A nanoencapsulation technique was applied to an oxygen-scavenging system, and thermal processing was investigated as an activator to trigger the oxygen-scavenging reaction. α-Tocopherol-loaded polycaprolactone (PCL) nanoparticles (NPs) were prepared using an oil-in-water emulsion solvent evaporation method. The influences of iron(II) chloride, water, and thermal processing on the oxygen-scavenging capability were investigated. NPs without iron(II) chloride, moisture, and thermal processing had no oxygen-scavenging effect. However, the oxygen content (%) in the cup headspace of 20.9% decreased to 20.4% when the oxygen-scavenging system contained NPs, water, and iron(II) chloride. The oxygen content (%) decreased further to 19.5% when water was eliminated from the mixture. In this research, NPs and iron(II) chloride with thermal processing had an oxygen-scavenging capacity of 6.44 cm3 of O2/g and an oxygen-scavenging rate of 0.21 cm3 of O2 g(-1) day(-1). Results indicated that NPs and iron(II) chloride in an oxygen-scavenging system can be used as a heat-activated oxygen scavenger.
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http://dx.doi.org/10.1021/jf103872g | DOI Listing |
Org Lett
January 2025
School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
Simple aryl chlorides represent challenging substrates in iron-catalyzed borylation. A combination of Li[B(Bu)pin-Bpin] as the borylating reagent and a catalyst formed in situ from iron(II) triflate and the commercially available N-heterocyclic carbene ligand, IMes, gives significantly improved activity and a much broader scope than previously reported iron-based catalysts. Iron triflate is also a good precatalyst for the borylation of aryl triflates─a previously unreported transformation─and in these cases the IMes ligand is not required.
View Article and Find Full Text PDFJ Inorg Biochem
January 2025
Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan. Electronic address:
J Am Chem Soc
September 2024
Chair of Solid-State and Quantum Chemistry, Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany.
Two novel ternary air-stable transition-metal carbodiimides, MnHf(NCN) and FeHf(NCN), were synthesized via solid-state metathesis using either ZnNCN or NaNCN as the carbodiimide source and the corresponding binary metal chlorides. These two phases are the first examples of transition-metal carbodiimides with an (NCN) composition, akin to ubiquitous O perovskite oxides. The crystal structure of MnHf(NCN) was determined and refined from powder X-ray diffraction (XRD) data in the non-centrosymmetric space group 622 allowing for chirality, the assignment of which is supported by second-harmonic generation (SHG) measurements.
View Article and Find Full Text PDFACS Omega
June 2024
Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague 8, The Czech Republic.
A simple and efficient procedure for synthesizing novel pincer-type tridentate N-heterocyclic carbene bisphenolate ligands is reported. The synthesis of pincer proligands with ,'-disubstituted imidazoline core, and , was carried out via triethylorthoformate-promoted cyclization of either ,'-bis(2-hydroxy-3,5-di--butylphenyl)cyclohexanediamine, , or ,'-bis(2-hydroxyphenyl)cyclohexanediamine, , in the presence of concentrated hydrochloric acid. Cyclic voltammograms of the ligands revealed ligand-centered redox activity, indicating the noninnocent nature of the ligands.
View Article and Find Full Text PDFAnal Sci
September 2024
Estuary Research Center, Shimane University, Matsue, Shimane, 690-8504, Japan.
In this study, we developed a simple method that enables iron(III) in environmental water to be directly determined via spectrophotometry. In water samples, iron(III) formed a yellowish complex with N-1-Naphthylethylenediamine dihydrochloride (NEDA) at pH 2.0-2.
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