4.7 Article

Spin-triplet excitons in 1,3-diphenyl-7-(fur-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl

Journal

CHEMICAL COMMUNICATIONS
Volume 49, Issue 77, Pages 8662-8664

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cc44899a

Keywords

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Funding

  1. University of Cyprus (Medium Sized Grants)
  2. Cyprus Research Promotion Foundation [YGEIA/BIOS/0308(BIE)/13, NEKYP/0308/02]
  3. Israel Science Foundation
  4. CFI
  5. ORF
  6. EPSRC [EP/K017322/1] Funding Source: UKRI
  7. Engineering and Physical Sciences Research Council [EP/K017322/1] Funding Source: researchfish

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7-(Fur-2-yl) benzotriazinyl 1 is the first example of a hydrazyl radical dimer with a thermally accessible triplet state. The triplet exciton (vertical bar D vertical bar = 0.018 cm(-1), vertical bar E vertical bar = 0.001 cm(-1)) was observed by solid-state VT-EPR spectroscopy between 5 and 140 K. VT crystallography, DFT calculations and magnetic susceptibility studies reveal a strong temperature dependence of the intra-dimer exchange interaction with J/k similar to -254 + 0.0007T(2).

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