COMPREHENSIVE INVESTIGATION OF THE SOLUTION PHOTOPHYSICS AND THEORETICAL ASPECTS OF OLIGOTHIOPHENES OF 1-7 RINGS
COMPREHENSIVE INVESTIGATION OF THE SOLUTION PHOTOPHYSICS AND THEORETICAL ASPECTS OF OLIGOTHIOPHENES OF 1-7 RINGS
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DOI：
10.1351/pac199567010009
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发表时间：
1995-01-01
影响因子：
1.8
通讯作者：
ELISEI, F
中科院分区：
文献类型：
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作者：
BECKER, RS;DEMELO, JS;ELISEI, F
对噻吩（n=1）和寡噻吩（n=2- 5,7）的光物理(phi(F), tau(F), phi(T), tau(T))，吸收S(O) -> S(X)和T（I) -> T(X)）和发射（荧光和磷光）进行了评价。此外，对n=2- 5,7时的k(F)、k（IC）和k（ISC）进行了评估。一般来说，从n=2到5，phi(F)增加，并成为常数（n=5-7），而phi(T)从n=2,3（几乎相同）到n= 5,7，整体减少。当n从n=3增加到7时，k（ISC）逐渐减小，k(F)大致保持不变。随着n的增加，tau(F)逐渐变长，而tau(T)逐渐变短，两者在n= 5,7时保持不变。根据k(F)（或tau度(F)）和其他数据，很明显，与其他现有的预测（对于n=6及更大）相比，从n=2到包括n=7, 1b型状态总是低于1a型状态。虽然除噻吩外，所有化合物都存在荧光，但除噻吩外，未观察到磷光(phi（P)小于或等于5 × 10(-4)）。给出了使光物理行为合理化的机制。
Photophysical (phi(F), tau(F), phi(T), tau(T)), absorption S(O) --> S(X) and T(I) --> T(x)) and emission (fluorescence and phosphorescence) have been evaluated for thiophene (n=1) and oligothiophenes (n=2-5, 7). In addition k(F), k(IC) and k(ISC) have been evaluated for n=2-5, 7. In general phi(F) increases from n=2 to 5 and becomes constant (n=5-7) whereas phi(T) decreases overall from n=2,3 (nearly same) to constancy at n=5, 7. The k(ISC) progressively decreases and k(F) remains approximately constant as n increases from n=3 to 7. The tau(F) progressively gets longer while tau(T) gets shorter as n increases and both become constant at n=5, 7. Based on k(F) (or tau-degrees(F) and other data, it is clear that the 1B-type state is always below the 1A-type state fron n=2 to and including n=7, in contrast to other existing predictions (for n=6 and greater). Although fluorescence exists for all compounds, except thiophene, no phosphorescence has been observed (phi(P) less-than-or-equal-to 5 x 10(-4)), except thiophene. Mechanisms rationalizing the photophysical behavior are given.