The polynitrogen-containing cation transporters 1–4 are shown by electrospray mass spectrometry to form multi-cationic species. In the absence of Na+, protonated species dominate but increasing the sodium concentration leads to all binding sites being occupied.
Evidence for multiple alkali metal cation complexation in membrane-spanning ion transporters
H. Shabany, C. L. Murray, C. A. Gloeckner, M. A. Grayson, M. L. Gross and G. W. Gokel, Chem. Commun., 2000, 2375 DOI: 10.1039/B005442I
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