Orientation selection in high-field RIDME and PELDOR experiments involving low-spin CoII ions
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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.
Giannoulis , A , Motion , C L , Oranges , M , Buehl , M , Smith , G M & Bode , B E 2018 , ' Orientation selection in high-field RIDME and PELDOR experiments involving low-spin Co II ions ' , Physical Chemistry Chemical Physics , vol. 20 , no. 4 , pp. 2151-2154 . https://doi.org/10.1039/C7CP07248A
Physical Chemistry Chemical Physics
© 2018, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/C7CP07248A
DescriptionAG and CLM were supported by postgraduate fellowships by the EPSRC-funded doctoral training centre ‘integrated magnetic resonance’. This work was supported by the European Union Seventh Framework Programme (PCIG12-GA-2012-334496). The W-band instrument was developed under the U.K. Research Councils Basic Technology Program (grant EP/F039034/1) and the Q-band equipment is supported by the Wellcome Trust (099149/Z/12/Z).
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