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cotton效应
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  cotton effect
     Finally, according to the negative Cotton effect of n→π CD band of α,β-unsaturated δ-lactone in 252 nm, the absolute configuration was assigned.
     进一步由α、β-不饱和δ内酯在圆二色散中n→π~*区Cotton效应推出了3的绝对构型。
短句来源
     Furthermore Cotton effect and Cotton split of CD spectra of these chiral compounds were explained by the exciton interaction theory.
     另外,用激子偶合理论解释了此类手性化合物圆二色谱的Cotton效应和Cotton分裂.
短句来源
     This paper reports the CD and UV spectra of the β- cdx inclusions of α- naphthylamine, β- naphthylamine, α- naphthylacetic acid and according to KAJTAR sector rule the Cotton effect and g factor give the orientation of guest molecules in β- cdx, correlates the CD spectra the orientation of guest molecules in β- cdx and the quantum calculating for the electric moment of transition.
     本文报道了β-环糊精分别包结α-萘胺、β-萘胺、α-萘乙酸的圆二色谱及紫外吸收光谱,并利用KAJTAR扇形规则,根据所测得的Cotton效应符号和各向异性因子确定了客体分子在环糊精空腔中的取向。
短句来源
     Studied the influence of temperature, pH, Ca2+, boron and congo red on circular dichroism of konjac glucomannan,the results showed that it brought a new cotton effect when in high pH, the rest mainly brought out the changes on absorptionintensity in different extent.
     研究了温度、pH、钙离子、硼和刚果红等对魔芋葡甘聚糖溶液园二色性的影响,结果显示在高pH条件下产生新的cotton效应,其余均表现为不同程度吸收强度的变化。
短句来源
     When chloroform was used as solvent and the concentration was 65wt%,the handedness of the two helicoidal structures was left handed (positive Cotton effect),but when dioxane or THF was used with the same concentration,a reversed handedness was observed.
     以氯仿为溶剂 (固定浓度为 6 5 % )时两种螺旋结构均为左旋 (正Cotton效应 ) ,但二氧六环和四氢呋喃为溶剂时均变为右旋 (负Cotton效应 ) .
短句来源
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  cotton effects
     The monoclonal antibodies specific for meso_tetra (α,α,α,α-0-phenylacetyl benzene) porphyrin cause a large shift of the Soret band of meso_tetra (α,α,α,α-0-phenylacetyl benzene) porphyrin to a larger wavelength and great induced Cotton effects (ICD) on meso_tetra (α,α,α,α-0-phenylacetyl benzene) porphyrin.
     meso -四 (α ,α ,α ,α - 0 -苯乙酰苯 )卟啉诱导的单抗 (MAb)导致meso -四 (α,α ,α ,α - 0 -苯乙酰苯 )卟啉Soret带来巨大红移 ,并且在meso -四 (α ,α ,α ,α - 0 -苯乙酰苯 )卟啉上产生巨大的诱导Cotton效应 (ICD) .
短句来源
     The coordination structures of species have been deduced by Cotton effects in the range of 750-200 nm.
     根据750~200nm光谱内的Cotton效应,确定了测量条件下络合物的绝对构型。
短句来源
     Using the Kronig-Kramers formula in crystal and the approximation of a Gaussian CD band, the specific rotatory powers of NYAB crystal in the Z direction were evaluated from the parameters of its Cotton effects.
     将Kronig-Kramers变换公式应用于晶体,在高斯型CD带近似下,给出了晶体旋光度与Cotton效应参数的关系式。
短句来源
     THE COTTON EFFECTS AND OPTICAL ACTIVITY ESTIMATION OF NYAB CRYSTAL
     NYAB晶体的COTTON效应和旋光度估算
短句来源
     CD (circular dichroisin ) spectra of neodymium yttrium aluminum borate (NYAB) crystal were measured over a wavelength range of 300 ̄800nm with a CARY model 61 CD spectropolarimeter at room temperature under constant nitrogen flush. The parameters of Cotton effects were given.
     本文报道了NYAB[四硼酸铝钇钕,NdxY1-xAl3(Bo3)4]在室温下,300~800nm波长范围内晶体Z轴方向的CD谱(圆二色性谱)测定的结果,给出了相应的Cotton效应参数。
短句来源
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  “cotton效应”译为未确定词的双语例句
     The effects of salt and chain length on split CD were also discussed.
     同时还讨论了盐及冠醚链长对裂分Cotton效应的影响。
短句来源
     The specific optical rotations of products 2c, 2d and 2e were also comparable to those inliterature. The enantiomeric excess(e. e) value were determined to be no less than 95 % on a L - 4 - hydroxyproline - bonded high - performance ligand exchange column.
     其构型通过它们的圆二色谱在215nm处的正Cotton效应以及与文献比较比旋光值得到证实 用L-4-羟脯氨酸手性高效配体交换液相色谱柱拆分2,结果表明其对映体过量均不少于95%.
短句来源
     CD spectra of host-guest recognition behavior were also studied.
     利用圆二色光谱研究了识别过程的Cotton效应.
短句来源
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  cotton effect
The circular dichroism spectra of amino alcohols I and II revealed a strong positive Cotton effect in the region of 230 nm, which correlates with the S-configuration of the chiral carbinol center.
      
The influence of the chemical structure of the benzodiazepines on the induced Cotton effect is discussed.
      
The sign of the Cotton effect II can be predicted by a proposed sector rule.
      
Δ4-3-Ketosteroids exhibit an intensive negative Cotton effect on the circular dichroism (CD) spectra in the wavelength range for the n-π* electronic transition (270-?350 nm).
      
A negative Cotton effect is observed in the circular dichroism (CD) spectra of 6-oxo-morphinans in the wavelength range of n-π* electron transitions.
      
更多          
  cotton effects
The positions and intensities of the Cotton effects in CD spectra of the MP-2 peptide and its retro-analogue in various solvents are almost indistinguishable.
      
Nearly all substances give biphasic extrinsic Cotton effects.
      
Besides a simple correction for the different densities of the solvent and the solution a systematic error has to be taken into consideration, which results from a reflection in the sample cell and may erroneously be taken for Cotton effects.
      
Bidentate complexes of dimolybdenum tetraacetate with 1,3-diaxial diols show Cotton effects around 490-540 nm (CD band I), 400-440 nm (II), 350-380 nm (III), 320 nm (IV) and 280 nm (V).
      
It seems that from the Cotton effects for cyclic 1,3-diols the absolute configurations or conformations can be obtained.
      
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In this paper, the ORD and sector projection of 6 synthetic γ-lactone intermediates of Qinghaosu(Arteannuin) are reported. By-using ketone octant rule, lactone chirality rule and lactone sector rule, the predicted cotton effects of these compounds coincided with the result of determination and so the absolute configurations were assigned.

本文报道了6个青蒿素合成中间体—γ内酯化合物—的旋光谱和扇形图。应用羰基的八区律、内酯的手性规则和内酯的扇形规则,所预测的这些化合物的cotton效应与实测结果一致,从而指定了它们的绝对构型。

This paper deals with the determination of the A,B ring configuration of artean-

青蒿酸甲酯4环氧化所得的化合物5和6经三氟化硼重排生成的7及其表异构物8在圆二色谱294nm 附近分别出现负的和正的 Cotton 效应.因而推定青蒿酸的 A,B 环为顺式稠合.用双氢青蒿酸甲酯也得到相同的 CD 结果.

A new bicyclo[9.3.0]tetradecane diterpenoid (dolabellane) lactone 3 was isolated from soft coral qunzhuchong (Clavularia sp.). Its partial structure was determinated by spectral analysis and hydrogenation reaction. X-ray analysis established the complete molecular structure of 3 and the relative cofiguration. Finally, according to the negative Cotton effect of n→π CD band of α,β-unsaturated δ-lactone in 252 nm, the absolute configuration was assigned.

由软珊瑚群柱虫Clavularia ap中新分离到一个不含卤素的具Dolabellane骨架的二萜内酯化合物3.由光谱分析和氢化反应确定了3的部分结构。然后由X射线衍射分析得出了整个分子的结构和相对构型。进一步由α、β-不饱和δ内酯在圆二色散中n→π~*区Cotton效应推出了3的绝对构型。

 
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