Communication: Manipulating the singlet-triplet equilibrium in organic biradical materials
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
- 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, Vol. 135, Issue 24; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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