Control of spin-spin exchange interactions in polynitroxides through inclusion within γ-cyclodextrin

Mintu Porel, M. Francesca Ottaviani, Steffen Jockusch, Nicholas J. Turro, Vaidhyanathan Ramamurthy

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Supramolecular interactions of polynitroxides with γ-cyclodextrin (γ-CD) were used to control intramolecular electron spin-spin exchange couplings in these stable radicals. In the absence of γ-CD, the binitroxide T2 and trinitroxide T3 showed strong spin-spin coupling as evidenced by the high exchange coupling constant of J = 120 MHz for T2 in its EPR spectra. Host/guest complexes are formed upon addition of γ-CD to the polynitroxides where the nitroxide moiety interacts with the γ-CD cavity, which causes suppression of spin exchange. By variation of the host/guest ratio, the nature of a trinitroxide spin system can be tuned from a three-spin to a two-spin to a one-spin system. In addition to the host/guest ratio, the spin exchange coupling can also be tuned by temperature, which shifts the equilibrium between CD-encapsulated nitroxides and free nitroxides.

Original languageEnglish
Pages (from-to)427-431
Number of pages5
JournalRSC Advances
Volume3
Issue number2
DOIs
StatePublished - Jan 14 2013

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Exchange coupling
Exchange interactions
Cyclodextrins
Paramagnetic resonance
Electrons
Temperature

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Control of spin-spin exchange interactions in polynitroxides through inclusion within γ-cyclodextrin. / Porel, Mintu; Ottaviani, M. Francesca; Jockusch, Steffen; Turro, Nicholas J.; Ramamurthy, Vaidhyanathan.

In: RSC Advances, Vol. 3, No. 2, 14.01.2013, p. 427-431.

Research output: Contribution to journalArticle

Porel, Mintu ; Ottaviani, M. Francesca ; Jockusch, Steffen ; Turro, Nicholas J. ; Ramamurthy, Vaidhyanathan. / Control of spin-spin exchange interactions in polynitroxides through inclusion within γ-cyclodextrin. In: RSC Advances. 2013 ; Vol. 3, No. 2. pp. 427-431.
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