Unexpectedly large change of water exchange rate and mechanism on [Ln(DTPA-BMA)(H{sub 2}O)] complexes along the lanthanide(III) series
- Univ. of Lausanne (Switzerland)
Water exchange on [Ln(DTPA-BMA)(H{sub 2}O)] (Ln = Nd, Eu, Tb, Dy, Ho; DTPA-BMA = diethylenetriaminepentaacetate-bis(methylamide)) was studied by {sup 17}O NMR spectroscopy. The water exchange rate was found to be (4-7 x 10{sup 5} s{sup {minus}1}) for Nd, Eu, and Gd, and jumps to 6.0 {plus_minus} 0.3 x 10{sup 6} s{sup {minus}1} for Ho, indicating a shift in mechanism. Reaction activation volumes were determined. Uses of these compounds as MRI contrast agents was discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 508707
- Journal Information:
- Inorganic Chemistry, Vol. 34, Issue 17; Other Information: PBD: 16 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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