用于推断非对称分子的构型和构象的一种旋光光谱。光学活性物质对组成平面偏振光的左旋和右旋圆偏振光的吸收系数(ε)是不相等的,εL≠εR,即具有圆二色性。如果以不同波长的平面偏振光的波长λ为横坐标,以吸收系数之差Δε=εL-εR为纵坐标作图,得到的图谱即是圆二色光谱,简称CD。如果某手性化合物在紫外可见区域有吸收,就可以得到具有特征的圆二色光谱。由于εL≠εR,透射光不再是平面偏振光,而是椭圆偏振光,摩尔椭圆度[θ]与Δε的关系为:[θ]=3300Δε。圆二色谱也可以摩尔椭圆度为纵坐标,以波长为横坐标作图。由于△ε有正值和负值之分,所以圆二色谱也有呈峰的正性圆二色谱和呈谷的负性圆二色谱。在紫外可见光区域测定圆二色谱与旋光谱,其目的是推断有机化合物的构型和构象。
2021-05-31 09:41:43 121.76MB 圆二色谱
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谱光滑算法之一,多参数可调,适合核专业同学进行能谱处理
2021-05-11 19:18:49 2KB 谱处理
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万通电化学工作站分析软件
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Circular dichroism (CD) spectroscopy is a highly used method for the examination and characterization of proteins, including, amongst other features, their secondary and tertiary structures, thermal stability, comparisons of wildtype and mutant proteins, and monitoring the binding of small molecules, folding/unfolding pathways, and formation of macromolecular complexes. This article describes CDtoolX, a new, user‐friendly, free‐to‐download‐and‐use software program that enables processing, displaying, archiving, calibrating, comparisons, and analyses of CD and synchrotron radiation circular dichroism spectroscopic data.
2019-12-21 21:57:19 15.59MB cd' 园二色谱
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