Abada, SabahLecointre, AlexandreElhabiri, MouradEsteban-Gomez, DavidPlatas-Iglesias, CarlosTallec, GaylordMazzanti, MarinellaCharbonniere, Loic J.2014-11-072014-11-072014-11-07201210.1039/c2cc30757jhttps://infoscience.epfl.ch/handle/20.500.14299/108420WOS:000302017000015A Gd complex based on a polyphosphonated pyridyl ligand shows a very high stability in aqueous solution (logK EuL = 25.7), a high relaxivity (8.5 mM -1 s -1 at 25 °C and 20 MHz) and a marked and selective relaxivity enhancement (37%) in the presence of Mg 2+, opening interesting perspectives for the design of cation responsive contrast agents. © 2012 The Royal Society of Chemistry.text::journal::journal article::research article