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Hydrogen-Bonded Di(hydroperoxy)alkane Adducts of the Type CyP=O·(HOO)CHR (R = Alkyl).
Molecules
January 2025
Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
Five representatives of a novel type of di(hydroperoxy)alkane adducts of phosphine oxides have been synthesized and fully characterized, including their solubility in organic solvents. The phosphine oxide CyPO () has been used in combination with the corresponding aldehydes to create the adducts CyPO·(HOO)CHCH (), CyPO·(HOO)CHCHCH (), CyPO·(HOO)CH(CH)CH (), CyPO·(HOO)CH(CH)CH (), and CyPO·(HOO)CH(CH)CH (). All adducts crystallize easily and contain the peroxide and phosphine oxide hydrogen-bonded in 1:1 ratios.
View Article and Find Full Text PDFHydrolysis Reactions of p-Nitrophenyl Trifluoroacetate and S-Ethyl Trifluorothioacetate.
Molecules
January 2025
Department of Chemistry and Biochemistry, University of North Florida, Jacksonville, FL 32224, USA.
The formation of water structures can provide significant benefits in organic reactions, stabilizing charge and lowering activation energies. Hydrolysis reactions will frequently rely on water networks to accomplish these goals. Here, we used computational chemistry and experimental kinetics to investigate a model thioester molecule S-ethyl trifluorothioacetate, and extended work on a previously characterized ester p-nitrophenyl trifluoroacetate.
View Article and Find Full Text PDFA Study on the Impact of Temperature on the Anchoring Durability of Carbon-Fiber-Reinforced Polymer Cables.
Materials (Basel)
January 2025
School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China.
To improve the application of carbon-fiber-reinforced polymers (CFRPs) in civil engineering, the long-term durability of CFRP anchorage systems has become a critical issue. Temperature fluctuations can significantly impact the bond performance between CFRPs and the load transfer medium (LTM), making it essential to understand the effects of temperature on the durability of CFRP anchorages. Therefore, this study investigates the influence of temperature on the durability of CFRP anchorages through aging tests on 30 epoxy-filled CFRP-bonded anchorage specimens, followed by pull-out tests.
View Article and Find Full Text PDFThe Influence of Fiber Dispersion on the Properties of MgO Concrete and Engineering Applications.
Materials (Basel)
January 2025
School of Civil Engineering, Nantong Institute of Technology, Nantong 226000, China.
Adding expansion agents to compensate for concrete shrinkage is a common crack resistance technique, but excessive expansion can also increase the porosity of concrete and reduce its strength. The addition of fibers can reduce expansion and improve the compactness of concrete. However, too little fiber will not be effective in inhibition, while too much fiber will cause aggregation.
View Article and Find Full Text PDFHole Transfer and the Resulting DNA Damage.
Biomolecules
December 2024
Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, 84084 Fisciano, Italy.
In this review, we focus on the one-electron oxidation of DNA, which is a multipart event controlled by several competing factors. We will discuss the oxidation free energies of the four nucleobases and the electron detachment from DNA, influenced by specific interactions like hydrogen bonding and stacking interactions with neighboring sites in the double strand. The formation of a radical cation (hole) which can migrate through DNA (hole transport), depending on the sequence-specific effects and the allocation of the final oxidative damage, is also addressed.
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