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Comparative NMR Relaxivity Study of Polyoxometalate-Based Clusters [Mn$_{4}$(H$_{2}$O)$_{2}$(P$_{2}$W$_{1S}$O$_{56}$)$_{2}$]$^{16-}$ and [{Dy(H$_{2}$O)$_{6}$}$_{2}$Mn$_{4}$(H$_{2}$O)$_{2}$(P$_{2}$W$_{15}$O$_{56}$)$_{2}$]$^{10-}$ from 20 MHz to 1.2 GHz

Ibrahim, Masooma; Rudszuck, Thomas; Kerdi, Banan; Krämer, Steffen; Guthausen, Gisela; Powell, Annie K.

Nuclear Magnetic Resonance relaxivities are a measure for the sensitivity of a contrast agent (CA), i.e. the potential of a paramagnetic moiety to enhance longitudinal and transverse relaxation of molecules in its near neighbourhood. The underlying mechanism is called Paramagnetic Relaxation Enhancement (PRE). The relaxivity, characterizing PRE, depends not only on the external applied magnetic field but also depends on numerous factors, such as number of coordinated water molecules, water exchange rate, rotational diffusion, first and second coordination hydration sphere, electronic and magnetic properties of paramagnetic centers and the molecular shape/size of the CA. Relaxation rates are usually normalized to the concentration of the contrast agent to provide the relaxivities. To investigate the influence of these factors on PRE of newly synthesized potential CA, two paramagnetic metals containing polyoxometalates (POMs) [Mn$_{4}$(H$_{2}$O)$_{2}$(P$_{2}$W$_{15}$O$_{56}$)$_{2}$]$^{16-}$ (Mn$_{4-}$P$_{2}$W$_{15}$) and [{Dy(H$_{2}$O)$_{6}$}$_{2}$Mn$_{4}$(H$_{2}$O)$_{2}$(P$_{2}$W$_{15}$O$_{56}$)$_{2}$]$^{10-}$ (Dy$_{2}$Mn$_{4}$-P$_{2}$W$_{15}$) were selected as models to be studied at $^{1}$H Larmor frequencies from 20 MHz to 1.2 GHz. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125378
Veröffentlicht am 28.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Anorganische Chemie (AOC)
Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0937-9347, 1613-7507
KITopen-ID: 1000125378
Erschienen in Applied magnetic resonance
Vorab online veröffentlicht am 08.10.2020
Nachgewiesen in Scopus
Web of Science
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