Pentanuclear Cyanide-Bridged Complexes with High Spin Ground States S=6 and 9: Characterization and Magnetic Properties

✍ Scribed by Arnaud Marvilliers; Cédric Hortholary; Guillaume Rogez; Jean-Paul Audière; Eric Rivière; Joan Cano Boquera; Carley Paulsen; Vincent Villar; Talal Mallah

• Book ID: 102610622
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 384 KB
• Volume: 159
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9159

✦ Synopsis

Two pentanuclear complexes are obtained from the reaction of hexacyanochromate(III) with one to two molar equivalents of [Ni(H 2 O) 6 ] 2؉ and bidentate organic ligands that chelate the metal ion, leaving two coordination sites in cis positions. Even though the crystal structure was not solved, the full characterization supports the formation of pentanuclear discrete species.

[Cr(CN) 6 ] 2 [Ni(HIM2-py) 2 ] 3 ' 7H 2 O, 1, has a ground spin state S ‫؍‬ 6 owing to the ferromagnetic interaction between Cr III (S ‫؍‬ 3/2) and N II (S ‫؍‬ 1). The presence of six organic radicals that couple ferromagnetically with Ni II in [Cr(CN) 6 ] 2 [Ni(IM2py) 2 ] 3 ' 7H 2 O, 2, leads to an S ‫؍‬ 9 ground state. A.c. susceptibility measurements below 2K indicate the occurrence of an antiferromagnetic order at 1.5 K in 2.