A FURTHER STUDY OF THE PHOTOTROPY OF CHLOROPHYLL IN SOLUTION1
A FURTHER STUDY OF THE PHOTOTROPY OF CHLOROPHYLL IN SOLUTION1
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DOI：
10.1021/j100818a048
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发表时间：
1962-12
期刊：
影响因子：
--
通讯作者：
R. Livingston;D. Stockman
中科院分区：
文献类型：
--
作者：
R. Livingston;D. Stockman
The reversible photobleaching of chlorophyll and related compounds has been studied in anaerobic ethyl acetate, methanol, pyridine, cyclohexanol, andcastor oil. The extent of the steady state bleaching appears to be independent of theviscosity of the solvent, and under our experimental conditions varies between the limits of 0.31% in cyclohexanol and 0.65% in pyridine. The absorption spectrum of the bleached form of chlorophyll resembles but differs from that of the Krasnovsky pink pigment. The principal absorption maximum (for chlorophyll b in pyridine) is at 545 mji and has an extinction coefficient of about 7 X 104 m~ l cm.-1. Pheophytin and metal-free porphyrinsexhibit little if any7 bleaching, but the bleaching of the metal-complexed pigments (including copper chlorophyll) resembles that ofordinary7 chlorophyll. A mechanism is suggested, which involves a charge transfer between thepigment and a molecule of solvent, or some other reductant, complexed with it.
