El-Daly S A, Asiri A M, Alamry K A
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia,
J Fluoresc. 2014 Jul;24(4):1307-11. doi: 10.1007/s10895-014-1415-y. Epub 2014 Jun 6.
In the present work, the absorption, emission spectra and dipole moments(μ(g), μ(e)) of N, N-bis (2, 5-di-tert-butylphenyl)-3, 4:9, 10- perylenebis (dicarboximide) (DBPI) have been studied in solvents of various polarities at room temperature. Using the methods of solvatochromism, the difference between the first excited singlet state (μ(e)) and ground state (μ(g)) dipole moments was estimated from Lippert - Mataga,, Bakhshiev, Kawski - Chamma - Viallet equations. The change in dipole moment (Δμ) was also calculated using the variation of the Stokes shift with microscopic solvent polarity parameter (E(T)(N)). It was observed that the value of excited singlet state dipole moment is higher (3.53 Debye) than the ground state one (1.92Debye), showing that the excited state of DBPI is more polar than the ground state.
在本工作中，研究了N，N-双（2，5-二叔丁基苯基）-3，4：9，10-苝双（二甲酰亚胺）（DBPI）在室温下于各种极性溶剂中的吸收光谱、发射光谱和偶极矩（μ(g)，μ(e)）。采用溶剂化显色法，根据Lippert - Mataga、Bakhshiev、Kawski - Chamma - Viallet方程估算了第一激发单重态（μ(e)）和基态（μ(g)）偶极矩之间的差异。还利用斯托克斯位移随微观溶剂极性参数（E(T)(N)）的变化计算了偶极矩的变化（Δμ）。观察到激发单重态偶极矩的值（3.53德拜）高于基态偶极矩的值（1.92德拜），这表明DBPI的激发态比基态具有更高的极性。
