3.11.3.2 13C MAS NMR Spectrum Solid-state carbon NMR spectroscopy was performed on a Bruker ASX 400 spectrometer with a 100.623 MHz resonance frequency. For all solid-state spectra, MAS was applied at a frequency of 4000 Hz in a 7-mm rotor and direct excitation of 13C nuclei was induced...
Fig. 16. 13C CP-MAS NMR spectrum (226 MHz) of Tolterodine tartrate. Unlabeled minor signals correspond to the spinning bands caused by the chemical shift anisotropy. Experimental parameters of the spectrum: high-speed thick-walled ZrO2 rotors, 4 mm HCN MAS probe, MAS 18.5 kHz, recycling dela...
The CP-MAS 13C NMR spectrum for diphenyhydramine HCl is unusually simplified due to the pseudo-mirror symmetry of the structure. Internally diastereotopic pairs of nuclei, e.g.(CH3)2N, the two ipso-carbons, etc. appear to be pseudo-enantiotopic due to negligible differences in chemical ...
本文通过建立油浴快速加热模型,采用 13C CP/MAS NMR 技术,研究微波加热对马铃薯淀粉的双螺旋结构、单螺旋结构、无定形态含量的影响。结果表明:微波加热不会改变马铃薯淀粉中无定形态、双螺旋结构含量的变化趋势。微波的特殊效应会影响马铃薯淀粉有序结构的含量。关键词:食品加工技术;微波加热;马铃薯淀粉;NMR;有序结构...
产品名称:马来酸 CAS:110-16-7 分子式:C4H4O4 分子量:116.07 InChI:InChI=1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1- InChIKey:VZCYOOQTPOCHFL-UPHRSURJSA-N Smiles:C(O)(=O)/C=C\C(O)=O MS 1HNMR 13CNMR ...
ChemicalBook Provide Cholesterol(57-88-5) 13C NMR,IR2,MS,IR3,IR,1H NMR,Raman,ESR,13C NMR,Spectrum
5)solid-state resolution NMR spectrum固体高分辨核磁共振谱 6)~(13)C NMR核磁共振碳谱 1.NEURAL NETWORK APPLIED TO THE STUDY OF CHEMICAL SHIFT OF ~(13)C NMR SPECTROSCOPY IN ALKANES WITH A NOVEL MOLECULAR DISTANCEEDGE VECTOR (λ);神经网络用于核磁共振碳谱的研究:烷烃的化学位移和CSS与分子距边矢量λ...
1. Complete assignment of the CP/MAS (13)C NMR spectrum of the native cellulose. The precise assignments of cross polarization/magic angle spinning (CP/MAS) (13)C NMR spectra of cellulose I(alpha) and I(beta) were performed by using (13)C labeled cellulose biosynthesized by Acetobacter ...
MAS NMR spectra of piperidinium p-chlorobenzoate (C5H10NH(_{2}{^{+}}cdot )ClC6H4COO) upon deuterium substitution of hydrogen atoms which form two kinds of N-HO H-bonds in the crystal; in contrast to these spectra, only slight chemical shifts were recorded in 13C CP/MAS NMR ...
分子量:206.28 InChI:InChI=1S/C13H18O2/c1-9(2)8-11-4-6-12(7-5-11)10(3)13(14)15/h4-7,9-10H,8H2,1-3H3,(H,14,15) InChIKey:HEFNNWSXXWATRW-UHFFFAOYSA-N Smiles:C1(C=CC(CC(C)C)=CC=1)C(C)C(=O)O MS 1HNMR 13CNMR ...