甲酸/硫酸 (HCOOH/H2SO4)、N,N-二甲基甲酰胺(DMF)/N2O4、三氟乙酸(CF3COOH)/CH2Cl2 等也属 于衍生化溶剂。由于衍生化溶剂在溶解过程中会发生副反应,形成的结构不明确,不可 重复性是这类溶剂的最大弊端。例如,Golova 等[28]认为在 DMF/N2O4 溶解纤维素过程中, 纤维素和 N2O4 形成一种复杂的非极化质子...
Compound 9 was obtained as an amorphous solid and shown to have the molecular formula C49H78O19 based on HRESIMS (m/z: 993.5050 [M + Na]+, calcd. 993.5035) and 13C-NMR spectral data. The deduced molecular formula of 9 was higher than that of 6 by C6H10O4, and the 1H-NMR ...
Structure of molecules. Sulfuric acid molecule - chemical structural formula and model 2d and 3d vector on light background. H2SO4,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里
The mass spectrum of compound1suggested a structure closely related to isophorone, with a base peak occurring atm/z83 and a putative M+ion atm/z154, indicating a C9H14O2molecular formula (Fig.3, MS1). IR spectrum for this compound contained a C=O stretching band at 1722 cm−1and three...
Determination and modeling of the solubilities of NH4Al(SO4)2·12H2O in the NH4+-Al3+-H3O+-HSO4−-SO42−-H2O system at different H2SO4 molalities and t... Solubilities of NH4Al(SO4)2·12H2O in the NH4+-Al3+-H3O+-HSO4−-SO42−-H2O system, as well as the densities of th...
Table 1 Structure (chemical formula), molecular weight, and maximum absorbance wavelength of MG dye Full size table 3Results and discussion 3.1XRD analysis The XRD patterns of the Mn-Mg-Li ferrite samples presented in Fig.1are all consistent with cubic-structure single-phase spinels, with space...
supported through FE-SEM images. Using Scherrer formula, the calculated crystallite size of the bare ZnO is around 19 nm (TableS3, SI); which also reveals the crystalline nature of the sample. Figure 2 XRD diffractograms of (a) bare ZnO NRs and (ZnO NRs)1−x(CNs)xNCs with varying ...
Four new hybrid inorganic–organic salts of 1,4-diazabicyclo[2.2.2]octane N,N'-dioxide (odabco) with the formulae odabco·2HNO3 (1), odabco·HClO4 (2), odabco·H2SO4 (3) and odabco·2H2SO4 (4) were synthesized and characterized by single-crystal x-ray diffraction (XRD), ...
Briefly, samples (~300 mg) were hydrolyzed with 72% H2SO4 for 1 h at 30 °C followed by high temperature hydrolysis at 121 °C for 1 h after dilution to 4% H2SO4. After hydrolysis, the samples were diluted and quantified with High Performance Anion Exchange Chromatography with Pulsed-...
The solid residue is acidified with 30 mL 3M sulfuric acid and extracted with 3–15 mL portions of Et2O. The organic layers were combined, washed with deionized water, and the organic layer dried over Na2SO4. The solvent was evaporated under reduced pressure, providing a orange solid, which...