Opin vísindi

On the Limited Stability of BDPA Radicals

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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)

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