Crystallization-Induced Red Phosphorescence and Grinding-Induced Blue-Shifted Emission of a Benzobis(1,2,5-thiadiazole)-Thiophene Conjugate.

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ID: 71680
2019
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Abstract
Mechanochromic luminogens are of significant importance in both academic and technical aspects. Thus far, most mechanochromic compounds exhibit bathochromically shifted emission upon grinding; the examples of those that exhibit blue-shifted emission still remain limited. Herein, a donor-acceptor-donor (D-A-D)-structured conjugate, namely 4,7-di(2-thienyl)-2,1,3-benzothiadiazole (DTBT), comprising benzobis(1,2,5-thiadiazole) and thiophene units, has been carefully synthesized and investigated. DTBT exhibits typical intramolecular charge transfer (ICT) characteristics, crystallization-induced phosphorescence (CIP), and remarkable mechanochromism. Although it merely emits fluorescence in solutions with distinct ICT features, its crystals demonstrate bright-red room-temperature phosphorescence (616 nm) with efficiency up to 25.0% and generate yellow excimer fluorescence (578 nm) upon mechanical grinding, accompanying decreased lifetimes from 10.9 μs to 3.5 ns and a blue-shifted emission of 38 nm. These results highly indicate the feasibility to fabricate novel CIP luminogens with blue-shifted mechanochromism.
Reference Key
he2019crystallizationinducedacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors He, Gang;Du, Linlin;Gong, Yongyang;Liu, Yuanli;Yu, Chuanbai;Wei, Chun;Yuan, Wang Zhang;
Journal ACS omega
Year 2019
DOI
10.1021/acsomega.8b02805
URL
Keywords
copper luminescence aggregation cluster compounds phosphorescence

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