Seret A, Hoebeke M, Van de Vorst A
Université de Liège, Physique Expérimentale, Institut de Physique, Belgium.
Photochem Photobiol. 1990 Sep;52(3):601-4. doi: 10.1111/j.1751-1097.1990.tb01805.x.
Monomers and aggregates of Merocyanine 540 (MC540) in water are able to photoisomerize. The shape of the photoisomer absorption spectrum is very similar to that of the ground state. Triplet state of MC540 in water has been produced by energy transfer from triplet anthracene and displays a broad absorption spectrum between 600 and 700 nm. The triplet state may also be produced by direct excitation of MC540 with UV light. However, when the dye is excited by visible light, no triplet state absorbance in the red could be detected so that the triplet yield of MC540 in water seems to be excitation wavelength dependent.
水中部花青540（MC540）的单体和聚集体能够发生光异构化。光异构吸收光谱的形状与基态非常相似。水中MC540的三重态是由三重态蒽的能量转移产生的，在600至700纳米之间呈现出宽吸收光谱。三重态也可以通过用紫外光直接激发MC540产生。然而，当该染料由可见光激发时，在红色区域未检测到三重态吸光度，因此水中MC540的三重态产率似乎与激发波长有关。
