在层状的[Fe(II)(TCNE*-)(NCMe)₂]+[Fe(III)Cl₄]-（TCNE = 四氰基乙烯）中观察到磁有序（居里温度Tc = 90 K）。

Magnetic ordering (Tc = 90 K) observed for layered [Fe(II)(TCNE*-)(NCMe)2]+[Fe(III)Cl4]- (TCNE = tetracyanoethylene).

作者信息

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

机构信息

Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA.

出版信息

J Am Chem Soc. 2006 Dec 13;128(49):15592-3. doi: 10.1021/ja066744f.

DOI:10.1021/ja066744f

PMID:17147360

Abstract

[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 mu4-[TCNE]- spin coupling unit bonded to four FeII's, with an axial pair of MeCNs. The [FeIIICl4]- anion occupies sites between the [FeII(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.

摘要

[Fe(TCNE)(NCMe)₂][FeCl₄]是由TCNE与FeCl₂(NCMe)₂反应分离得到的，在90K以下呈亚铁磁体，是一类新型磁体的首个成员。它是首个金属离子与[TCNE]⁻*之间存在直接键合且结构已确定的金属 - TCNE磁体，拥有一个新颖的平面μ₄ - [TCNE]⁻自旋耦合单元，该单元与四个FeII键合，并带有一对轴向的MeCN。[FeIIICl₄]⁻阴离子占据[FeII(TCNE⁻)(NCMe)₂]⁺层之间的位置。[Fe(TCNE)(NCMe)₂][FeCl₄]在50K时的矫顽场为1730 Oe，剩余磁化强度为7500 emuK/mol。