RIDME Spectroscopy with Gd(III) Centers

RIDME Spectroscopy with Gd(III) Centers

The relaxation induced dipolar modulation enhancement (RIDME) technique is applied at W-band microwave frequencies around 94 GHz to a pair of Gd­(III) complexes that are connected by a rodlike spacer, and the extraction of the interspin distance distribution is discussed. A dipolar pattern derived f...

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Veröffentlicht in:The journal of physical chemistry letters 2014-11, Vol.5 (22), p.3970-3975
Hauptverfasser: Razzaghi, Sahand, Qi, Mian, Nalepa, Anna I, Godt, Adelheid, Jeschke, Gunnar, Savitsky, Anton, Yulikov, Maxim
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Biophysical Chemistry and Biomolecules
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container_end_page 3975
container_issue 22
container_start_page 3970
container_title The journal of physical chemistry letters
container_volume 5
creator Razzaghi, Sahand
Qi, Mian
Nalepa, Anna I
Godt, Adelheid
Jeschke, Gunnar
Savitsky, Anton
Yulikov, Maxim
description The relaxation induced dipolar modulation enhancement (RIDME) technique is applied at W-band microwave frequencies around 94 GHz to a pair of Gd­(III) complexes that are connected by a rodlike spacer, and the extraction of the interspin distance distribution is discussed. A dipolar pattern derived from RIDME experimental data is a superposition of Pake-like dipolar patterns corresponding to the fundamental dipolar interaction and higher harmonics thereof. Intriguingly, the relative weights of the stretched patterns do not depend significantly on mixing time. As much larger modulation depths can be achieved than in double electron–electron resonance distance measurements at the same frequency, Gd­(III)–Gd­(III) RIDME may become attractive for structural characterization of biomacromolecules and biomolecular complexes.
doi_str_mv 10.1021/jz502129t
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title RIDME Spectroscopy with Gd(III) Centers
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