PHOSPHORESCENCE OF CHLOROPHYLLS

PHOSPHORESCENCE OF CHLOROPHYLLS
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叶绿素的磷光

DOI:
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发表时间:
1977
期刊:
影响因子:
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通讯作者:
M. Půža
M. Půža
中科院分区:
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文献类型:
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作者:
A. Mau;M. Půža

文献摘要

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虽然叶绿素a的三重态(Chla)在光合作用机制中所起的作用目前是推测性的(Parson和Cogdell,1975),但确实存在证据表明三重态叶绿素确实具有化学活性(Connolly等人,1973年)。为了更好地理解叶绿素的光化学和光物理性质,有必要指定激发单重态和三重态。到目前为止,已经对叶绿素在体外的荧光性质进行了大量的研究,但是处理磷光的工作很少,结果也不明确(Amster,1969;费尔南德斯和Becker,1959; Krasnovskii等人,1973年)。这是因为发射是在红外区,其中大多数检测器是不敏感的,磷光效率预计是低的,和固有的发射往往被掩盖的杂质的存在(Mau,1976)。最近一个俄罗斯小组(Krasnovskii等人,(1973年,1974年)
Although accounts of the role played by the triplet state of chlorophyll a (Chl a) in the mechanism of photosynthesis are at present speculative (Parson and Cogdell, 1975), evidence does exist that the triplet chlorophylls are indeed chemically active (Connolly et a/., 1973). In order to achieve a better understanding of the photochemical and photophysical properties of the chlorophylls it is necessary to assign both the excited singlet and triplet states. So far a substantial number of studies have been conducted on the fluorescence properties of the chlorophylls in uitro, but work dealing with the phosphorescence is sparse and the results are ambiguous (Amster, 1969; Fernandez and Becker, 1959; Krasnovskii et al., 1973). This is because the emissions are in the infrared region in which most detectors are not sensitive, the phosphorescence efficiencies are expected to be low, and the intrinsic emissions are often masked by the presence of impurities (Mau, 1976). Recently a Russian group (Krasnovskii et a/., 1973, 1974) have reported