Quantitative imaging of magnetic field distribution using a pyrene-based magnetosensing exciplex fluorophore

Abstract

Py-12-O-2-DMA was used for a quantitative magnetic field imaging in mild conditions with 375 nm LED excitation. It was ca. 24.7 times brighter than a previously reported phenanthrene-based complex when excited by 355 nm excitation.

Peptoid-Conjugated Magnetic Field-Sensitive Exciplex System at High and Low Solvent Polarities

“…A photoexcited organic molecule can be deactivated by a quencher via electron transfer, yielding two quenching products: a transient emissive complex (exciplex) and a spin-correlated radical ion pair (RIP). , An external magnetic field ( B ) can modulate the exciplex emission (ExE), − which is known as one of the magnetic field effect (MFE) phenomena. − According to the radical pair mechanism − (Figure ), the modulation in ExE originates from the reduced intersystem crossing (ISC) rate between the 1 RIP and 3 RIP due to Zeeman splitting by B , and this step is an essential magnetic field-sensing step . The exciplex generated through (re)­association from the 1 RIP in the magnetic field-sensing step counts for the MFE ( 3B , Figure ).…”