An iron(II) complex with ferrocenyl groups, [Fe(dppFc) 2 ](BF 4 ) 2 ·2Et 2 O ( 1 ·2Et 2 O, dppFc = 1-ferrocenyl-2-{(2,6-bis(pyrazolyl)pyridyl}ethylene), was prepared. X-ray crystallographic analyses revealed that 1 ·2Et 2 O underwent a single-crystal-to-single-crystal transformation with the release of crystal solvent molecules. In magnetic susceptibility measurements, a reversible conversion between paramagnetism and spin-crossover induced by solvent molecules was observed.
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Nihei et al. (2007) studied this question.
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