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Planarity of ethylene/linear polyene analogues focused on π‐electron holding ability of the components
Author(s) -
Nakamura Taiji,
Imanishi Akira,
Kudo Takako
Publication year - 2019
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.26029
Subject(s) - planarity testing , polyene , chemistry , intramolecular force , atom (system on chip) , electron , silicon , planar , crystallography , ethylene , electron pair , computational chemistry , chemical physics , stereochemistry , molecular physics , physics , organic chemistry , computer graphics (images) , quantum mechanics , computer science , embedded system , catalysis
Ethylene/polyene analogues composed of heavier group 14 elements, such as silicon and germanium, do not prefer a planar structure. In the repulsion dominant (RD) model of our previous study mainly focusing on the planarity of hexasilabenzene, it was demonstrated that electron repulsion promotes nonplanarization of heavy benzene analogues. In this study, we have investigated a correlation between intramolecular π‐electron transfers (polarization effect) and planarity in various linear unsaturated compounds in order to deepen the RD model. Herein, it was revealed that the ability to hold π‐electrons in the planar molecular structure is characteristic of each element. For example, carbon can hold more than one π‐electron, whereas silicon and germanium cannot tolerate even one π‐electron to keep the planar structure. Thus, π‐accepting substituents on the heavy atom were found to make the heavy ethylenes and linear polyenes planar by controlling the number of π‐electrons on each skeletal atom.