, the authors used in situ small-angle neutron scattering (SANS) to probe deuterated green fluorescent protein (d-GFP) entrapped in a mesoporous MOF.
Date:
February 21, 2023
Creator:
Wang, Xiaoliang; He, Lilin; Sumner, Jacob; Qian, Shuo; Zhang, Qiu; O'Neill, Hugh et al.
Object Type:
Article
System:
The UNT Digital Library
A theoretical study of M–M′ polar-covalent bonding in heterobimetallic multinuclear organometallic complexes of monovalent group 11 metal centres
Article describes how complexes with closed-shell (d10–d10) interactions have been studied for their interesting luminescence properties in organic light-emitting diode (OLED) devices. The present computational study aims at understanding the chemical bonding/interactions in a series of molecules with unusually short metal–metal bond distances between monovalent coinage-metal (d10–d10) centres.
Date:
February 8, 2023
Creator:
Rabaâ, Hassan; Sundholm, Dage & Omary, Mohammad A.
Object Type:
Article
System:
The UNT Digital Library
Post-imprinting modification: electrochemical and scanning electrochemical microscopy studies of a semi-covalently surface imprinted polymer
Authors of the article describe a post-imprinting modification of the imprinted molecular cavities for electrochemical sensing of a target protein. These mesoporous cavities were modified with a ferrocene ‘electrochemical’ tracer for electrochemical transduction of the target protein recognition.
Date:
January 25, 2023
Creator:
Kalecki, Jakub; Cieplak, Maciej; Iskierko, Z.; Piechowska, Joanna; Nogala, Wojciech; D'Souza, Francis et al.
Object Type:
Article
System:
The UNT Digital Library
An investigation of steric influence on the reactivity of FeV(O)(OH) tautomers in stereospecific C–H hydroxylation
Article describes how two new tetradentate N4 ligands (LN4), LN4 = Me2,Me2PyzTACN (1-(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)-4,7-dimethyl-1,4,7-triazacyclononane) and Me2,MeImTACN (1-((1-methyl-1H-imidazol-1-yl)methyl)-4,7-dimethyl-1,4,7-triazacyclononane) have been synthesized and their corresponding Fe(II) complexes [FeII(Me2,Me2PyzTACN)(CF3SO3)2], 1Pz, and [FeII(Me2,MeImTACN)(CF3SO3)2], 1Im, have been prepared and characterized. Based on these labelling studies, the steric influence exerted by each of the ligands towards the relative reactivity of the oxo ligands of the corresponding pair of Fe(V)(O)(OH) tautomers can be derived.
Date:
January 5, 2023
Creator:
Mitra, Mainak; Brinkmeier, Alexander; Li, Yong; Borrell, Margarida; Call, Arnau; Fillol, Julio Lloret et al.
Object Type:
Article
System:
The UNT Digital Library
Modulating Uranium Extraction Performance of Multivariate Covalent Organic Frameworks through Donor–Acceptor Linkers and Amidoxime Nanotraps
Article presents a COF (covalent organic framework)-based adsorption-photocatalysis strategy for selective removal of uranyl from seawater in the absence of sacrificial reagents. This work shows that multivariate COF adsorption-photocatalysts can be rationally engineered to work efficiently and stably without sacrificial electron donors, thus opening the pathway for the economic and efficient extraction of uranium from the earth’s oceans.
Date:
January 4, 2023
Creator:
Hao, Mengjie; Xie, Yinghui; Liu, Xiaolu; Chen, Zhongshan; Yang, Hui; Waterhouse, Geoffrey I. N. et al.
Object Type:
Article
System:
The UNT Digital Library
A Europium-Based Optical Sensor for the Detection of Carbon Dioxide and Its Application for a Fermentation Reaction
Article discusses a new europium-based complex, K[Eu(hfa)4] with hfa = hexafluoroacetylacetonate is synthesized and its structure confirmed via X-ray crystallography. Based on the data collected, a highly stable, brightly red-emissive Eu(III) complex with the ability to differentiate concentrations of CO2 in solution is hereby developed and characterized with benefits for various CO2 sensing applications.
Date:
December 21, 2022
Creator:
Benton, Erin N.; Rajitha Perera, Nawagamu A. K.; Nesterov, Vladimir N.; Perera, Wijayantha; Omary, Mohammad A. & Marpu, Sreekar
Object Type:
Article
System:
The UNT Digital Library
Population-based analysis of POT1 variants in a cutaneous melanoma case–control cohort
Article describes how pathogenic germline variants in the protection of telomeres 1 gene (POT1) have been associated with predisposition to a range of tumor types, including melanoma, glioma, leukemia and cardiac angiosarcoma. The authors sequenced all coding exons of the POT1 gene in 2928 European-descent melanoma cases and 3298 controls, identifying 43 protein-changing genetic variants.
Date:
December 20, 2022
Creator:
Simonin-Wilmer, Irving; Ossio, Raul; Leddin, Emmett M.; Harland, Mark; Pooley, Karen A.; Martil de la Garza, Mauricio Gerardo et al.
Object Type:
Article
System:
The UNT Digital Library
The chemical coupling between moist CO oxidation and gas-phase potassium sulfation
Article discusses how the chemical coupling between moist CO oxidation and transformation of gaseous potassium salts (KCl or KOH) in the presence and absence of SO2 was investigated experimentally and through chemical kinetic modeling. Analysis of the calculations indicates that sulfation pathways in the model involving KOSO3 contribute to the overprediction, but both the thermodynamic properties and rate constants in the model involve significant uncertainties and more work is required to resolve the discrepancy.
Date:
December 15, 2022
Creator:
Chanpirak, Arphaphon; Hashemi, Hamid; Frandsen, Flemming; Wu, Hao; Glarborg, Peter & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Lignocellulosic-Based Activated Carbon-Loaded Silver Nanoparticles and Chitosan for Efficient Removal of Cadmium and Optimization Using Response Surface Methodology
Article expresses how the cadmium-contaminated water body is a worldwide concern for the environment and toxic to human beings and the removal of cadmium ions from drinking and groundwater sustainably and cost-effectively is important. The results showed that synthesized CS-KAC-Ag was a biocompatible and versatile porous filtering material for the decontamination of different toxic metal ions.
Date:
December 13, 2022
Creator:
Mandal, Sujata; Marpu, Sreekar; Omary, Mohammad A.; Dinulescu, Catalin C.; Prybutok, Victor R. & Shi, Sheldon
Object Type:
Article
System:
The UNT Digital Library
The Crucial Role of Solvation Forces in the Steric Stabilization of Nanoplatelets
Article says that the steric stability of inorganic colloidal particles in an apolar solvent is usually described in terms of the balance between three contributions: the van der Waals attraction, the free energy of mixing, and the ligand compression. The authors demonstrate that for sufficiently large nanoplatelets, solvation forces are proportional to the interacting facet area, and their strength is intrinsically tied to the softness of the ligand shell.
Date:
December 9, 2022
Creator:
Petersen, Nanning; Girard, Martin; Riedinger, Andreas & Valsson, Omar
Object Type:
Article
System:
The UNT Digital Library
An experimental and chemical kinetic modeling study of the role of potassium in the moist oxidation of CO
Article investigates the effect of KCl on moist CO oxidation in a laminar flow quartz reactor. Experiments were conducted in the absence of O2 (gasification), as well as under reducing and fuel-lean conditions, in the temperature range 873–1573 K, and the results were interpreted in terms of a chemical kinetic model.
Date:
December 9, 2022
Creator:
Chanpirak, Arphaphon; Wu, Hao; Glarborg, Peter & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Analyzing existing support structures for transfer students in Chemistry between the University of North Texas and Dallas College
Data management plan for a grant seeking to analyze existing support structures for transfer students in Chemistry between the University of North Texas and Dallas College.
Date:
2022-12-01/2023-11-30
Creator:
Atkinson, Molly B.
Object Type:
Text
System:
The UNT Digital Library
Three Component Cascade Reaction of Cyclohexanones, Aryl Amines, and Benzoylmethylene Malonates: Cooperative Enamine-Brønsted Acid Approach to Tetrahydroindoles
Article discusses how a three-component cascade reaction comprising cyclic ketones, arylamines, and benzoylmethylene malonates has been developed to access 4,5,6,7-tetrahydro-1H-indoles. Furthermore, the reaction was achieved through cooperative enamine-Brønsted catalysis in high yields with wide substrate scopes.
Date:
November 30, 2022
Creator:
Vasquez, Jose Cortes; Alharbi, Waad S.; Davis, Jacqkis; Moore, Alexia; Nesterov, Vladimir N.; Cundari, Thomas R., 1964- et al.
Object Type:
Article
System:
The UNT Digital Library
Reweighted Manifold Learning of Collective Variables from Enhanced Sampling Simulations
Article provides a general reweighting framework based on anisotropic diffusion maps for manifold learning that takes into account that the learning data set is sampled from a biased probability distribution. The authors show that their proposed framework can be used in many manifold learning techniques on data from both standard and enhanced sampling simulations.
Date:
November 11, 2022
Creator:
Rydzewski, Jakub; Chen, Ming; Ghosh, Tushar K. & Valsson, Omar
Object Type:
Article
System:
The UNT Digital Library
Effect of N-Methyl-pyrrolidone (NMP) on the Equilibrium Solubility of Meloxicam in Aqueous Media: Correlation, Dissolution Thermodynamics, and Preferential Solvation
Article describes a study of the drug Meloxicam in N-methyl-pyrrolidone (NMP)–aqueous mixtures at several temperatures to expand the solubility database about pharmaceutical compounds in aqueous–mixed solvents. Meloxicam is preferentially hydrated in water-rich mixtures but preferentially solvated by NMP in the composition interval of 0.16 < x1 < 1.00.
Date:
October 14, 2022
Creator:
Tinjacá, Darío; Martínez, Fleming; Almanza, Ovidio A.; Jouyban, Abolghasem & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Optical in-situ measurements and modeling of post-flame sulfation of NaOH(g) and NaCl(g)
Article describes post-flame sulfation of gaseous sodium hydroxide (NaOH) and sodium chloride (NaCl) was investigated with optical in situ measurements at 850 to 1475°C. The combined experimental data, chemical equilibrium calculations and kinetic modeling of the present study support that sulfation of alkali species can occur in the gas phase through homogeneous reactions.
Date:
October 13, 2022
Creator:
Schmid, Daniel; Weng, Wubin; Li, Shen; Karlström, Oskar; Hupa, Mikko; Li, Zhongshan et al.
Object Type:
Article
System:
The UNT Digital Library
A covalently linked nickel(II) porphyrin–ruthenium(II) tris(bipyridyl) dyad for efficient photocatalytic water oxidation
Article describes how photocatalytic water splitting into H2 and O2 has attracted significant scientific interest for solar energy conversion applications during the last two decades. Authors of the article further elaborate that One of the half-reactions of this process, water oxidation, is known to be the key step in natural and artificial photosynthesis to convert and store solar energy.
Date:
October 5, 2022
Creator:
Nikoloudakis, Emmanouil; Alsaleh, Ajyal Z.; Charalambidis, Georgios; Coutsolelos, Athanassios G. & D'Souza, Francis
Object Type:
Article
System:
The UNT Digital Library
Corrosion Inhibition Effect of Pyridine-2-Thiol for Brass in An Acidic Environment
Article states that the inhibitive performance of pyridine-2-thiol added to a corrosive solution was investigated for brass using potentiodynamic polarization, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. Scanning electron microscopy showed defect free and less scale formation for the inhibited surface but the bare brass surface had larger amounts of scale formation. X-ray photoelectron spectroscopy and UV-vis spectroscopy was used to investigate surface chemical composition and inhibitor structural changes over time.
Date:
October 3, 2022
Creator:
Karunarathne, Darshan Jayasinghe; Aminifazl, Alireza; Abel, Tori E.; Quepons, Karen L. & Golden, Teresa Diane, 1963-
Object Type:
Article
System:
The UNT Digital Library
Metal-organic framework nanocrystal-derived hollow porousmaterials: Synthetic strategies and emerging applications
Article discusses how the fascinating, functional properties and applications of MOF-derived hollow porous materials primarily lie in their chemical composition, hollow character, and unique porous structure. The authors discuss a comprehensive overview of the synthetic strategies and emerging applications of hollow porous materials derived from MOF-based templates and/or precursors.
Date:
September 13, 2022
Creator:
Lui, Xiaolu; Verma, Guarav; Chen, Zhongshan; Hu, Baowei; Huang, Qifei; Yang, Hui et al.
Object Type:
Article
System:
The UNT Digital Library
Stereochemical and Biosynthetic Rationalisation of the Tropolone Sesquiterpenoids
Article summarises the known structures, biological activities, and biosynthetic pathways of the tropolone sesquiterpenoid family of fungal secondary metabolites. Synthesis of this knowledge allows likely structural and stereochemical misassignments to be revised and shows how the compounds can be divided into three main biosynthetic classes based on the stereochemistry of key biosynthetic steps.
Date:
August 31, 2022
Creator:
Li, Lei & Cox, Russell, J.
Object Type:
Article
System:
The UNT Digital Library
Increasing the Equilibrium Solubility of Meloxicam in Aqueous Media by Using Dimethyl Sulfoxide as a Cosolvent: Correlation, Dissolution Thermodynamics and Preferential Solvation
This article studies the solubility of meloxicam in dimethyl sulfoxide (DMSO)-aqueous solvent systems at several temperatures from 273.15 to 313.15 K to expand the solubility database about analgesic drugs in mixed solvents.
Date:
August 12, 2022
Creator:
Tinjacá, Darío; Martínez, Fleming; Almanza, Ovidio A.; Peña, María Á.; Jouyban, Abolghasem & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Expanding the Equilibrium Solubility and Dissolution Thermodynamics of Benzoic Acid in Aqueous Alcoholic Mixtures
This article determines the equilibrium solubility of benzoic acid in water and ethanol, as well as in nine {ethanol (1) + water (2)} mixtures from T = (293.15 to 323.15) K. The thermodynamic results presented could be useful in optimizing different physical and chemical processes involving benzoic acid in mixed aqueous-ethanol media.
Date:
August 1, 2022
Creator:
Akay, Sema; Kayan, Berkant; Peña, M. Ángeles; Jouyban, Abolghasem; Martínez, Fleming & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library