A europium(III) DOTA-tetraamide complex was designed as a MRI sensor of singlet oxygen ((1)O2). The water soluble, thermodynamically stable complex reacts rapidly with (1)O2 to form an endoperoxide derivative that results in an ∼3 ppm shift in the position of the Eu(III)-bound water chemical exchange saturation transfer (CEST) peak. The potential of using this probe to detect accumulation of the endoperoxide derivative in biological media by ratiometric CEST imaging was demonstrated.
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| http://dx.doi.org/10.1039/c3dt50194a | DOI Listing |
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