反式构象

用FTIR定量测定聚对苯二甲酸乙二酯晶区和非晶区反式构象含量

Quantitative Measurement of the Trans Conformation Content of Crystalline and Amorphous Regions within Poly ( ethylene terephthalate ) by Means of FTIR

结果表明，随退火时间增加，从Tg转变吸热峰确定的过剩热焓松弛量、Tg温度、密度增加，而反式构象含量减少。

The results suggest that the amount of excess enthalpy relaxation as determined from the endothermic peak in T , interval , the Tg and density all increase with annealing time , but the trans-conformation component of samples decreases .

FT-IR谱图表明凝胶与固体分子中的氢键具有相似性，且凝胶剂分子中的碳氢链是采取全反式构象排列的。

FT-IR spectrum demonstrated that the hydrogen bonding in gels and solid powder had some similarities and hydrocarbon chain of organogelator molecules adopted all trans-zigzag conformation in organogels .

二硫键构象已由对照样品的全旁-旁-反式构象（gauche-gauche-trans）转为旁式（gauche）与反-旁-反式并存的构象。

Disulfide conformation samples from the control of the whole next-next-trans conformation ( gauche-gauche-tran s ) adjacent to ( the gauche ) and anti-next-trans conformations coexist .

用付里叶变换红外光谱差减技术获得了聚2,6-萘二甲酸乙二酯（简称PEN-2,6）的纯晶区光谱和非晶区的反式构象光谱；

The pure crystalline spectra and amorphous trans-configuration spectra of the PEN-2 , 6 were obtained by means of FT-IR digital absorbance subtraction technique .

三种γ位手性的共轭烯醛构象的测定结果表明：在溶液中主要以S-反式构象存在。

The results showed that the three r-chiral enals in solution were in the S-trans conformation .

结果表明，脯氨酸采取顺式还是反式构象与其局部的序列以及整条肽链的氨基酸组分均有较强的关联。

The results showed that formation of cis proline was significantly related to the local sequence and amino acid component .

根据核磁图谱的耦合常数表明了配体是一个反式构象。

According to the coupling constant of the 1H NMR , it is show that the ligands are the trans isomer .

表明随结晶温度升高，反式构象增加，旁式构象减少。

It was shown that with increasing crystallization temperature , the trans conformation increases and the gauche con - formation decreases .

烷基胺嵌入层间后以全反式构象双层排布，层间距d随烷基胺碳原子数的增加而线性增长，烷基链与层板的夹角为71.6°。

The results show that the interlayer distance of intercalation compounds increases with the increase in the number of carbon atoms in the n-alkyl chain , and n-alkylamines exhibit a bilayer arrangement in the interlayer space with a tilt angle of 71.6 ° .

结果表明，（+）-樟脑缩苄胺（2a）以反式（trans）构象形式存在，它在不对称反应中的立体选择性主要受樟脑环上方C10甲基的控制。

The result is shown that ( + ) - camphor imine ( 2a ) is kept up a trans configuration and the stereoselectivity of ( 2a ) in asymmetric reaction has been controlled mainly by C10-methyl of ( + ) - camphor .

并结合尿素与硫脲的催化反应过程，讨论了氢键复合物两种可能的顺反异构并分析比较了顺反式构象的异构体之间的稳定性大小。

Two possible hydrogen bonding complexes conformations , cis and trans , were discussed and the energy gaps between them were analyzed , in combination with the catalytic reactions .