Smart‐Responsive HOF Heterostructures with Multiple Spatial‐Resolved Emission Modes toward Photonic Security Platform

Abstract

Luminescent hydrogen‐bonded organic frameworks (HOFs) with the unique dynamics and versatile functional sites hold great potential application in information security, yet most of responsive HOFs focus on the single‐component framework with restrained emission control, limiting further applications in advanced confidential information protection. Herein, we report the first smart‐responsive HOF heterostructure with multiple spatial‐resolved emission modes for covert photonic security platform. The HOF heterostructures are prepared by integrating different HOFs into a single microwire based on a hydrogen‐bond‐assisted epitaxial growth method. The distinct responsive behaviors of HOFs permit the heterostructure to simultaneously display the thermochromism via the framework transformation and the acidichromism via the protonation effect, thus generating multiple emission modes. The dual stimuli‐controlled spatial‐resolved emissive modes constitute the fingerprint of a heterostructure, and enable the establishment of the smart responsive photonic barcode with multiple convert states, which further demonstrate the dynamic coding capability and enhanced security in anti‐counterfeiting label application. These results offer a promising route to design function‐oriented smart responsive HOF micro‐devices towards advanced anticounterfeiting applications.This article is protected by copyright. All rights reserved

Anionic Hydrogen‐Bonded Frameworks Showing Tautomerism and Colorful Luminescence for the Ultrasensitive Detection of Acetone

“…Then BA-N can be easily obtained by a trimerization reaction of TFMABr in water. The structure of BA-N was confirmed by 1 H NMR, 13 C NMR and 19 F NMR in deuterated DMSO (Figure S1-S3). Possible mechanism of the trimerization reaction of TFMABr has been proposed and shown in Scheme S1.…”

“…[12] Zhang et al reported the first intelligent HOF heterostructure with multiple spatially resolved emission modes for covert photonic security platforms. [13] Chi et al developed a flexible HOF that can dynamically adjust pore size to accommodate guest molecules of different sizes in response to external stimuli. [14] However, the current response of HOFs to external environmental stimuli is limited to the phase transitions such as the opening and closing of their pores.…”

Photoluminescent organic crystals and co-crystals

“…HOFs are more versatile due to their soft and adjustable pores, and together with other applications, have been utilized for the development of luminescent hosts. [160][161][162][163][164] H. Wang et al utilized the tetrahedrally functionalized AIE skeleton of TPE-tetra(amidinium) ions TPE 4+ for the development of periodic porous and fluorescent HOFs with a range of dicarboxylic acids including 2TP, 2BPY, 2BPH and 2TPh. Interestingly, the resultant HOFs were blue emitting with finely tuned emission wavelengths ranging between 453-487 nm and quantum yields of 4.6-3.6%.…”