A Novel Ratiometric Oxygen Sensor Based On a Sextuple Hydrogen‐Bonding Self‐Assembly Molecular Heterodimer

A novel sextuple hydrogen‐bonding (HB) self‐assembly molecular heterodimer bearing an iridium complex as the indicator dye and two carbazoles as the reference dye, namely 6HB‐Irbt‐Cz , was synthesized, and its molecular structure was confirmed by ¹H NMR, ¹³CNMR, TOF‐MS and 2D NMR. Because of the inefficient energy transfer process between the carbazole and iridium complex units, 6HB‐Irbt‐Cz exhibits distinct ?uorescence/phosphorescence dual emission in neat film state. More importantly, the neat film sample of 6HB‐Irbt‐Cz could display linear ratiometric optical response toward oxygen in the full oxygen concentration range from 0 to 100 vol%, together with good stability, reversibility and rapid response‐recovery times. Note that this represents the first discovery of neat‐film‐based oxygen sensor capable of showing strictly linear ratiometric Stern‐Volmer behavior in the oxygen concentration of 0–100 vol%.