Synthesis, Structure and Magnetic Properties of a New Low-Spin Iron(III) Complex [FeL3] {L = [HNC(CH3)]2C(CN)}

✍ Scribed by Junichi Nishijo; Nobuyuki Nishi

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 171 KB
• Volume: 2006
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200600070

✦ Synopsis

Abstract

High‐temperature treatment of acetonitrile with CaC~2~ and FeCl~2~ afforded crystals of the new iron(III) S = 1/2 low‐spin complexes [FeL~3~]ROH (R = CH~3~ or C~2~H~5~), whose crystal structures were determined by single‐crystal X‐ray structural analysis. The methanol complex consists of a one‐dimensional arrangement of the iron moieties, while each methanol molecule is separated from each other by the complexes. On the other hand, the ethanol complex contains a two dimensional arrangement of the iron moieties and one dimensionally aligned ethanol molecules elongated perpendicular to the sheet. Because of the large difference in the inter‐complex overlap patterns between the ligands, the two materials show quite different magnetic properties. The magnetism of the crystal containing ethanol is well described by the singlet–triplet model with the antiferromagnetic interaction 2__J__/k~B~ = –7.5 K, while that containing methanol obeys the Curie law with a negligibly small Weiss temperature.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)