Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 135, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3672101
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Funding
- National Science Foundation (UT, UM, NHMFL)
- (U. S.) Department of Energy (NHMFL)
- State of Florida (NHMFL)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1063880] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0809791] Funding Source: National Science Foundation
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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. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3672101]
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