A new aza-15-crown-5 ether-appended iridium complex was synthesized and showed promising on-off selective emission-triggering by inhibition of photoinduced electron transfer (PET) upon binding of Mg(2+).

Highly efficient immobilized catalysts for continuous‐flow cross‐coupling reactions that show better productivity than those for the corresponding batch reactions are increasingly in demand. For practical use, such catalysts should have highly catalytic activity and high leaching resistance. To find catalysts suitable for continuous‐flow conditions, we have developed a consistent method for evaluating the catalytic performance of commercially available immobilized Pd catalysts. Monitoring of the change in turnover frequency over time under excess substrate loading conditions revealed the limitation of these catalysts. On the basis of the evaluation results, we have successfully developed a new immobilized Pd catalyst that exhibited highly efficient and robust catalytic performance.