Visible Light Induced Electron Transfer and Long-Lived Charge Separated State in Cyanine Dye/Layered Titanate Intercalation Compounds
Visible Light Induced Electron Transfer and Long-Lived Charge Separated State in Cyanine Dye/Layered Titanate Intercalation Compounds
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DOI：
10.1021/jp035617s
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发表时间：
2004-03
影响因子：
3.3
通讯作者：
N. Miyamoto;K. Kuroda;M. Ogawa
中科院分区：
文献类型：
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作者：
N. Miyamoto;K. Kuroda;M. Ogawa
在菁染料/层状钛酸盐插层化合物中，发现可见光诱导的主客体电子转移和长寿命电荷分离态的形成。通过阳离子交换反应，将1，1 ′-二乙基-2，2 ′-花菁（染料-1）和5，5 ′-二氯-3，3 ′，9-三乙基硫代碳菁（染料-2）插层到层状钛酸盐CsxTi_（2-x）/4□x/4 O_4（□ =空位，x = 0.7）和Na_2 Ti_3 O_7中。通过X射线衍射、元素分析、可见吸收光谱和荧光光谱等手段证实了插层化合物的形成。对于所有的染料/钛酸盐体系，插层染料在层间空间中形成J-聚集体。可见光诱导的电子转移表现为ESR信号的出现，这归因于染料的自由基二价阳离子，并通过染料聚集体的荧光猝灭。从ESR信号的衰减曲线估计电荷分离态的表观寿命。那个...
Visible light induced guest-to-host electron transfer and formation of long-lived charge separated state were demonstrated in cyanine dye/layered titanate intercalation compounds. 1,1‘-Diethyl-2,2‘-cyanine (dye-1) and 5,5‘-dichloro-3,3‘,9-triethyl-thiacarbocyanine (dye-2) were intercalated into layered titanates, CsxTi2-x/4□x/4O4 (□ = vacancy, x = 0.7) and Na2Ti3O7, by cation exchange reactions with alkylammonium-exchanged forms as the intermediates. The formation of the intercalation compounds was confirmed by XRD, elemental analysis, and visible absorption and fluorescence spectroscopies. The intercalated dyes formed J-aggregates in the interlayer spaces for all the dye/titanate systems. The visible light induced electron transfer was shown by the appearance of ESR signal, which was ascribed to the radical dications of the dyes, and by the quenching of the fluorescence of the dye aggregates. Apparent lifetimes of the charge separated states were estimated from the decay curve of the ESR signal. The char...