Confinement Effects on UV鈥揤isible Absorption Spectra: 尾-Carotene Inside Carbon Nanotube as a Test Case
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- 作者：Gregorio Garc铆a ; Ilaria Ciofini ; Manuel Fern谩ndez-G贸mez ; Carlo Adamo
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：April 18, 2013
- 年：2013
- 卷：4
- 期：8
- 页码：1239-1243
- 全文大小：342K
- 年卷期：v.4,no.8(April 18, 2013)
- ISSN：1948-7185
文摘
The effect of the confinement in a single-wall carbon nanotube on the optical properties of 尾-carotene is studied at the time-dependent density functional theory level. A complex computational protocol has been developed, based on a multilayered ONIOM approach making use of a recent range-separated hybrid functional as well as dispersion corrections. The role of both mechanical and electronic embedding has been clearly pointed out, showing how the inclusion of the latter is mandatory for a correct description of the experimental data. The correct calculation of the bathochromic shift experimentally observed upon encapsulation (0.23 eV) shows the ability of this computational protocol to reproduce all the physics behind such a complex host鈥揼uest interaction. From a more chemical point of view, this study allows one to show how such a shift is related to both geometrical and polarization effects.