与此相反,在高浓度乙酰丙酸的反应体系中,锆基催化剂失活明显。针对此问题,来自湖南师范大学的伏再辉等人制备出新型的锆基催化剂(GluPC-Zr)并成功的解决了高浓度下乙酰丙酸制备γ-戊内酯的难题(如Table 1 entry 10所示)。 图文解读 Fig. 1 FT-IR spectra (A), pyridine-adsorbed FT-IR spectra of GluPC-Z...
f, IR spectra before and after adsorption of pyridine at variable temperatures on LSP-Z100 and HZSM-5. The dashed lines indicate vibrational peaks of pyridine molecules adsorbed on Brönsted acid sites (1545 cm–1) and Lewis acid sites (1455 cm–1). g, IR spectra before and after ...
该研究为VBTL深蓝色素在‘Wu mi’中的消化抵抗来促进其作为一种健康谷物产品血糖调节作用提供了重要证据。 Fig. 1. (A) Absorbance curves of UV-vis spectra of the supernatants of different starch-pigment complexes. (B)b* values of different types of starch-pigment complexes. GRS: Glutinous rice st...
IR spectroscopic instruments can very quickly collect spectra either in single-element mode (1D) or in imaging mode (2D) using, e.g. a focal plane array (FPA) detector. Whereas the acquisition of 1D and 2D spectral information is straightforward in state-of-the-art IR microscopes, obtaining ...
It is possible that syntheses will occasionally produce a material that cannot be reliably analyzed, gives uninformative IR and electronic spectra, and presents no definitive NMR data because of paramagnetism or dynamic exchange processes. Cases of this sort may be acceptable if and only if the ...
Students look at a series of emission spectra and determine the identity of an unknown. They will also receive and analyze IR and mass spectroscopy data. Activity: Periodic Table Dry Lab Students graph values for atomic radius, electronegativity, and ionization energy to predict trends and explain...
The structure of Boerelasin B (molecular formula C29H35NO4) was determined from 1D and 2D NMR spectra as well as by comparison of the spectroscopic data with those of a known similar structure isolated from the same fungus. The NMR data obtained were used by us for challenging Structure Elu...
Chemistry Data Booklet:化学数据手册手册,化学,数据,Data,DATA,data,化学数据,化学手册,反馈意见 文档格式: .pdf 文档大小: 341.18K 文档页数: 24页 顶/踩数: 0/0 收藏人数: 3 评论次数: 0 文档热度: 文档分类: 论文--毕业论文 文档标签: 手册化学数据DataDATAdata化学数据化学手册反馈意见 ...
(JASCO Ltd., Tokyo, Japan). ECD spectra were acquired on a JASCO J-715 (JASCO) or Chirascan CD (Applied Photophysics) spectropolarimeter. IR spectra were obtained on a Nicolet Nexus 470 spectrophotometer (Perkin Elmer Ltd., Boston, MA, USA) in KBr discs. NMR spectra were recorded on a ...
The same method was applied to all of the donor–acceptor pairs, which required the measurement of the extinction-calibrated difference spectra for the oxidized and neutral forms of the individual donors, as well as for the native and reduced forms of the two metal complexes (Supplementary Section...