By the same authors

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Distance measurements in Au nanoparticles functionalized with nitroxide radicals and Gd3+ -DTPA chelate complexes

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Published copy (DOI)

Author(s)

  • M. Yulikov
  • P. Lueders
  • M. Farooq Warsi
  • V. Chechik
  • G. Jeschke

Department/unit(s)

Publication details

JournalPhysical Chemistry Chemical Physics
DateE-pub ahead of print - 24 May 2012
DatePublished (current) - Aug 2012
Issue number30
Volume14
Number of pages15
Pages (from-to)10732-10746
Early online date24/05/12
Original languageEnglish

Abstract

Nanosized gold particles were functionalised with two types of paramagnetic surface tags, one having a nitroxide radical and the other one carrying a DTPA complex loaded with Gd . Selective measurements of nitroxide-nitroxide, Gd -nitroxide and Gd -Gd distances were performed on this system and information on the distance distribution in the three types of spin pairs was obtained. A numerical analysis of the dipolar frequency distributions is presented for Gd centres with moderate magnitudes of zero-field splitting, in the range of detection frequencies and resonance fields where the high-field approximation is only roughly valid. The dipolar frequency analysis confirms the applicability of DEER for distance measurements in such complexes and gives an estimate for the magnitudes of possible systematic errors due to the non-ideality of the measurement of the dipole-dipole interaction.

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