Single Bond Activated Aie of Pt(Ii) Complex Achieving Superfast Oxygen Sensing and High-Efficiency Felodipine Identification

Planar substituents such as carbazole possess excellent electronic characteristics and photoelectric properties. However, the undesirable ACQ phenomenon of luminogens is commonly triggered in solid and aggregation states by the modification of planar substituents, resulting in declined photophysical properties and degenerative device performances. Herein, an extraordinary AIE phenomenon of the Pt(II) complex PtPhenCz containing a planar carbazole group was found accidentally. The variation tendency of dipole moments and the planarity analysis of molecular fragments verified that the highly active rotation of the carbazole group caused by a single chemical bond activated the AIE of PtPhenCz. By the combination of AIE character and RTP nature of PtPhenCz, superfast quenching/recovery response of 5.1 s was demonstrated by the PtPhenCz/ethocel film, superior to the most advanced luminescent oxygen sensing devices. The AIE property of PtPhenCz efficaciously improved the oxygen sensitivity of ethocel films. AIE-active PtPhenCz demonstrated outstanding luminescent detection performance to antihypertensive felodipine. Spectral overlaps, noncovalent interaction analysis, and hole-electron population analysis indicated that the synergistic effect of resonance energy transfer and high-efficiency electron transfer resulted in the high detection efficiency. Noteworthily, selective visualization of felodipine under the interference of seven commonly used drugs was for the first time achieved by PtPhenCz.