The highest water exchange rate ever measured for a Gd(iii) chelate†
Abstract
The complex [Gd(L)(H2O)]3− (H6L = N,N′-bis(6-carboxy-2-pyridylmethyl)ethylenediamine-N,N′-methylenephosphonic acid) displays the highest water exchange rate ever measured for a Gd(III) chelate (k298ex = 8.8 × 108 s−1), which is attributed to the flexibility of the metal coordination environment.