邻苯二酚紫催化光度法测定亚硝酸根的研究

基于亚硝酸根对溴酸钾氧化邻苯二酚紫使其褪色的催化作用,建立了一种测定痕量亚硝酸根的新方法,研究了其动力学条件,测定了反应级数和表观活化能。测定范围为０．２～３．５μｇ／１０ｍＬ。方法选择性好,迅速简便,用于水中和蔬菜中亚硝酸根的测定,结果满意     

对苯二酚型蛇笼氧化还原树脂结构的设想与论证

根据模板聚合理论与对苯二酚型蛇笼氧化还原树脂的性能实验结果,设想本树脂具有蛇笼氧化还原结构,被吸留于其中的对苯二酚-甲醛线形树脂是能起氧化还原作用的“蛇”,交联基体树脂是“笼”。通过电镜实验及该树脂中的对苯二酚-甲醛线形树脂的抽提实验和红外光谱与氮元素定量分析实验,论证了我们所设想的结构模式。     

A method for the analysis of intermediates of oxidative hair dyes in cosmetic products

A method has been developed and validated for the analysis of some commonly used intermediates of oxidative hair dyes: phenylenediamines, toluenediamines, aminophenols, 1-Naphthol, resorcinol, and hydroquinone. The target analytes are ion-paired prior to HPLC analysis with gradient elution employing phosphate buffer-acetonitrile as mobile phase and detection in the wavelength range 220–400 nm by a photodiode array detector. A spectral-library, consisting of 220–400 nm spectra of the target substances and their HPLC retention times, has been prepared for the identification. A method of sample preparation was established and applied to the analysis of a series of cosmetic formulations for hair dyeing. The method has been found to be suitable for routine analysis of the target intermediates of oxidative hair dyes, and it may also be suitable for the analysis of some non-target intermediates of these substances.     

Synergetic Coupling of Redox-Active Sites on Organic Electrode Material for Robust and High-Performance Sodium-Ion Storage

Organic electrode materials (OEMs), valued for their sustainability and structural tunability, have been attracting increasing attention for wide application in sodium-ion batteries (SIBs) and other rechargeable batteries. However, most OEMs are plagued with insufficient specific capacity or poor cycling stability. Therefore, it′s imperative to enhance their specific capacity and cycling stability through molecular design. Herein, we designed and synthesized a heteroaromatic molecule 2,3,8,9,14,15-hexanol hexaazatrinaphthalene (HATN-6OH) by the synergetic coupling of catechol (the precursor of ortho-quinone)/ortho-quinone functional groups and HATN conjugated core structures. The abundance of catechol/ortho-quinone and imine redox-active moieties delivers a high specific capacity of nine-electron transfer for SIBs. Most notably, the π–π interactions and intermolecular hydrogen bond forces among HATN-6OH molecules secure the stable long-term cycling performance of SIBs. Consequently, the as-prepared HATN-6OH electrode exhibited a high specific capacity (554 mAh g⁻¹ at 0.1 A g⁻¹), excellent rate capability (202 mAh g⁻¹ at 10 A g⁻¹), and stable long-term cycling performance (73 % after 3000 cycles at 10 A g⁻¹) in SIBs. Additionally, the nine-electron transfer mechanism is confirmed by systematic density functional theory (DFT) calculation, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and Raman analysis. The achievement of the synergetic coupling of the redox-active sites on OEMs could be an important key to the enhancement of SIBs and other metal-ion batteries.