37343-83-2Relevant academic research and scientific papers
Demonstration of the degeneracy of the singlet and triplet states in 2,3-dimethylenecyclohexane-1,4-diyl by measurement of its magnetic properties
Matsuda, Kenji,Iwamura, Hiizu
, p. 1023 - 1026 (1998)
Magnetic susceptibility and magnetization of 2,3-dimethylenecyclohexane-1,4-diyl (1), a conformationally restricted tetramethyleneethane (TME), have been investigated at 2-20 K and applied fields of 0-5 T. Theoretical curves for a model in which singlet and triplet states are in equilibrium were fitted to the experimental data. In contrast with a previous interpretation of the EPR signal intensities, singlet and triplet states were found to be almost degenerate (2|J/kB| 1 K), thus resolving a controversy as to the theoretical and experimental interpretation of the ground state of 1.
Isolation and Energy Well of the 2,3-Dimethylene-1,4-cyclohexadiyl Diradical
Roth, Wolfgang R.,Biermann, Manfred,Erker, Gerhard,Jelich, Klaus,Gerhartz, Wolfgang,Goerner, Helmut
, p. 586 - 597 (2007/10/02)
Irradiation of both 5,6-dimethylene-2,3-diazabicyclooct-2-ene (1) and 2,3-dimethylenebicyclooctan-7-one (2) matrix isolated in argon yields the 2,3-dimethylene-1,4-cyclohexadiyl diradical (8), which was characterized by its UV and IR spectra.From the decomposition rate of 1, the dimerisation rate of 8, determined by flash photolysis of 1, and the product ratio of the monomeric and dimeric products obtained from 8, the energy well of 8 has been determined to be 23.8 kcal mol-1.
