Abstract
A crystal-engineering approach to organic ferrimagnetics is reported. Coulombic 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 assemblage in a controllable manner. As a cationic component of "organic salt ferrimagnetics", two kinds of nitronyl nitroxide biradicals, 2,6- and 3,5-substituted pyridine derivatives, were examined. It was predicted from semi-empirical molecular orbital calculations that both the 2,6- and 3,5-derivatives have the triplet ground states both in the neutral and cationic states. The molecular ground state of the 2,6-biradical in the neutral state was found to be triplet from magnetic susceptibility measurements, while the susceptibility and ESR measurements suggested a singlet ground state for the 3,5-biradical.
Original language | English |
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Pages (from-to) | 99-108 |
Number of pages | 10 |
Journal | Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals |
Volume | 334 |
DOIs | |
Publication status | Published - 1999 Jan 1 |
Keywords
- Crystal engineering
- Nitronyl nitroxide
- Organic ferrimagnet
- Organic salt
- Pyridinium cation
ASJC Scopus subject areas
- Condensed Matter Physics