Magnetic alignment and quadrupolar/paramagnetic cross-correlation in complexes of Na with LnDOTP 5-

Uzi Eliav, S. Chandra Shekar, Wen Ling, Gil Navon, Alexej Jerschow

Research output: Contribution to journalArticle

Abstract

The observation of a double-quantum filtered signal of quadrupolar nuclei (e.g. 23Na) in solution has been traditionally interpreted as a sign for anisotropic reorientational motion. Ling and Jerschow (2007) [23] have found that a 23Na double-quantum signal is observed also in solutions of TmDOTPNa 5. Interference effects between the quadrupolar and the paramagnetic interactions have been reported to lead to the appearance of double-quantum coherences even in the absence of a residual quadrupolar interaction. In addition, such processes lead to differential linebroadening effects between the satellite transitions, akin to effects that are well known for dipolar-CSA cross-correlation. Here, we report experiments on sodium in the presence of LnDOTP compounds, where it is shown that these cross-correlation effects correlate well with the pseudo-contact shift. In addition, anisotropic g-values of the lanthanide compounds in question, can also lead to alignment within the magnetic field, and consequently to the appearance of line splitting and double-quantum coherences. The two competing effects are demonstrated and it is concluded that both cross-correlated relaxation and alignment in the magnetic field must be at work in the systems described here.

Original languageEnglish (US)
Pages (from-to)114-120
Number of pages7
JournalJournal of Magnetic Resonance
Volume216
DOIs
StatePublished - Mar 2012

Keywords

  • Alignment of lanthanide complexes
  • Cross-correlated relaxation
  • LnDOTP
  • Mulitple-quantum coherences
  • Na lanthanide shift reagents
  • Paramagnetic interaction
  • Pseudocontact shifts
  • Quadrupolar coupling

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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