Journal
INORGANIC CHEMISTRY
Volume 61, Issue 1, Pages 713-722Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c03527
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- STC-IISc
- UGC-India
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The development of a new tetraimidazolium salt based on triphenylamine for the synthesis of tetranuclear silver(I) octacarbene metallacage showed a nine-fold emission enhancement in dilute solution, making it a potential candidate for picric acid recognition. The enhanced emission intensity and the presence of the triphenylamine core resulted in a considerable detection limit toward picric acid, highlighting the potential of using metal-carbene bond-directed rigidification-induced enhanced emission for sensing applications.
A new triphenylamine-based tetraimidazolium salt L was developed for silver(I)-carbene bond-directed synthesis of tetranuclear silver(I) octacarbene ([Ag-4(L)(2)](PF6)(4)) metallacage 1. Interestingly, after assembly formation, metallacage 1 showed a nine-fold emission enhancement in dilute solution while ligand L was weakly fluorescent. This is attributed to the rigidity induced to the system by metal-carbene bond formation where the metal center acts as a rigidification unit. The enhanced emission intensity in dilute solution and the presence of the triphenylamine core made 1 a potential candidate for recognition of picric acid (PA). This recognition can be ascribed to the dual effect of ground-state charge-transfer complex formation and resonance energy transfer between the picrate and metallacage 1. For metallacage 1, a considerable detection limit toward PA was observed. The use of such metal-carbene bond-directed rigidification-induced enhanced emission for PA sensing is noteworthy.
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