AI Article Synopsis
- Trityl-based spin labels are being studied as alternatives to nitroxides for measuring distances at the nanometer scale using electron paramagnetic resonance (EPR) methods.
- Researchers synthesized model compounds with specific interspin distances to investigate the impact of spin density delocalization and dipolar coupling on distance measurements.
- Analysis of EPR data revealed that compounds with distances up to 25 Å show strong coupling, and accurate distance determinations require considering both spin density delocalization and pseudo-secular dipolar coupling effects.
Article Abstract
Trityl based spin labels are emerging as a complement to nitroxides in nanometer distance measurements using EPR methods. The narrow spectral width of the trityl radicals prompts us to ask the question at which distance between these spin centers, the pseudo-secular part of the dipolar coupling and spin density delocalization have to be taken into account. For this, two trityl-trityl and one trityl-nitroxide model compounds were synthesized with well-defined interspin distances. Continuous wave (CW) EPR, double quantum coherence (DQC) and pulsed electron-electron double resonance (PELDOR) spectra were acquired from these compounds at commercial X-band frequencies. The data analysis shows that two of the compounds, with distances of up to 25 Å, fall into the strong coupling regime and that precise distances can only be obtained if both the spin density delocalization and the pseudo-secular part of the dipolar coupling are included in the analysis.
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| http://dx.doi.org/10.1039/c3cp52789a | DOI Listing |
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