A Sequential Dual-Lock Strategy for Photoactivatable Chemiluminescent Probes Enabling Bright Duplex Optical Imaging.

Chemiluminescence (CL)-based technologies have revolutionized in vivo monitoring of biomolecules. However, significant technical hurdles have limited the achievement of trigger-controlled, bright, and enriched CL signal. Herein, a dual-lock strategy uses sequence-dependent triggers for bright optical imaging with real-time fluorescent signal and ultra-sensitive CL signal. These probes can obtain an analyte-triggered accumulation of stable pre-chemiluminophore with aggregation-induced emission (AIE), and then the pre-chemiluminophore exhibits a rapid photooxidation process (1,2-dioxetane generation) by TICT-based free-radical addition, thereby achieving an enrichment and bright CL signal. The dual-lock strategy expands the in vivo toolbox for highly accurate analysis and has for the first time allowed access to accurately sense and trace biomolecules with high-resolution, dual-mode of chemo-fluoro-luminescence, and three-dimensional (3D) imaging in living animals.