Linkage length dependence of intramolecular photoinduced electron transfer reactions in aromatic donor-viologen acceptor molecules linked by polymethylene bridges
Linkage length dependence of intramolecular photoinduced electron transfer reactions in aromatic donor-viologen acceptor molecules linked by polymethylene bridges
复制标题
通过多亚甲基桥连接的芳香族供体-紫精受体分子中分子内光诱导电子转移反应的键长依赖性
DOI：
10.1021/jp981131d
复制
发表时间：
1998
影响因子：
3.3
通讯作者：
Soo Yeon Lee
中科院分区：
文献类型：
--
作者：
J. Park;Bichna Lee;Soo Yeon Lee
研究了多亚甲基（-（CH 2）n-）连接的芳香族给体-紫精受体二元体系中的分子内电荷转移（CT）复合物的形成和光诱导电子转移反应。键中的供体和亚甲基单元的数目为1-萘氧基（n = 3、6、8和10）、2-萘氧基（n = 3−10和12）和2-二苯并呋喃酰基（n = 3、6、8和10）。分子内CT复合物（Kint）的形成常数确定从CT吸收的吸光度通过使用从模型供体化合物，1-芳氧基-3-氨基丙烷，和二甲基紫精之间的分子间络合确定的复合物的吸光度。Kint值几乎不依赖于连接的长度，并且对于1-萘酚和2-萘酚衍生物约为0.2，对于二苯并呋喃酰基衍生物约为0.6。β-CD的加入破坏了分子内CT复合物的形成。测定了二联体分子与β-CD（KCD）的1：1缔合常数。
The intramolecualr charge transfer (CT) complex formation and photoinduced electron-transfer reactions in aromatic donor−viologen acceptor dyad systems linked by polymethylene linkage (-(CH2)n-) have been studied. The donors and the numbers of methylene unit in the linkages are 1-naphthoxyl with n = 3, 6, 8, and 10, 2-naphthoxyl with n = 3−10 and 12, and 2-dibenzofuranoyl with n = 3, 6, 8, and 10. The formation constants of the intramolecular CT complexes (Kint) were determined from the absorbance of CT absorption by using the absorptivities of the complexes determined from the intermolecular complexation between the model donor compounds, the 1-aryloxy-3-aminopropanes, and dimethyl viologen. The Kint values depend little on the length of the linkage and are about 0.2 for 1-naphthol and 2-naphthol derivatives, and 0.6 for dibenzofuranoyl derivatives. The addition of β-CD disrupts the formation of the intramolecular CT complexes. The 1:1 association constants of the dyad molecules with β-CD (KCD) were esti...