A ligand field model for MCD spectra of biological cupric complexes.

A ligand field model for MCD spectra of biological cupric complexes.
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生物铜配合物 MCD 光谱的配体场模型。

DOI:
10.1016/s0006-3495(95)79943-x
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发表时间:
1995
期刊:
Biophysical journal.
影响因子:
--
通讯作者:
Whittaker,JW
Whittaker,JW
中科院分区:
--
文献类型:
--
作者:
Landrum,GA;Ekberg,CA;Whittaker,JW

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磁圆二色性(MCD)光谱的配位场计算的描述,提供了新的见解,在金属酶和合成类似物中的铜网站的电子光谱中所包含的信息。配体场模型使用金属为中心的p-和f-轨道来模拟强度的sigma,pi LMCT混合机制,允许从单组参数和晶体学确定的配体坐标同时计算光吸收、MCD和电子顺磁共振谱的基本特征。我们已经使用该模型来预测的光谱变化导致的电子波函数的变换下系统的几何变化在五配位ML 5复合物。证明了两个合成的铜模型化合物和半乳糖氧化酶复合物代表限制配位几何形状的计算的有效性。该分析允许立即识别MCD强度的特征模式和与几何形状的相关性。讨论了过渡金属配合物的MCD谱与CD谱之间的互补原理。
A ligand field calculation of magnetic circular dichroism (MCD) spectra is described that provides new insights into the information contained in electronic spectra of copper sites in metalloenzymes and synthetic analogs. The ligand field model uses metal-centered p- and f-orbitals to model sigma, pi LMCT mixing mechanism for intensity, allowing the basic features of optical absorption, MCD, and electron paramagnetic resonance spectra to be simultaneously computed from a single set of parameters and the crystallographically determined ligand coordinates. We have used the model to predict changes in spectra resulting from the transformation of electronic wavefunctions under systematic variation in geometry in pentacoordinate ML5 complexes. The effectiveness of the calculation is demonstrated for two synthetic copper model compounds and a galactose oxidase enzyme complex representing limiting coordination geometries. This analysis permits immediate recognition of characteristic patterns of MCD intensity and correlation with geometry. A complementarity principle between MCD and CD spectra of transition metal complexes is discussed.
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