VISIBLE AND NEAR-INFRARED MAGNETIC CIRCULAR-DICHROISM SPECTRA OF HIGH-SPIN IRON(III) COMPLEXES OF PROTOPORPHYRIN-IX-DIMETHYLESTER - CHARACTERIZATION OF CHARGE-TRANSFER BANDS OF HIGH-SPIN HEME [FE(III)]
VISIBLE AND NEAR-INFRARED MAGNETIC CIRCULAR-DICHROISM SPECTRA OF HIGH-SPIN IRON(III) COMPLEXES OF PROTOPORPHYRIN-IX-DIMETHYLESTER - CHARACTERIZATION OF CHARGE-TRANSFER BANDS OF HIGH-SPIN HEME [FE(III)]
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DOI：
10.1016/s0162-0134(00)80206-8
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发表时间：
1980-01-01
影响因子：
3.9
通讯作者：
HATANO, M
中科院分区：
文献类型：
--
作者：
NOZAWA, T;OOKUBO, S;HATANO, M
利用磁性圆二色性（MCD）光谱研究了几种5配位的血红素[Fe（III）]配合物在近紫外到近红外波段（300-1200 nm）的磁性圆二色性，并对MCD谱带的性质进行了表征，特别是在可见光和近红外波段（500-1200 nm）。MCD光谱表明，可见光和近红外MCD波段的波长和幅度取决于轴向配体的性质。该依赖性可以基于定性分子轨道理论通过使用先前提出的这些谱带可归因于面内卟啉π的分配来解释。到金属电荷转移跃迁所观察到的溶剂和环境的MCD模式和大小的模型血红素复合物的影响给一些本地血红素环境的影响。
Magnetic circular dichroism (MCD) spectra for several 5-coordinated heme [Fe(III)] complexes were observed from the near-UV to the near-IR regions (300-1200 nm) to characterize the nature of the MCD bands especially in the visible and near-IR regions (500-1200 nm). The MCD spectra reveal that the wavelengths and magnitudes of the visible and near-IR MCD bands depend critically on the nature of the axial ligand. The dependence can be explained on the basis of a qualitative molecular orbital theory by using the previously proposed assignment that these bands are attributable to the in-plane porphyrin .pi. to metal charge-transfer transitions. The observed effects of solvent and environment on the MCD patterns and magnitudes of the model heme complexes give some implications about the heme environments of native hemoproteins.