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A QTAIM and stress tensor investigation of the torsion path of a light-driven fluorene molecular rotary motor

Author(s)
Hu, Ming XingXu, TianlvMomen, RoyaHuan, GuoKirk, Steven R.Jenkins, SamanthaFilatov, Mechael
Issued Date
2016-11
DOI
10.1002/jcc.24487
URI
https://scholarworks.unist.ac.kr/handle/201301/20672
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/jcc.24487/abstract
Citation
JOURNAL OF COMPUTATIONAL CHEMISTRY, v.37, no.29, pp.2588 - 2596
Abstract
The utility of the QTAIM/stress tensor analysis method for characterizing the photoisomerization of light driven molecular rotary machines is investigated on the example of the torsion path in fluorene molecular motor. The scalar and vector descriptors of QTAIM/stress tensor reveal additional information on the bonding interactions between the rotating units of the motor, which cannot be obtained from the analysis of the ground and excited state potential energy surfaces. The topological features of the fluorene motor molecular graph display that, upon the photoexcitation a certain increase in the torsional stiffness of the rotating bond can be attributed to the increasing topological stability of the rotor carbon atom attached to the rotation axle. The established variations in the torsional stiffness of the rotating bond may cause transfer of certain fraction of the torsional energy to other internal degrees of freedom, such as the pyramidalization distortion.
Publisher
WILEY-BLACKWELL
ISSN
0192-8651
Keyword (Author)
photoisomerizationlight driven molecular rotary machineQTAIMstress tensor
Keyword
DENSITY-FUNCTIONAL THEORYREFERENCED KOHN-SHAMCONICAL INTERSECTIONSEXCITED-STATESELECTRONIC-STRUCTUREQUANTUM TOPOLOGYHYDROGEN-BONDDYNAMICSPHOTOISOMERIZATIONATOMS

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