Magnetic coupling of nitronyl nitroxide-based biradical salts

Citation
D. Shiomi et al., Magnetic coupling of nitronyl nitroxide-based biradical salts, SYNTH METAL, 103(1-3), 1999, pp. 2271-2272
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SYNTHETIC METALS
ISSN journal
03796779 → ACNP
Volume
103
Issue
1-3
Year of publication
1999
Pages
2271 - 2272
Database
ISI
SICI code
0379-6779(199906)103:1-3<2271:MCONNB>2.0.ZU;2-S
Abstract
A crystal-engineering approach to organic ferrimagnetics is reported. Coulo mbic energy between cationic biradical with S=1 and anionic radical with S= 1/2 is a promising driving force of co-crystallizing the hetero-molecular a ssemblage in a controllable manner. As a cationic component of "organic sal t ferrimagnetics", two kinds of nitronyl nitroxide biradicals, 2,6- and 3,5 -substituted pyridine derivatives, were examined. It was predicted from sem i-empirical molecular orbital calculations that both the 2,6- and 3,5-deriv atives have the tripler ground states both in the neutral and cationic stat es. The molecular ground state of the 2,6-biradical in the neutral state wa s found to be triplet from the magnetic susceptibility measurement, while t he susceptibility and ESR measurements suggested the singlet ground state f or the 3,5-biradical. The potential of the pyridine-based biradicals as the components of "organic salt ferrimagnetics" is discussed.