Vibrationally Resolved LIF Spectrum of Tertiary Methylcyclohexoxy Radical

Cyclohexoxy radical and its substitutes are intermediates of the combustion reaction in automobile engines, and hence play an important role in the atmospheric chemistry. Spectroscopic and conformational studies can provide convenient methods to monitor these species. In this work, we report the observation of the laser induced fluorescence (LIF) excitation spectrum of 1-methylcyclohexoxy, a tertiary ring alkoxy radical, in supersonic jet condition. The spectrum was assigned preliminarily to the chair-axial and chair-equatorial conformers of 1-methylcyclohexoxy. No C–O stretch progression was observed in 1-methylcyclohexoxy spectrum, which was different from <i>t</i>-butoxy. The short lifetime of excited state 1-methylcyclohexoxy and increased C–O bond length suggested a less stable excited state induced by the increased steric repulsion via methyl substitution on the alkoxy carbon. Dissociation rather than H transfer was suggested as the major nonradiative relaxation process, which competed with the fluorescence path

Additional file 1: of Handgrip strength is positively related to blood pressure and hypertension risk: results from the National Health and nutrition examination survey

Table S1. Association between handgrip strength and SBP adjusted for age and BMI stratified by gender. Table S2. Association between handgrip strength and DBP stratified by gender. (DOCX 15 kb

Efficient Removal of Copper(II) and Malachite Green from Aqueous Solution by Magnetic Magnesium Silicate Composite

The magnetic magnesium silicate composite (Fe₃O₄@MgSi) with efficient removal of Cu­(II) and malachite green (MG) from aqueous solution were synthesized by hydrothermal approach. The synthetic flower-like particle size was about 2–3 μm. In the process of exploring the adsorption conditions, the isotherms were found to be well-fitted by Langmuir, Freundlich, and isotherm kinetics in accord with the pseudo-second-order model. In addition, the maximum adsorption capacity was 2198 mg·g^–1 when the Cu­(II) concentration of 800 mg·L^–1. These results indicated that Fe₃O₄@MgSi can be used as a superadsorbent and recyclable adsorbent to effectively and rapidly remove Cu­(II) and MG pollutants from industrial wastewater or drinking water