Meta-Connected Oligo-Azobenzenes Outperform Their Para Counterparts.

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Tác giả: Leon Kambiz Paschai Darian, Andreas Dreuw, Nils Oberhof

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: Germany : Chemphyschem : a European journal of chemical physics and physical chemistry , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 159621

Systems with multiple photoswitchable units in one molecule have attracted considerable attention in the past years as they are useful for a broad variety of possible applications. Especially, linked azobenzenes sharing one benzene ring are of high interest since their direct linkage introduces an additional photoswitchable unit at only small increase in molecular weight. In this spirit, linear oligo-azobenzenes had been synthesized, though their photochemical properties have only been investigated for short chain lengths. In this study, we use (time-dependent) density functional methodology for the evaluation of the excitations of meta- and para-connected oligo-azobenzenes to predict their switching ability. It becomes apparent, that the meta connection pattern enables each azobenzene subunit to act as an individual switchable unit, whereas they are strongly coupled and loose their individuality in para connection. Therefore, meta-oligo-azobenzenes are ideal candidates for future studies of azobenzene-based functional polymers, while para-oligo-azobenzenes are not.
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