Diamond lattice in single-component molecular crystals comprising tetrabenzoporphyrin neutral radicals

Kosuke Mine; Sachie Arae; Hiroshi Murakawa; Masahisa Tsuchiizu; Noriaki Hanasaki; Masaki Matsuda

doi:10.1039/d3cc05948k

Diamond lattice in single-component molecular crystals comprising tetrabenzoporphyrin neutral radicals

Chem Commun (Camb). 2024 Mar 12;60(22):3019-3022. doi: 10.1039/d3cc05948k.

Authors

Kosuke Mine¹, Sachie Arae¹, Hiroshi Murakawa², Masahisa Tsuchiizu³, Noriaki Hanasaki², Masaki Matsuda¹

Affiliations

¹ Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 866-8555, Japan. masaki@kumamoto-u.ac.jp.
² Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
³ Department of Physics, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan.

PMID: 38288742
DOI: 10.1039/d3cc05948k

Abstract

A single-component molecular radical crystal of Co^III(tbp˙^-)(CN)₂, where tbp = tetrabenzoporphyrinato ligand, exhibiting a diamond lattice was fabricated as a potential candidate for a three-dimensional Dirac electron system. Band structure calculations revealed that the Fermi energy level was located at the Dirac point. A small electrical resistivity of 160 Ω cm was observed at 2 K under the application of 2.4 GPa. Furthermore, substituting Co^III by Fe^III or Mn^III led to the introduction of local magnetic moments into the diamond-lattice system. M^III(tbp˙^-)L₂ crystals will open up uncharted fields in the study of the Dirac electron systems.