Hexamethoxyphenalenyl as a Possible Quantum Spin Simulator: An Electronically Stabilized Neutral π Radical with Novel Quantum Coherence Owing to Extremely High Nuclear Spin Degeneracy


  • This work was partially supported by Grants-in-Aid for Scientific Research on Innovative Areas (No. 20110006 and Quantum Cybernetics), Scientific Research (B) (No.23350011), and Elements Science and Technology Project from Ministry of Education, Culture, Sports, Science and Technology (Japan), and also by Core Research for Evolutional Science and Technology (CREST-JST) and FIRST-Quantum Information Processing Project.


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A phenalenyl radical with six methoxy groups, which were introduced symmetrically, has been synthesized. The extensively delocalized and highly symmetric electronic-spin system was studied with advanced cw-/pulsed-ESR techniques, thereby giving an experimental model to explore molecular quantum spin simulators with novel quantum coherence attributable to the extremely high degeneracy of the nuclear spin states owing to the eighteen equivalent protons.