PHOTOCHEMICAL CHARACTERISTICS OF CYANINE DYES .1. 3,3'-DIETHYLOXADICARBOCYANINE IODIDE
PHOTOCHEMICAL CHARACTERISTICS OF CYANINE DYES .1. 3,3'-DIETHYLOXADICARBOCYANINE IODIDE
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DOI：
10.1039/f29726801479
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发表时间：
1972-01-01
期刊：
影响因子：
--
通讯作者：
RANKIN, R
中科院分区：
文献类型：
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作者：
DEMPSTER, DN;THOMPSON, GF;RANKIN, R
用激光和常规闪光光解技术研究了染料3，3 ′-二乙基氧杂硼菁碘（DODI）和3，3 ′-二乙基硫杂硼菁碘（DTDI）。在这两种情况下，直接激发导致形成具有与正常基态吸收的红色类似且略微类似的吸收的光异构体。在这两种情况下，光异构体形成的量子效率小于0.1。在两种情况下观察到的三重态的系间跃迁的量子效率< 0.01，因此通过能量转移技术获得三重态消光系数和光谱。荧光和辐射寿命的量子效率表明，DODI和DTDI的荧光寿命分别为1.24和1.20 ns。
The dyes 3,3′-diethyloxadicarbocyanine iodide (DODI) and 3,3′-diethylthiadicarbocyanine iodide (DTDI) were investigated using laser and conventional flash photolysis techniques. In both cases direct excitation results in the formation of a photo-isomer having an absorption similar to and slightly to the red of the normal ground state absorption. The quantum efficiency for photo-isomer formation in both cases is less than 0.1. The quantum efficiency for intersystem crossing to the triplet state was observed to be < 0.01 in both cases and the triplet state extinction coefficients and spectra were therefore obtained by energy transfer techniques. The quantum efficiencies for fluorescence and radiative lifetimes obtained indicated that the fluorescence lifetimes were 1.24 and 1.20 ns for DODI and DTDI respectively.