Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 34, Pages 11906-11909Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5063746
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- University of Cyprus
- Cyprus Research Promotion Foundation
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1-Phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e] [1,2,4]triazin-4-yl is the first example of a hydrazyl radical that shows a reversible sharp spin transition fully completed within 5(1) K. The nominally first-order transition takes place at ca. 58(2) K and proceeds via subtle changes of intra- and interstack interactions between two similar structural phases. The low-temperature phase (5-60 K) is diamagnetic and has a singlet ground state (2J(exp) = -166.8 cm(-1), g(solid) = 2.0042, rho = 0.2%) stemming from a multicenter two-electron interaction. The high-temperature phase (60-300 K) is paramagnetic as a result of noninteracting S = 1/2 spins arising from weakly bound dimers.
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