Single crystal electron paramagnetic resonance spectra of triplet excitons in [(Cp*Ru)2(η6,η6-[2 2](1,4)cyclophane)2+][(TCNQ)4 2-]

John R. Morton, Keith F. Preston, Michael Ward, Paul J. Fagan

Research output: Contribution to journalArticle

Abstract

Single crystals of [(Cp*Ru)26, η6-[22](1,4)cyclophane)2+][(TCNQ) 4 2-] (Cp* = η5-C5Me 5, TCNQ = tetracyanoquinodimethane) have been examined by EPR spectroscopy at temperatures down to 4 K. The anisotropic spectrum measured in the 77-150 K range is characteristic of an excitonic triplet species (I). This behavior is attributed to interactions between electrons located in one of the TCNQ acceptor stacks present in the title compound. The direction of maximum electronic interaction coincides with the stacking axis of the crystals (the crystallographic a axis). Intensity measurements establish that I is a thermally excited triplet with a J = 560 ± 30 cm-1, exhibiting zero field splittings of \D\ = 187 MHz (66G) and \E\ = 32 MHz (10 G). A second although weaker feature in the spectrum is tentatively assigned to a second triplet (species II) having very much smaller values of \D| and J than those of I. Species II is attributed to an impurity present in very low concentrations.

Original languageEnglish (US)
Pages (from-to)2148-2153
Number of pages6
JournalThe Journal of chemical physics
Volume90
Issue number4
StatePublished - 1989

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Paramagnetic resonance
electron paramagnetic resonance
excitons
Single crystals
single crystals
low concentrations
interactions
impurities
electronics
spectroscopy
crystals
electrons
Spectroscopy
Impurities
Crystals
temperature
cyclophane 2
LDS 751
tetracyanoquinodimethane
Electrons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Single crystal electron paramagnetic resonance spectra of triplet excitons in [(Cp*Ru)2(η6,η6-[2 2](1,4)cyclophane)2+][(TCNQ)4 2-]. / Morton, John R.; Preston, Keith F.; Ward, Michael; Fagan, Paul J.

In: The Journal of chemical physics, Vol. 90, No. 4, 1989, p. 2148-2153.

Research output: Contribution to journalArticle

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abstract = "Single crystals of [(Cp*Ru)2(η6, η6-[22](1,4)cyclophane)2+][(TCNQ) 4 2-] (Cp* = η5-C5Me 5, TCNQ = tetracyanoquinodimethane) have been examined by EPR spectroscopy at temperatures down to 4 K. The anisotropic spectrum measured in the 77-150 K range is characteristic of an excitonic triplet species (I). This behavior is attributed to interactions between electrons located in one of the TCNQ acceptor stacks present in the title compound. The direction of maximum electronic interaction coincides with the stacking axis of the crystals (the crystallographic a axis). Intensity measurements establish that I is a thermally excited triplet with a J = 560 ± 30 cm-1, exhibiting zero field splittings of \D\ = 187 MHz (66G) and \E\ = 32 MHz (10 G). A second although weaker feature in the spectrum is tentatively assigned to a second triplet (species II) having very much smaller values of \D| and J than those of I. Species II is attributed to an impurity present in very low concentrations.",
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T1 - Single crystal electron paramagnetic resonance spectra of triplet excitons in [(Cp*Ru)2(η6,η6-[2 2](1,4)cyclophane)2+][(TCNQ)4 2-]

AU - Morton, John R.

AU - Preston, Keith F.

AU - Ward, Michael

AU - Fagan, Paul J.

PY - 1989

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N2 - Single crystals of [(Cp*Ru)2(η6, η6-[22](1,4)cyclophane)2+][(TCNQ) 4 2-] (Cp* = η5-C5Me 5, TCNQ = tetracyanoquinodimethane) have been examined by EPR spectroscopy at temperatures down to 4 K. The anisotropic spectrum measured in the 77-150 K range is characteristic of an excitonic triplet species (I). This behavior is attributed to interactions between electrons located in one of the TCNQ acceptor stacks present in the title compound. The direction of maximum electronic interaction coincides with the stacking axis of the crystals (the crystallographic a axis). Intensity measurements establish that I is a thermally excited triplet with a J = 560 ± 30 cm-1, exhibiting zero field splittings of \D\ = 187 MHz (66G) and \E\ = 32 MHz (10 G). A second although weaker feature in the spectrum is tentatively assigned to a second triplet (species II) having very much smaller values of \D| and J than those of I. Species II is attributed to an impurity present in very low concentrations.

AB - Single crystals of [(Cp*Ru)2(η6, η6-[22](1,4)cyclophane)2+][(TCNQ) 4 2-] (Cp* = η5-C5Me 5, TCNQ = tetracyanoquinodimethane) have been examined by EPR spectroscopy at temperatures down to 4 K. The anisotropic spectrum measured in the 77-150 K range is characteristic of an excitonic triplet species (I). This behavior is attributed to interactions between electrons located in one of the TCNQ acceptor stacks present in the title compound. The direction of maximum electronic interaction coincides with the stacking axis of the crystals (the crystallographic a axis). Intensity measurements establish that I is a thermally excited triplet with a J = 560 ± 30 cm-1, exhibiting zero field splittings of \D\ = 187 MHz (66G) and \E\ = 32 MHz (10 G). A second although weaker feature in the spectrum is tentatively assigned to a second triplet (species II) having very much smaller values of \D| and J than those of I. Species II is attributed to an impurity present in very low concentrations.

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