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Electronic and Vibrational Structures of Corannulene Anions

机译:Corannulene阴离子的电子和振动结构

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摘要

Electronic and vibrational structures of anionic corannulenes, C_(20)H_(10)~-, C_(20)H_(10)~(2-), C_(20)H_(10)~(3-), and C_(20)H_(10)~(4-), are studied on the basis of the ab initio molecular orbital calculation at the HF/6-31G~(**), MP2/6-31G~(**)//HF/6-31G~(**), and CASSCF/6-31G~(**)//HF/6-31G~(**) levels of theory. Analytical solutions of Huckel Hamiltonian are also presented. The difference in geometries and electronic and vibrational structures among these corannulene anions, and the Jahn-Teller effect appearing in C_(20)H_(10)~- and C_(20)H_(10)~(3-) are discussed. The ground state of dianion is a singlet state. It is found that the wavenumbers of the infrared-active C-H stretching mode of corannulene anions decrease linearly as corannulene become more negative. It can be used as the identification of the reduction stage of a corannulene anion. We also found that the Jahn-Teller coupling of trianion is larger than that of monoanion.
机译:阴离子Corannulenes C_(20)H_(10)〜-,C_(20)H_(10)〜(2-),C_(20)H_(10)〜(3-)和C_(在HF / 6-31G〜(**),MP2 / 6-31G〜(**)// HF的从头算分子轨道计算的基础上研究了20)H_(10)〜(4-) / 6-31G〜(**)和CASSCF / 6-31G〜(**)// HF / 6-31G〜(**)的理论水平。还介绍了Huckel哈密顿量的解析解。讨论了这些氢化萘环阴离子之间的几何形状,电子和振动结构的差异,以及在C_(20)H_(10)〜-和C_(20)H_(10)〜(3-)中出现的Jahn-Teller效应。二价阴离子的基态是单重态。可以发现,随着氢化喃环烯的负离子含量的增加,氢化萘环阴离子的红外活性C-H拉伸模的波数呈线性下降。可用作鉴定香兰素阴离子还原阶段的方法。我们还发现,三阴离子的Jahn-Teller偶合大于单阴离子的Jahn-Teller偶合。

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