Orientation selection in high-field RIDME and PELDOR experiments involving low-spin CoII ions

Angeliki Giannoulis, Claire Louise Motion, Maria Oranges, Michael Buehl, Graham Murray Smith, Bela E. Bode*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)
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Abstract

Orientation selective (OS) RIDME and PELDOR were conducted on a low-spin CoII complex coordinated by two nitroxide (NO) labelled 2,2':6',2''-terpyridine ligands. Co-NO RIDME at W- and Q-band gave insight into the relative orientation between the Co-NO interspin vector (rCo-NO) and the NO moiety. This was further supported by W-band Co-NO PELDOR that also allowed elucidating the relative orientation of the CoII and NO g-tensors. Differences to earlier predictions were confirmed by DFT calculations. Finally, NO-NO PELDOR allowed retrieving the mutual orientations between the NO-NO interspin vector (rNO-NO) and the NO moieties. The results demonstrate that OS-RIDME and -PELDOR can provide geometric and electronic structure information on a system containing a CoII ion and two nitroxides. Especially, the high sensitivity and ease of interpretation of RIDME at W-band opens avenues for new applications of CoII as orthogonal spin label.
Original languageEnglish
Pages (from-to)2151-2154
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number4
Early online date5 Jan 2018
DOIs
Publication statusPublished - 28 Jan 2018

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