Excited state dipole moments and lifetimes of 2-cyanoindole from rotationally resolved electronic Stark spectroscopy.

Excited state dipole moments and lifetimes of 2-cyanoindole from rotationally resolved electronic Stark spectroscopy.
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来自旋转分辨电子斯塔克光谱的 2-氰基吲哚的激发态偶极矩和寿命

DOI:
10.1039/d1cp00097g
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发表时间:
2021
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
Michael Schmitt
Michael Schmitt
中科院分区:
--
文献类型:
--
作者:
Marie-Luise Hebestreit;Hilda Lartian;Christian Henrichs;Ralf Kuehnemuth;W. Leo Meerts;Michael Schmitt

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2-氰基吲哚(氰基吲哚 = CNI)在基态和最低激发单线态下的永久偶极矩已通过喷射冷却条件下的旋转分辨电子斯塔克光谱测定。从跃迁偶极矩的方向和电子激发时的几何变化来看,最低激发单重态可以显示为 Lb 对称性。 La 态在两个最低激发单重态中具有较大永久偶极矩的一般说法将在本贡献中受到挑战。根据第一激发单重态的不同电子性质,讨论了 2-、3-、4- 和 5-CNI 的行为。气相中孤立的 2-CNI 的激发态寿命已确定为 9.4 ns。将此值与乙酸乙酯溶液中 2.6 ns 的激发态寿命进行比较,后者通过 Strickler-Berg 分析进行量化。使用水作为溶剂可将 2-CNI 寿命缩短至 <40 ps。详细讨论了这种急剧缩短的原因。此外,还测量并分析了 2-CNI(1-d1) 的旋转分辨电子能谱。
The permanent dipole moments of 2-cyanoindole (cyanoindole = CNI) in its ground and lowest excited singlet states have been determined from rotationally resolved electronic Stark spectroscopy under jet-cooled conditions. From the orientation of the transition dipole moment and the geometry changes upon electronic excitation the lowest excited singlet state could be shown to be of Lb-symmetry. The general statement, that the La-state has the larger permanent dipole moment of the two lowest excited singlet states, will be challenged in this contribution. On the basis of the different electronic nature of the first excited singlet state the behavior of 2-, 3-, 4- and 5-CNI is discussed. The excited state lifetime of isolated 2-CNI in the gas phase has been determined to be 9.4 ns. This value is compared to the excited state lifetime in ethyl acetate solution of 2.6 ns, which was quantified with a Strickler–Berg analysis. Using water as solvent shortens the 2-CNI lifetime to <40 ps. The reason for this drastic shortening is discussed in detail. Additionally, the rotationally resolved electronic spectrum of 2-CNI(1-d1) has been measured and analyzed.
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