The π → π* excited states of long linear polyenes studied by the CASCI-MRMP method

The π → π* excited states of long linear polyenes studied by the CASCI-MRMP method
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DOI:
10.1016/j.cplett.2004.10.141
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发表时间:
2004-12-21
影响因子:
2.8
通讯作者:
Hirao, K
Hirao, K
中科院分区:
化学4区
文献类型:
--
作者:
Kurashige, Y;Nakano, H;Hirao, K

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采用具有完全活性空间组态相互作用的多参考Moller-Plesset微扰理论(CASCI-MRMP)研究了全反式线性多烯C2 nH 2n +2(n = 3-14)的价态π-> π * 激发态.我们的重点是确定四个最低激发态的性质,2(1)A(g)(-),1(1)B(u)(+),1(1)B(u)(-)和3(1)A(g)(-)及其排序。离子1(1)B(u)(+)态是最低光学允许激发态,而共价2(1)A(g)(-)、1(1)B(u)(-)和3(1)A(g)(-)态是光学禁戒态。理论预测,当n大于或等于7时,1(1)B(u)(-)状态变得低于1(1)B(u)(+)状态,并且当n大于或等于(C)时,3(1)A(g)(-)状态也变得低于1(1)B(u)(+)状态。2004 Elsevier B. V.保留所有权利。
Multireference Moller-Plesset perturbation theory with complete active space configuration interaction (CASCI-MRMP) is applied to the study of the valence pi --> pi* excited states of all-trans linear polyenes C2nH2n+2(n = 3-14). Our focus was to determine the nature of the four lowest-lying singlet excited states, 2(1)A(g)(-), 1(1)B(u)(+), 1(1)B(u)(-) and 3(1)A(g)(-) and their ordering. The ionic 1(1)B(u)(+) state is the lowest optically allowed excited state, while the covalent 2(1)A(g)(-), 1(1)B(u)(-) and 3(1)A(g)(-) states are the optically forbidden states. Theory predicts that the 1(1)B(u)(-) state becomes lower than the 1(1)B(u)(+) state at n greater than or equal to 7 and that the 3(1)A(g)(-) state also becomes lower than the 1(1)B(u)(+) state at n greater than or equal to (C) 2004 Elsevier B.V. All rights reserved.