Photoinduced magnetic phase transition in an organic radical 1,3,5-trithia-2,4,6-triazapentalenyl crystal at room temperature

✍ Scribed by J. Takeda; M. Imae; O. Hanado; S. Kurita; M. Furuya; K. Ohno; T. Kodaira

• Book ID: 104108552
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 206 KB
• Volume: 378
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)01340-x

✦ Synopsis

Photoinduced magnetic phase transition in an organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) crystal was investigated at room temperature through photoinduced ESR and Raman scattering measurements. We found that the photoexcitation of the charge-transfer band induces a low-temperature diamagnetic to high-temperature paramagnetic phase transition with a clear threshold photon density of $1.0 Â 10 21 /cm 3 , while that of the intramolecular p-p transition band induces a phase transition without a clear threshold photon density. The mechanism of the photoinduced magnetic phase transition in TTTA is discussed in comparison with that of the photoinduced ionic-to-neutral phase transition in TTF-CA.