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Relaxometric and luminescence behaviour of triaquahexaazamacrocyclic complexes, the gadolinium complex displaying a high relaxivity with a pronounced pH dependence

Abstract:
The relaxivity of [GdL1]3+ in aqueous solution has been studied as a function of temperature and magnetic field strength. The complex possesses a high relaxivity at pH 6 (12.8 mmol-1 s-1) that diminishes as successive water molecules are deprotonated, leading to a complex species whose relaxivity is typical of a purely outer-sphere complex. Measurements of the luminescence lifetime of a very similar complex, [YbL2]3+, in H2O and D2O were used to confirm that the complex possesses three bound waters at pH 5.5, but above pH 11 there are no bound OH groups in the putative di-oxo-bridged dimer.
Publication status:
Published

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Publisher copy:
10.1039/a709264d

Authors


More by this author
Institution:
University of Oxford
Division:
MPLS
Department:
Chemistry
Sub department:
Inorganic Chemistry
Role:
Author


Journal:
NEW JOURNAL OF CHEMISTRY More from this journal
Volume:
22
Issue:
6
Pages:
627-631
Publication date:
1998-06-01
DOI:
EISSN:
1369-9261
ISSN:
1144-0546


Language:
English
Pubs id:
pubs:46813
UUID:
uuid:15a96701-3a8f-403b-ae7f-e6d75e977b72
Local pid:
pubs:46813
Source identifiers:
46813
Deposit date:
2012-12-19

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