溶液中细菌叶绿素阳离子的氮电子核双共振和质子三重共振实验。
Nitrogen electron nuclear double resonance and proton triple resonance experiments on the bacteriochlorophyll cation in solution.
作者信息
Hoff A J, Möbius K
出版信息
Proc Natl Acad Sci U S A. 1978 May;75(5):2296-300. doi: 10.1073/pnas.75.5.2296.
Abstract
Electron nuclear double resonance signals of the pyrrole nitrogens of bacteriochlorophyll alpha cation in a solution of CH2Cl2/CH3OH (6:1) have been observed. The nitrogens are inequivalent: the hyperfine coupling constants were determined to be 2.36 and 3.18 MHz (0.84 and 1.14 G, respectively). Triple electron nuclear double resonance experiments have yielded the signs and values of nine proton hyperfine coupling constants. The assignment based on these data agrees well with previous work (Borg, D.C., Forman, A. & Fajer, J. (1976) J. Amer. Chem. Soc. 98, 6889-6893); in addition, two methine protons have been identified. Spin densities calculated from the hyperfine couplings are compared to reported molecular orbital calculations.
摘要
在二氯甲烷/甲醇（6:1）溶液中，已观测到细菌叶绿素α阳离子吡咯氮的电子核双共振信号。这些氮是不等价的：超精细耦合常数分别测定为2.36和3.18 MHz（分别为0.84和1.14 G）。三重电子核双共振实验得出了九个质子超精细耦合常数的符号和数值。基于这些数据的归属与先前的工作（Borg, D.C., Forman, A. & Fajer, J. (1976) J. Amer. Chem. Soc. 98, 6889 - 6893）非常吻合；此外，还鉴定出了两个次甲基质子。将根据超精细耦合计算出的自旋密度与报道的分子轨道计算结果进行了比较。
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本文引用的文献
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Proc Natl Acad Sci U S A. 1976 Dec;73(12):4282-6. doi: 10.1073/pnas.73.12.4282.
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New proposal for structure of special-pair chlorophyll.特殊对叶绿素结构的新提议。
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Molecular basis for the photosynthetic primary process.光合作用初级过程的分子基础。
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The cation radicals of free base and zinc bacteriochlorin, bacteriochlorophyll, and bacteriopheophytin.游离碱、锌细菌叶绿素、细菌叶绿素和细菌脱镁叶绿素的阳离子自由基。
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The Crystal and Molecular Structure of Ethyl Chlorophyllide a.2H(2)O and Its Relationship to the Structure and Aggregation of Chlorophyll a.焦脱镁叶绿酸a·2H₂O的晶体结构和分子结构及其与叶绿素a的结构和聚集的关系
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