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Abstract
An anisolyl-picolinate antenna grafted onto different macrocyclic ligands such as tacn, pyclen or cyclen renders the resulting terbium (III) complexes highly sensitive towards oxygen in aqueous solutions, enabling the design of ratiometric or lifetime-based molecular sensors. The underlying sensitization mechanism was investigated on analogous Gd(III) complexes and the oxygen sensitivity was studied using transient absorption spectroscopy. The antenna-based triplet lifetime increased up to 900-fold upon degassing, underscoring the role of the ligand excited states in designing highly sensitive oxygen probes.
Supplementary materials
Title
Supporting information
Description
Experimental section contains characterization of all new ligands and related complexes and air-equilibrated TAS data.
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