A diamine ligand with long “arms” and its corresponding dinuclear rhenium(I) complex: Synthesis, characterization, photophysical property, and sensing activity towards molecular oxygen

► A ligand with two long alkyl chain arms serving as a shield is synthesized. ► The shield protects the excited state emissive center. ► The emission of Re(I) complex is immune towards surrounding interference. ► A high sensitivity of 20.1 is realized.