各向异性样品的CD和ACD光谱:定向分子的手性和各向异性相——一个关键的分析。

Enantiomer Pub Date : 2002-07-01 DOI:10.1080/10242430212880
H. Kuball
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引用次数: 16

摘要

手性各向异性相表现为椭圆双折射和二色性,而不是各向同性不对称的圆形效应和非手性各向异性相的线性效应。因此,确定手性各向异性相的手性效应的技术并不总是产生手性测量的结果,即伪标量量。从无取向和有取向宏观各向异性相的手性测量的定义出发,推导了包含在椭圆双折射和二色性中的伪标量贡献的方法。在这一描述中,各向同性分布在压制KBr板或Nujol中的手性微晶的CD是一种手性测量。当压下的KBr板中存在过量的各向异性分布材料,或者通常具有定向的宏观各向异性相时,ACD不再是一个伪标量。非手性信息包含在ACD中,它不是通过CD光谱仪中的非理想光学元件混合“圆效应和线性效应”而获得的伪影。
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CD and ACD spectroscopy on anisotropic samples: chirality of oriented molecules and anisotropic phases--a critical analysis.
Chiral anisotropic phases exhibit an elliptical birefringence and dichroism instead of the circular effects of isotropic dissymmetric and the linear effects of achiral anisotropic phases. Therefore, techniques to determine chiral effects of chiral anisotropic phases yield not always results of chirality measurements, namely, pseudoscalar quantities. From definitions for a chirality measurement with non-oriented and oriented macroscopic anisotropic phases procedures are derived by which the pseudoscalar contribution included in the elliptical birefringence and dichroism can be obtained. Within this description the CD of chiral microcrystallites, isotropically distributed in pressed KBr plates or in Nujol, is a chirality measurement. With an excess of anisotropic distributed material in pressed KBr plates or, in general, with oriented macroscopic anisotropic phases, the ACD is no longer a pseudoscalar. An achiral information is included in the ACD which is not an artifact obtained by the mixing of "circular and linear effects" via nonideal optical elements in a CD spectrometer.
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