Second hyperpolarizability of ethynyl-linked azobenzene molecular wires

Jonathan L Humphrey; Kimberly M Lott; Michael E Wright; Darius Kuciauskas

doi:10.1021/jp054980r

Second hyperpolarizability of ethynyl-linked azobenzene molecular wires

J Phys Chem B. 2005 Nov 24;109(46):21496-8. doi: 10.1021/jp054980r.

Authors

Jonathan L Humphrey¹, Kimberly M Lott, Michael E Wright, Darius Kuciauskas

Affiliation

¹ Department of Chemistry, Virginia Commonwealth University, 1001 W. Main Street, Richmond, Virginia 23284-2006, USA.

PMID: 16853790
DOI: 10.1021/jp054980r

Abstract

A series of oligomers consisting of ethynyl-linked azobenzene units was prepared using Pd-catalyzed cross coupling. The linear and nonlinear optical properties of the oligomers were investigated. The molecular second hyperpolarizability, gamma, followed the power law gamma proportional, variant n(2.12+/-0.05) (n is the number of repeat units) for unusually large molecular lengths exceeding 360 conjugated bonds (>49 nm). The exceptional exciton delocalization length is attributed to the rigidity of the conjugated backbone.