Atypical photomagnetic properties in a series of binuclear iron(II) spin crossover complexes

  • Chastanet G
  • Carbonera C
  • Mingotaud C
 et al. 
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The authors have reexamd. the photomagnetic properties of binuclear Fe(II) complexes [{Fe(L)(NCX)2}2bpym], where L is bpym = 2,2'-bipyrimidine and bt = 2,2'-bithiazoline and X = S, Se, by light irradn. at 647.1-676.4 nm and at 830 nm and after optical excitation the magnetic behaviors of [{Fe(bpym)(NCSe)2}2bpym] (2), [{Fe(bt)(NCS)2}2bpym] (3) and [{Fe(bt)(NCSe)2}2bpym] (4) are close to the antiferromagnetic response of [{Fe(bpym)(NCS)2}2bpym] (1) characterized by two Fe(II) metal ions in the HS electronic configuration. This hypothesis of quant. HS-HS photoconversion is also supported by the reflectivity expts. and the IR spectroscopies performed on 3. The authors have also studied the relaxation process of 2-4 by using a SQUID magnetometer. Atypical magnetic behavior is found for compds. 3 and 4. More precisely, while the magnetic response of 2 vs time continuously decreases whatever the temp., the signal of 3 increases

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  • Guillaume Chastanet

  • Chiara Carbonera

  • Christophe Mingotaud

  • Jean François Létard

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