Comparative Investigation of Ultrafast Photoinduced Processes in Salicylidene-Aminopyridine in Solution and Solid State †
Comparative Investigation of Ultrafast Photoinduced Processes in Salicylidene-Aminopyridine in Solution and Solid State †
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DOI：
10.1021/jp901849a
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发表时间：
2009-07
影响因子：
3.7
通讯作者：
M. Sliwa;N. Mouton;C. Ruckebusch;S. Aloïse;O. Poizat;G. Buntinx;R. Métivier;K. Nakatani;H. Masuhara
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文献类型：
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作者：
M. Sliwa;N. Mouton;C. Ruckebusch;S. Aloïse;O. Poizat;G. Buntinx;R. Métivier;K. Nakatani;H. Masuhara
采用稳态和瞬态光谱法研究了N-（3,5-二叔丁基水杨基）-4-氨基吡啶（4P）和N-（3,5-二叔丁基水杨基）-2-氨基吡啶（2P）在溶液和固态（微晶粉末）中的光动力学和激发态质子转移（ESIPT）。这两种化合物分别是A类和B类化合物的代表。结果证实，在溶液中，这两种化合物具有相似的动态行为：在390 nm激发时，ESIPT导致不同的顺式酮*荧光物质，这些荧光物质在几十皮秒内弛豫为光致变色的反式酮光产物。此外，首次记录了固体中两类化合物的皮秒数据：在2P中，两个顺式酮*荧光激发态物种（23和250 ps寿命）仅弛豫到顺式酮基态，而在4P中，单个顺式酮*荧光物种通过中间亚稳物种导致250 ps的反式酮光产物。
Photodynamics and excited-state intramolecular proton transfer (ESIPT) of N-(3,5-ditert-butylsalicylidene)-4-aminopyridine (4P) and N-(3,5-ditert-butylsalicylidene)-2-aminopyridine (2P) are studied by steady-state and transient optical spectroscopy in solution and solid state (microcrystalline powder). These two compounds are representative of anils Classes A and B, respectively. The results confirm that in solution both compounds have a similar dynamic behavior: upon excitation at 390 nm, ESIPT leads to different cis-keto * fluorescent species which relax to the photochromic trans-keto photoproduct within a few tens of picoseconds. Furthermore, for the first time, picosecond data are recorded for the two classes of anils in the solid state: in 2P, two cis-keto * fluorescent excited state species (23 and 250 ps lifetime) are relaxing exclusively to the cis-keto ground state, whereas in 4P, a single cis-keto* fluorescent species is observed which leads to the trans-keto photoproduct in 250 ps via an intermediate metastable species.