Additions and corrections

Fluorinated paramagnetic chelates as potential multi-chromic ¹⁹F tracer agents

Zhong-Xing Jiang, Yue Feng and Yihua Bruce Yu

Chem. Commun., 2011, 47, 7233-7235 (DOI: 10.1039/c1cc11150g) Amendment published 29th September 2011

In our publication entitled "Fluorinated Paramagnetic Chelates as Potential Multi-chromic ¹⁹F Tracer Agents", the diamagnetic Bi³⁺ caused dramatic ¹⁹F relaxation time reduction. This prompted us to investigate this issue in detail. Using inductively coupled plasma mass spectrometry, we measured the metal content of each sample. It was found that each sample contains the right metal ion as expected, except the FC-Bi³⁺ sample, which contains 8% Gd³⁺ (relative to Bi³⁺). A new FC-Bi³⁺ sample without any paramagnetic ion contamination was then prepared. ¹⁹F NMR characterization leads to the following corrections: (¹⁹F) from -71.2 to -71.6 ppm; T₁ from 193 to 840 ms under N₂ and from 174 to 494 ms under O₂; T₂ from 33 to 113 ms under N₂ and from 33 to 110 ms under O₂. The corrected Figure 2 is given below. The result indicates that Bi³⁺ still causes significant relaxation time reduction compared to other diamagnetic ions, particularly T₂ reduction.

The Royal Society of Chemistry apologises for this error and any consequent inconvenience to authors and readers.

Back to article