共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
5.
6.
7.
对(4R-cis)-6-[2-[2-(4-氟苯基)-5-(1-异丙基)-3-苯基-4-[苯胺(羰基)]-^1H-吡咯-1-基]乙基]-2,2-二甲基-1,3-二氧己环-4-乙酸叔丁酯的傅里叶变换离子回旋共振质谱(FT-ICR-MS)、核磁共振氢谱(^1H-NMR)、碳谱(^13C-NMR)以及^1H同核位移相关谱(^1H-^1HCOSY)、检出^1H的异核多量子相干谱(HMQC)和^1H检测的异核多键相关谱(HMBC)报道并进行解析。确定了^1H谱、^13C谱中各谱峰的归属,研究了其六元环部分的立体构象,并就空间效应对其化学位移的影响做了初步的探讨。 相似文献
8.
基于香豆素和苯并吡啶基团,构建了用于二氧化硫(SO_(2))高效检测的荧光探针P1,其化学结构通过核磁氢谱(^(1)H NMR)、碳谱(^(13)C NMR)和高分辨质谱(HR-MS)确证。在缓冲溶液体系中,单独的探针P1具有微弱的荧光,识别SO_(2)后荧光发射强度明显增强,能够实现对SO_(2)的专一性裸眼识别,检出限为126 nmol/L。生物应用实验结果表明,该探针具有较低的细胞毒性,可用于生物活细胞中外源性SO_(2)的荧光成像。 相似文献
9.
10.
11.
报道了盐酸莫西沙星的元素分析、红外光谱(IR) 、紫外光谱(UV) 、质谱(MS) 、氢-氢相关谱(1H-1HCOSY) 、碳谱(DEPT-45、DEPT-90、DEPT-135) 、多键碳氢相关谱(HMBC)等波谱数据,并对特征数据进行了化合物的结构解析。对所有的1H-NMR、13C-NMR谱的信号进行了归属。 相似文献
12.
杨明生 《分析测试技术与仪器》1995,1(4):52-54
对于80MHZ的核磁共振仪,^13C与^27Al的共振频率差为0.738MHZ。由于^13C核磁共振谱测定时需要较宽的频带,选择合适的参数,用^13C10nm单探头或613C-^1H5mm双探头都可以测得^27Al核磁共振谱。当Al^3+=0.1mol/L时,对于^13C10mm探头灵敏度为42,线宽4。8HZ;对^13C-H5mm双探头,灵敏度为24.8,线宽为3.2HZ。 相似文献
13.
Abraham A Prins R van Bokhoven JA van Eck ER Kentgens AP 《The journal of physical chemistry. B》2006,110(13):6553-6560
A combination of 27Al magic-angle spinning (MAS)/multiple quantum (MQ)-MAS, 13C-1H CPMAS, and 13C-{27Al} transfer of population in double-resonance (TRAPDOR) nuclear magnetic resonance (NMR) were used for the structural elucidation of the aluminum alkoxides aluminum ethoxide, aluminum isopropoxide, and aluminum tertiarybutoxide. Aluminum alkoxides exist as oligomers with aluminum in different coordinations. High-resolution 27Al MAS NMR experiments with high-spinning speed distinguished the aluminum atoms in different environments. The 27Al MAS NMR spectrum gave well-resolved powder patterns with different coordinations. Z-filter MQ-MAS was performed to obtain the number and types of aluminum environments in the oligomeric structure. 13C-1H CPMAS chemical shifts resolved the different carbon species (-CH3, =CH2, =CH-, and =C=) in the structures. 13C-{27Al} TRAPDOR experiments were employed to obtain relative Al-C dipolar interactions and to distinguish between terminal and bridging alkoxides in the crystallographic structures. The complete characterization of selected aluminum alkoxides using advanced NMR methods has evidenced the tetrameric structure for aluminum isopropoxide and the dimeric structure for aluminum tertiary-butoxide, as reported in the literature, and proposed a polymeric structure for aluminum ethoxide. 相似文献
14.
15.
A.N. Nesmeyanov G.B. Shulpin L.A. Fedorov P.V. Petrovsky M.I. Rybinskaya 《Journal of organometallic chemistry》1974,69(3):429-435
The 13C-{1H} and 1H NMR spectra of ferrocenyl chalkones (β-benzoylvinylferrocene add cinnamoylferrocene) and their iron carbonyl complexes were recorded. Splitting of the resonances of both α- and β-substituted cyclopentadienyl ring atoms was found in 13C-{1H} NMR spectra of all complexes. In 1H NMR spectra splitting of the resonances of the substituted cyclopentadienyl ring α-protons was detected only in the case of (cinnamoylferrocene)iron tricarbonyl. The splitting effect mentioned can be due to thesochsochronism (magnetic nonequivalence) of all carbon and hydrogen nuclei because of the iron carbonyl fragment coordination oauses the substituent to become the chiral group. The coordination of iron carbonyl group results in a reduction of the conjugation in the α,β-unsaturated ketone system. This phenomenon is discussed on the basis of 13C-{1H} and 1H NMR data. 相似文献
16.
To clarify the origin of amide-nitrogen of vitamin B12, [1-13C]aminolevulinic acid (ALA) and L-[amide-15N]glutamine were administered to P. shermanii. The 13C-nuclear magnetic resonance spectrum of the vitamin B12 subsequently isolated showed distinct 13C-15N coupling and isotope shift at six amide carbons. However, the C-57 amide carbon showed neither coupling, nor shift. Thus, it was concluded that the nitrogens of 6 amides of the side chain were derived from glutamine and the C-57 amide nitrogen was from threonine. 相似文献
17.
18.