MAGNETIC-STRUCTURE OF THE HYL-2,2'-M-PHENYLENEBIS(4,5-DIHYDROIMIDAZOL-1-OXYL 3-OXIDE) BIRADICAL - QUANTUM SPIN EFFECT OF S=1 SPECIES ASSOCIATED WITH STRUCTURAL-CHANGE

Authors
SHIOMI D TAMURA M KATORI HA GOTO T HAYASHI A UEDA Y SAWA H KATO R KINOSHITA M
Citation
D. Shiomi et al., MAGNETIC-STRUCTURE OF THE HYL-2,2'-M-PHENYLENEBIS(4,5-DIHYDROIMIDAZOL-1-OXYL 3-OXIDE) BIRADICAL - QUANTUM SPIN EFFECT OF S=1 SPECIES ASSOCIATED WITH STRUCTURAL-CHANGE, Journal of materials chemistry, 4(6), 1994, pp. 915-920
Citations number
12
Categorie Soggetti
Chemistry Physical","Material Science
Journal title
Journal of materials chemistry → ACNP
ISSN journal
09599428
Volume
4
Issue
6
Year of publication
1994
Pages
915 - 920
Database
ISI
SICI code
0959-9428(1994)4:6<915:MOTH>2.0.ZU;2-2
Abstract
A peculiar magnetic structure has been found in the crystal of a stabl e organic biradical molecule with S=1, hyl-2,2'-m-phenylenebis(4,5-dih ydroimidazol-1-oxyl 3-oxide) (m-BNN). A high-field magnetization proce ss up to 40 T at 1.8 K exhibits a two-fold saturation process. Powder X-ray diffraction reveals the breakdown of the translational equivalen ce between the biradical dimers at low temperature. From these results , it is concluded that there is a four-fold quasi-degeneracy associate d with a singlet pair formation between two S=1/2 spins in only half t he biradical dimers in the crystal.