Probing electronic communication in stable benzene-bridged verdazyl diradicals.

Probing electronic communication in stable benzene-bridged verdazyl diradicals. Research Abstract Details 

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Probing electronic communication in stable benzene-bridged verdazyl diradicals. Abstract Text:

Joe B Gilroy,Steve D J McKinnon,Pierre Kennepohl,Mark S Zsombor,Michael J Ferguson,Laurence K Thompson,Robin G Hicks,Joe B Gilroy,Steve D J McKinnon,Pierre Kennepohl,Mark S Zsombor,Michael J Ferguson,Laurence K Thompson,Robin G Hicks,Joe B Gilroy,Steve D J McKinnon,Pierre Kennepohl,Mark S Zsombor,Michael J Ferguson,Laurence K Thompson,Robin G Hicks,

Two benzene-bridged N,N'-bis(isopropyl)6-oxoverdazyl diradicals 7a (1,4-benzene-bridged) and 7b (1,3-benzene-bridged) were prepared and studied by an array of physicochemical techniques aimed at elucidating the intramolecular electronic and magnetic coupling between verdazyl chromophores. The very high stability of these diradicals permits comprehensive investigations of their properties for the first time. The UV-vis spectra suggest negligible direct conjugative overlap involving the radical SOMOs, although significant differences in higher energy absorptions suggest that radical orbitals other than the SOMO are likely communicating via the central p-phenylene bridge in 7a. The electrochemical features of the two diradicals are nearly identical; in each derivative, both radicals are oxidized essentially independently while the reductions occur in a stepwise manner with differences of approximately 100 mV between the two reductions. EPR and magnetic susceptibility collectively indicate that the para-bridged diradical is weakly antiferromagnetically coupled while the meta analogue is weakly ferromagnetically coupled, in accord with the topology of the substitution pattern on the central benzene ring.

Probing electronic communication in stable benzene-bridged verdazyl diradicals. Publishing Authors By Initials

JB Gilroy,SD McKinnon,P Kennepohl,MS Zsombor,MJ Ferguson,LK Thompson,RG Hicks,JB Gilroy,SD McKinnon,P Kennepohl,MS Zsombor,MJ Ferguson,LK Thompson,RG Hicks,JB Gilroy,SD McKinnon,P Kennepohl,MS Zsombor,MJ Ferguson,LK Thompson,RG Hicks,

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Probing electronic communication in stable benzene-bridged verdazyl diradicals. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of organic chemistry

VOLUME: 72

Page Numbers: 8062-9

Journal Abbreviation: J. Org. Chem.

ISSN: 0022-3263

DAY: 21

MONTH: 09

YEAR: 2007

Probing electronic communication in stable benzene-bridged verdazyl diradicals. Information

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LANGUAGE: eng

NlmUniqueID: 2985193

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Grant and Affiliation Information for Probing electronic communication in stable benzene-bridged verdazyl diradicals.

AFFILIATION: Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6.

Country: United States

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MEDLINETA: J Org Chem

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