Aggregation-induced ratiometric emission and mechanochromic luminescence in a pyrene-benzohydrazonate conjugate. (29th June 2018)

• Record Type: Journal Article
• Authors: Li, Yao; Huang, Wei; Yong, Juan; Huang, Shuaidan; Li, Yujie; Liu, Yang; Wu, Dayu
• Is Part Of: New journal of chemistry. Volume 42:Number 15(2018)
• Page Start: 12644
• Page End: 12648
• Publication Date: 2018-06-29
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj01379a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A structure tunable pyrene benzohydrazonate-based molecular platform exhibits a drastic aggregation-induced color change and a high solid-state quantum yield. Abstract : Luminogenic materials with aggregation-induced emission (AIE) have recently aroused great attention due to their potential application in many fields. However, aggregation induced ratiometric luminescence in addition to emission turn-on has been scarcely studied. Here, a structure tunable pyrene benzohydrazonate-based molecular platform exhibits a drastic aggregation-induced color change (Δ λ em, max ∼ 130 nm) and a high solid-state quantum yield (QYmax ∼ 54.5%). The exciting switch behaviour is triggered by intermolecular hydrogen-bonding through the carbohydrozone bridge, which leads to fixation of the molecular conformations. In addition, by virtue of the multiple excimer state of the pyrenyl unit, a broad range of carbohydrozone-based materials with high contrast mechanochromic luminescence have been developed. These systems represent stimuli-responsive optoelectronic switching devices leading toward multistate dynamic molecular systems in both solution and the solid state.