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Lattice trapping of metastable quintet state bis(2,6-bis(pyrazol-3-yl)pyridine)iron(II) bis(tetrafluoroborate), a spin crossover system, and kinetics of the quintet-singlet transformation

✍ Scribed by Harold A. Goodwin; Kristian H. Sugiyarto

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 393 KB
Volume: 139
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80593-6

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✦ Synopsis

The 'Tz% 'A, spin transition in [ Fe( bpp),][ BF412 (bpp= 2,6-bis( pyrazol-3-yl)pyridine) is abrupt and complete and shows hysteresis with the transition temperatures r,r = 173 K and T,t = 183 K. Rapid cooling of the sample causes the freezing-in of metastable quintet state species at low temperatures. Relaxation of the metastable quintet to singlet state species within the range 99-114 K follows simple first-order kinetics with an activation energy E.= 19.5 kJ mol-'.