Spin crossover complexes of iron(III) with an N4 tetradentate Schiff base ligand
作者： Greg Brewer , Jerry Jasinski , William Mahany , Leopold May , Sergey Prytkov
DOI: 10.1016/0020-1693(94)04387-B
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摘要: Abstract Iron(III) complexes of the Schiff base formed from condensation 2-aminobenzaldehyde and ethylenediamine, H2amben, were prepared by reaction H2amben with iron(III) halides in acetone. Fe(amben)Cl Fe(amben)Br·H2O exhibit a spin crossover between 2T 6A states as shown magnetic susceptibility measurements, variable temperature Mossbauer spectra, electron resonance at 77 K. Structural investigation this ligand system was carried out on copper(II) nickel(II) analogues. Cu(amben) Ni(amben) are both orthorhombic space group P212121 (No. 19) unit cell parameters volume = 7.744(2), b 26.486(7), c 6.9706(8) A , V 1429.7(8) 3 for 7.651(1), 25.993(5), 7.040(1) 1400.1(4) Ni(amben). The final R values (a total 1515 reflections which 1246 classified observed (I>3.00σ(I)) 1483 979 observed) 0.059, Rw 0.90 0.065, 0.085, respectively. Both monomeric approximately square planar. large dihedral angles phenyl rings (26.7°) (27.4°) may be related to observation behavior complexes.
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