Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 30, Pages 10732-10746Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp40282c
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Funding
- SNF [200021_121579]
- Higher Education Commission (HEC) of Pakistan
- University of York (Wild Fund)
- Swiss National Science Foundation (SNF) [200021_121579] Funding Source: Swiss National Science Foundation (SNF)
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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 Gd3+. Selective measurements of nitroxide-nitroxide, Gd3+-nitroxide and Gd3+-Gd3+ 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 Gd3+ 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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