Title

The HOMO Nodal Arrangement in Polychromophoric Molecules and Assemblies Controls the Interchromophoric Electronic Coupling

Document Type

Article

Language

eng

Format of Original

5 p.

Publication Date

11-2015

Publisher

Wiley-VCH Verlag

Source Publication

Angewandte Chemie International Edition

Source ISSN

1521-3773

Original Item ID

DOI: 10.1002/anie.201506402

Abstract

Triptycenes spontaneously assemble into two-dimensional networks in which long-range charge transport is facilitated by the extensive electronic coupling through the triptycene framework (intramolecularly) and by cofacial π-stacking (intermolecularly). While designing and synthesizing next-generation triptycenes containing polyaromatic chromophores, the electronic coupling amongst the chromophores was observed to be highly dependent on the nature and position of the substituents. Herein, we demonstrate using hexaalkoxytriptycenes that the electronic coupling amongst the chromophores is switched on and off by a simple repositioning of the substituents, which alters the nodal arrangement of the HOMOs of the individual chromophores. A visual inspection of the HOMOs can thus provide a ready evaluation of the electronic coupling in polychromophoric molecules/assemblies, and will serve as an important tool for the rational design of modern charge-transport materials.

Comments

Angewandte Chemie International Edition, Vol 54, No. 48 (November 2015): 14468-14472. DOI.