Spin crossover behavior of dinuclear FeII complexes with bis-tetradentate bridging-type ligands

Shinji Kanegawa, Soonchul Kang, Osamu Sato

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The preparation and characterization of two new FeII dinuclear complexes with bis-tetradentate bridging-type ligands [{Fe(NCS)2}2 (L)]·DMF·2H2O (1: L = L1{2,5-bis[N,Nbis( 2-pyridylmethyl)aminomethyl]pyrazine}, 2: L = L2{2,3- bis[N,N-bis(2- pyridylmethyl)aminomethyl]pyrazine}) are reported. Magnetic measurements reveal that complexes 1 and 2 exhibit different thermal spin-crossover behavior. Complex 1 shows a crystalline solvent effect on spin crossover (SCO). After desorption of the crystalline solvent by heating, an abrupt one-step transition with a hysteresis loop was observed for the desolvated form 1′. Conversely, a gradual twostep SCO was obtained for 2. The photomagnetic effect was also investigated in 1′ and 2, and both complexes clearly show light-induced excited spin state trapping. Interestingly, one-step and two-step thermal relaxation were observed for 1′ and 2, respectively. Such different SCO properties occur because of the cooperative effects owing to the structure of the ligand.

Original languageEnglish
Pages (from-to)725-729
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number5-6
DOIs
Publication statusPublished - Feb 1 2013

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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