Abstract
This paper synthesized a series of diamine ligands with different conjugation chains and their corresponding Re(I) complexes for oxygen sensing purpose. It was anticipated that these conjugation chains might increase sensing collision probability and thus improve sensing performance. These Re(I) complexes were characterized in detail, including their single crystal structures, electronic transitions, absorption and emission spectra, emission lifetimes and yields. By doping them into a silica substrate MCM-41, their emission response to various O2 concentrations was analyzed. A maximum emission intensity ratio of 8.17 was obtained with short response time of 7s. The correlation between sensing performance and probe structure was discussed tentatively. We finally came to a conclusion that excited state lifetime was a major factor controlling sensitivity. While electron distribution effect on sensitivity was limited.
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