5, 12‐Diaminotetracenes: The Impact of Orbital Interactions between the Acene π System and Amino Groups on Their Electronic States. Issue 60 (4th October 2018)

• Record Type: Journal Article
• Authors: Uebe, Masashi; Kawashima, Kenji; Ito, Akihiro
• Is Part Of: Chemistry. Volume 24:Issue 60(2018)
• Page Start: 16113
• Page End: 16125
• Publication Date: 2018-10-04
• Subjects: acenes -- conformation analysis -- oxidation -- pi interactions -- substituent effects; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201803090
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 5, 12‐Diamino‐substituted tetracenes with various N‐substituents have been prepared, and their molecular structural changes upon oxidation have been evaluated in association with their electronic structures. The N‐substituents influence both the electronic and molecular structures of the oxidized species of 5, 12‐diaminotetracenes. The tetracene moiety of 5, 12‐bis( N, N ‐dianisylamino)tetracene retained its planarity during the course of two successive one‐electron oxidations, whereas 5, 12‐bis( N, N ‐dimethylamino)tetracene and 5, 12‐bis( N ‐anisyl‐ N ‐methylamino)tetracene underwent substantial structural changes into butterfly like structures through a simultaneous two‐electron oxidation process. The molecular structures in the oxidized states were closely related to the nature of the highest occupied orbitals, which were characterized by the extent of mixing between the fragment orbitals for the teracene moiety and the substituted amino groups in 5, 12‐diaminotetracenes. As a consequence, the present work revealed that the extent of folding deformation of the acene moiety in the oxidized diaminoacenes could be fine‐tuned by varying the N‐substituents. Abstract : Be more butterfly : 5, 12‐Diaminotetracenes with various N‐substituents were investigated. The N‐substituents influence the electronic and molecular structures of their oxidized species (see scheme). Structural changes in the oxidized states can be explained by the nature of the highest occupied orbital, as determined by the extent of mixing between the fragment orbitals for the teracene moiety and substituted amino groups.