Designing one-dimensional covalent organic frameworks: novel post-synthetic modification on hydroxyl groups and ratiometric detection of chemical warfare agent mimics

A post-synthetic modification based on substitution reaction of the hydroxyl group in COFs is utilized to construct a dual-emission hybrid material for real-time detection of 2-chloroethyl ethyl sulfide (2-CEES) and diethyl cyanophosphonate (DCNP), mimics of chemical warfare agents.