Tunable Mechanoresponsive Self‐Assembly of an Amide‐Linked Dyad with Dual Sensitivity of Photochromism and Mechanochromism. (30th May 2017)

• Record Type: Journal Article
• Authors: Mo, Shenzhong; Meng, Qingting; Wan, Shulin; Su, Zhiqiang; Yan, Hong; Tang, Ben Zhong; Yin, Meizhen
• Is Part Of: Advanced functional materials. Volume 27:Number 28(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-05-30
• Subjects: dual sensitivity -- luminescent materials -- mechanoresponsive materials -- self‐assembly; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201701210
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : Photo‐ and mechanoluminescent materials that exhibit tunable emission properties when subjected to external stimuli have a wide variety of applications. However, most mechanoresponsive materials have a mechano‐induced structural transition from crystalline to amorphous phase, and there are only few reports on the crystalline to crystalline transformation. This study reports an amide‐linked dyadP1 containing spiropyran and naphthalimide chromophores with dual sensitivity of photochromism and mechanochromism. Under light and mechanical stimuli, P1 performs different color transition. With mechanical force, the morphologies ofP1 change from microfiber to nanosphere and the amide group inP1 plays a vital role in these transition processes. Mechanical force can induce the morphology change ofP1 through enhancing π–π stacking and destroying hydrogen bonds. These results demonstrate the feasibility of the design strategy for new mechanoresponsive switching materials: both π−π stacking and hydrogen bonding of the dyad contribute the mechano‐induced crystalline/crystalline transformation. Abstract : An amide‐linked dyad with dual sensitivity of photochromism and mechanochromism is a tunable self‐assembly mechanochromic material with self‐assembled morphology that can be switched from fibrillar to a spherical nanostructure, accompanied with tricolor transformation, under grinding.