Magnetic Ordering (Tc = 90 K) Observed for Layered
[FeII(TCNE•-)(NCMe)2]+[FeIIICl4]- (TCNE = Tetracyanoethylene)

Pokhodnya, Konstantin I.; Bonner, Michael; Her, Jae-Hyuk; Stephens, Peter W.; Miller, Joel S.

doi:10.1021/ja066744f.s002

ja066744f_si_002.pdf (74.65 kB)

Magnetic Ordering (T_c = 90 K) Observed for Layered [Fe^II(TCNE^•-)(NCMe)₂]⁺[Fe^IIICl₄]^- (TCNE = Tetracyanoethylene)

journal contribution

posted on 2006-12-13, 00:00 authored by Konstantin I. Pokhodnya, Michael Bonner, Jae-Hyuk Her, Peter W. Stephens, Joel S. Miller

[Fe(TCNE)(NCMe)₂][FeCl₄] is isolated from the reaction of TCNE and FeCl₂(NCMe)₂ and orders as a ferrimagnet below 90 K and is the initial member of a new class of magnets. It is the first metal−TCNE magnet with direct bonding between metal ion and [TCNE]^•- whose structure has been determined, and it possesses a novel planar μ₄-[TCNE]^•- spin coupling unit bonded to four Fe^II's, with an axial pair of MeCNs. The [Fe^IIICl₄]^- anion occupies sites between the [Fe^II(TCNE^•-)(NCMe)₂]⁺ layers. [Fe(TCNE)(NCMe)₂][FeCl₄] has a coercive field of 1730 Oe and a remnant magnetization of 7500 emuK/mol at 50 K.