We report the visible absorption spectrum of the fluoroformyloxyl radical. The spectrum is assigned to the B 2A1–X 2B2 transition in FC(O)O. The origin of the excitation spectrum is observed at 13 150 cm−1 (760 nm). Extensive progressions in the OCO bending mode of the B state, ν′3 = 610 cm−1, dominate the spectrum. Three other progressions are observed: the OCO wag mode, ν′6 = 840 cm−1; the CF stretching mode, ν′2 = 1110 cm−1; and the asymmetric CO stretching mode, ν′4 = 2820 cm−1. Two series of hot bands also appear in the spectrum. From these bands the frequency of the OCO bending mode, ν″3 = 520 cm−1, is assigned for ground state FC(O)O. The experimental spectrum is compared to the results of ab initio MO calculations. These include second-order Mo/ller–Plesset perturbation theory (UMP2) and quadratic configuration interactions theory with single and double excitations (QCISD) for both the X 2B2 and B 2A1 states. The origin of the B 2A1–X 2B2 transition and the predicted vibrational frequencies are found to be in reasonable agreement with experiment.
Water-based or waterborne polyurethane matting resins find extensive application in surface coating to diminish gloss, offering a pleasant tactile experience and a matte aesthetic. This review represents the inaugural effort to consolidate the recent advancements in waterborne polyurethane matting resins, encompassing both physical and chemical matting types. The exploration commences with an introduction to a range of innovative matting agents tailored for the formulation of physical matting waterborne polyurethane resins. Subsequently, a thorough analysis and discussion unfold, delving into the synthesis, characterization, and matting mechanisms of chemical matting waterborne polyurethane resins. This comprehensive discussion draws upon a decade of dedicated research work by our group, contributing fresh perspectives to the evolution of chemical matting techniques. In conclusion, the review not only addresses the current state but also outlines potential challenges and future trends. This forward-looking perspective is intended to offer guidance for the design and synthesis of innovative waterborne polyurethane matting resins.
Motivation: The hepatic iron deposition in Type 2 Diabetes Mellitus (T2DM) patients could affect insulin resistance and glucose production. The R2*-based method for measuring iron content can be affected by factors like fat tissue and background magnetic fields. Goal(s): the study employed QSM method, which is insensitivity to the above confounder, to evaluate glucose dysfunction in T2DM. Approach: Hepatic R2* and QSM values were measured in 11 T2DM patients, and were correlated with glucose tolerance. Results: A negative correlation between QSM values and the insulin β-cells dysfunction was found, whereas R2* values did not show any significant correlation. Impact: Hepatic Quantitative Susceptibility Mapping may serve as a predictor of glucose metabolism dysfunction in patients with Type 2 Diabetes Mellitus and has shown to be more effective than hepatic R2* for this purpose.
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