Communication: Manipulating the singlet-triplet equilibrium in organic biradical materials

Journal Article · Wed Dec 28 04:00:00 EST 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3672101· OSTI ID:22038826

Guenaydin-Sen, Oe; Fosso-Tande, J; Chen, P; White, J L; Musfeldt, J L ^[1]; Allen, T L; Lahti, P M ^[2]; Cherian, J; Tokumoto, T; McGill, S ^[3]; Harrison, R J ^[1]

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1. Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
3. National High Magnetic Field Laboratory, Tallahassee, Florida 32310 (United States)

We investigated the tunability of the singlet-triplet equilibrium population in the organic biradical 1,4-phenylenedinitrene via magneto-optical spectroscopy. A rich magnetochromic response occurs because applied field increases the concentration of the triplet state species, which has a unique optical signature by comparison with the singlet biradical and the precursor molecule. A Curie-like analysis of the magneto-optical properties allows us to extract the spin gap, which is smaller than previously supposed. These measurements establish the value of local-probe photophysical techniques for magnetic property determination in open-shell systems such as biradicals where a traditional electron paramagnetic resonance Curie law analysis has intrinsic limitations.

• OSTI ID: 22038826
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 24 Vol. 135; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
COMPARATIVE EVALUATIONS
DENSITY FUNCTIONAL METHOD
ELECTRON SPIN RESONANCE
EQUILIBRIUM
EXCITED STATES
MAGNETIC PROPERTIES
OPTICAL PROPERTIES
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
TRIPLETS