叶绿素聚集体的延迟发光

石油醚中的叶绿素聚集体在照光后数分钟内会发出微弱的光来。这延迟发光的衰减曲线包含两个相:持续十秒左右的快速相和持续数分钟的慢速相。在四氯化碳中的叶绿素聚集体的延迟发光的衰减曲线和石油醚中的不同。延迟发光的强度在电子供体或递体存在时减弱。当聚集体解聚后,延迟发光现象消失。

THE DELAYED LIGHT EMISSION OF THE AGGREGATED CHLOROPHYLL

The chlorophyll in non-polar solvent could aggregated into dimer or polymers. The aggregated chlorophyll in petroleum ether (mainly polymers) could emit faint light for a few minutes after illumination. The decay curves of the delay light emission (DLE) showed two phases:fast phase which lasted for about ten seconds and slow phase which lasted for about several minutes. The intensity of the fast phase would increase slightly when the illumination time was sustained more than one minute, while the intensity of slow phase would increase continuously, The decay curves of the DLE of aggregated chlorophyll in CC14 (mainly dimers) was different from that in petroleum ether:the intensity of the slow phase was reduced obviously, while the intensity of the fast phase was as same as that in petroleum ether. The intensity of the DLE was lowered by adding electronic donor or accepter When the aggregated chlorophyll was disaggregated, there was no DLE. It was evident that light energy could store up in the molecules of chlorophyll aggregates.