Distinct Mechanoresponsive Luminescence, Thermochromism, Vapochromism, and Chlorine Gas Sensing by a Solid-State Organic Emitter.

ABSTRACT: In this study, we report a synthetically simple donor-acceptor (D-A)-type organic solid-state emitter 1 that displays unique fluorescence switching under mechanical stimuli. Orange and yellow emissive crystals of 1 (1O, 1Y) exhibit an unusual "back and forth" fluorescence response to mechanical force. Gentle crushing (mild pressure) of the orange or yellow emissive crystal results in hypsochromic shift to cyan emissive fragments (λ_em = 498-501 nm) with a large wavelength shift Δλ_em = -71 to -96 nm, while further grinding results in bathochromic swing to green emissive powder λ_em = 540-550 nm, Δλ_em = +40 to 58 nm. Single-crystal X-ray diffraction study reveals that molecules are packed by weak interactions, such as C-H·

SUBMITTER: Adak A 

PROVIDER: S-EPMC6641972 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature