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Linear and Nonlinear Optical Properties of Azobenzene Derivatives Modified with an (Amino)naphthalene Moiety

Abstract

The design of two-photon absorbing azobenzene (AB) derivatives has received much attention; however, the two-photon absorption (2PA) properties of bis-conjugated azobenzene systems are relatively less explored. Here, we present the synthesis of six azobenzene derivatives and three bisazobenzenes substituted (or not) at para position(s) with one or two amino group(s). Their linear and nonlinear absorption properties are studied experimentally and theoretically. The switching behavior and thermal stability of the Z-isomer are studied for unsubstituted mono- (1a, 2a) and bis-azobenzene (3a) compounds, showing that when the length of the π system increases, the half-life of the Z-isomer decreases. Moreover, along with the increase of π-conjugation, the photochromic characteristics are impaired and the photostationary state (PSS) related to E−Z photoisomerization is composed of 89% of the Z-isomer for 2a and 26% of the Z-isomer for 3a. Importantly, the 2PA cross-section increases almost five-fold on extending the π-conjugation (2a vs 3a) and by about one order of magnitude when comparing two systems: the unsubstituted π-electron one (2a, 3a) with D-π-D (2c, 3c). This work clarifies the contribution of π-conjugation and substituent effects to the linear and nonlinear optical properties of mono- and bis-azobenzene compounds based on the experimental and theoretical approaches.

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DOI:
Digital Object Identifier (open in new tab) 10.1021/acs.jpcb.2c03078
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Category:
Articles
Type:
artykuły w czasopismach
Published in:
JOURNAL OF PHYSICAL CHEMISTRY B no. 126, pages 6063 - 6073,
ISSN: 1520-6106
Language:
English
Publication year:
2022
Bibliographic description:
Dudek M., Kaczmarek-Kędziera A., Deska R., Trojnar J., Jasik P., Młynarz P., Samoć M., Matczyszyn K.: Linear and Nonlinear Optical Properties of Azobenzene Derivatives Modified with an (Amino)naphthalene Moiety// JOURNAL OF PHYSICAL CHEMISTRY B -Vol. 126,iss. 32 (2022), s.6063-6073
DOI:
Digital Object Identifier (open in new tab) 10.1021/acs.jpcb.2c03078
Sources of funding:
  • Free publication
Verified by:
Gdańsk University of Technology

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