dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Mandal, Sucharita |
dc.contributor.author |
Sigurdsson, Snorri |
dc.date.accessioned |
2020-08-11T15:28:16Z |
dc.date.available |
2020-08-11T15:28:16Z |
dc.date.issued |
2020-05-12 |
dc.identifier.citation |
Mandal, S., & Sigurdsson, S. T. (2020). On the limited stability of BDPA radicals. Chemistry - A European Journal, 26(33), 7486-7491. doi: 10.1002/chem.202001084 |
dc.identifier.issn |
0947-6539 |
dc.identifier.issn |
1521-3765 (eISSN) |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/1974 |
dc.description |
Post-print (lokagerð höfundar) |
dc.description.abstract |
1,3‐Bis(diphenylene)‐2‐phenylallyl (BDPA)‐based radicals are of interest as polarizing agents for dynamic nuclear polarization (DNP). For this purpose, a BDPA‐nitroxide biradical, employing a phosphodiester linkage, was synthesized. Contrary to what is commonly assumed, BDPA‐derived radicals were observed to have limited stability. Hence, the effects of various factors on the stability of BDPA radicals were investigated. Solvent polarity was found to play a significant role on degradation; a polar BDPA radical was observed to degrade faster in a non‐polar solvent, whereas non‐polar radicals were more unstable in polar solvents. The rate of decomposition was found to increase non‐linearly with increasing radical concentration; a 2‐fold increase in concentration led to a 3‐fold increase in the rate of degradation. Collectively, these results indicate that the dimerization is a significant degradation pathway for BDPA radicals and indeed, a dimer of one BDPA radical was detected by mass spectrometry. |
dc.description.sponsorship |
This work is funded by Icelandic Research Fund (163393-052) from the Icelandic Centre for Research (Rannis). We thank Dr. S. Jonsdottir for assistance with collection of the NMR and HRMS (ESI) data; Dr. Frederic Mentink-Vigier for help with simulations and for valuable suggestions; and members of the Sigurdsson research group for helpful discussions. |
dc.format.extent |
7486-7491 |
dc.language.iso |
en |
dc.publisher |
Wiley |
dc.relation.ispartofseries |
Chemistry – A European Journal;26(33) |
dc.rights |
info:eu-repo/semantics/embargoedAccess |
dc.subject |
BDPA |
dc.subject |
Dynamic nuclear polarization |
dc.subject |
EPR spectroscopy |
dc.subject |
Radical stability |
dc.subject |
Radicals |
dc.subject |
Kjarnsýrur |
dc.subject |
Litrófsgreining |
dc.subject |
Skautun (rafsegulfræði) |
dc.title |
On the Limited Stability of BDPA Radicals |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
This is the peer reviewed version of the following article: [Mandal, S., & Sigurdsson, S. T. (2020). On the limited stability of BDPA radicals. Chemistry - A European Journal, 26(33), 7486-7491. doi: 10.1002/chem.202001084], which has been published in final form at https://doi.org/10.1002/chem.202001084. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
dc.description.version |
Peer reviewed |
dc.identifier.journal |
Chemistry – A European Journal |
dc.identifier.doi |
10.1002/chem.202001084 |
dc.contributor.department |
Raunvísindadeild (HÍ) |
dc.contributor.department |
Faculty of Physical Sciences (UI) |
dc.contributor.department |
Raunvísindastofnun (HÍ) |
dc.contributor.department |
Science Institute (UI) |
dc.contributor.school |
Verkfræði- og náttúruvísindasvið (HÍ) |
dc.contributor.school |
School of Engineering and Natural Sciences (UI) |