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Title: Ab Initio Calculations Show Why m-Phenylene Is Not Always a Ferromagnetic Coupler
Author: Shu Fang(方曙) ; Ming-Shi Lee ; David A. Hrovat ; Weston Thatcher Borden
Source: Journal of the American Chemical Society
Issued Date: 1995
Issue: 117, Pages:6727-6731
Keyword: Ab Initio Calculations ; m-Phenylene ; Ferromagnetic Coupler
Subject: 其他
Indexed Type: 其他
Abstract: In agreement with the experimental results of the groups of Rassat and Iwamura on respectively m-phenylene bis(tert-butyl nitroxides) 2 and 3, ab initio calculations on m-benzoquinodimethane (la) and m-phenylene bis(nitroxide) (la) find that near dihedral angles of 4 = 90" between the benzene ring and the radical-bearing groups, the singlet falls below the triplet in energy. The change in m-phenylene from a ferromagnetic coupler at angles around 4 = 0" to an antiferromagnetic coupler around 4 = 90" is found to be largely due to selective destabilization of the antisymmetric (A) combination of the singly-occupied orbitals on each of the radical centers by a u orbital of this symmetry on the m-phenylene coupler. The asymmetry about 4 = 90" in the singlet-triplet energy difference that is calculated for Id is shown to be due to additional interactions of the oxygens of the singly-occupied nitroxyl orbitals with p-n AOs of the benzene ring.
Language: 英语
Content Type: 期刊论文
URI: http://ir.las.ac.cn/handle/12502/1099
Appears in Collections:中国科学院成都文献情报中心_情报研究部_期刊论文

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Recommended Citation:
Shu Fang,Ming-Shi Lee,David A. Hrovat,et al. Ab Initio Calculations Show Why m-Phenylene Is Not Always a Ferromagnetic Coupler[J]. Journal of the American Chemical Society,1995(117):6727-6731.
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