title: Magnetic phase transition in a heteromolecular hydrogen-bonded complex of nitronylnitroxide radicals.
abstract: An organic molecular acid-base complex has been synthesized from pyridine-substituted biradical 2 in a triplet (S = 1) ground state and a benzoic acid derivative of monoradical 3 with S = 1/2. The two constituent molecules are bound by an OH-N hydrogen bond in a crystalline solid state. The complex has been found to exhibit an antiferromagnetic phase transition at 5 K. The complex is the first example of a hydrogen-bonded heterospin, heteromolecular complex exhibiting a magnetic phase transition in purely organic molecule-based materials.
authors.affiliation: Department of Materials Science, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hayakawa
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shiomi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Ise
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Sato
authors.forename: Takeji
authors.initials: T
authors.lastname: Takui