Correction to: Nature Chemistry https://doi.org/10.1038/s41557-023-01211-3, published online 1 June 2023.

In the version of the article initially published, in Fig. 2b, compound nine was incorrect and the original and corrected compounds can be seen below in Fig. 2. Additionally, ref. 19 has now been amended to Wang. Q. et al. Hyperpolarized 89Y-EDTMP complex as a chemical shift-based NMR sensor for pH at the physiological range. J. Magn. Res. 320, 106837 (2020). These corrections have been made to the HTML and PDF versions of the article.

Fig. 1
figure 1

Original and corrected compound 9.