Dimeric Complexes of a Tridentate Schiff Base Ligand – Crystal Structure of a CuII Complex with Uncommon μ2-Nsulfonamido Bridges and Ferromagnetic Behaviour

✍ Scribed by Jesús Sanmartín; Fernando Novio; Ana M. García-Deibe; Matilde Fondo; Noelia Ocampo; Manuel R. Bermejo

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 570 KB
• Volume: 2008
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200701344

✦ Synopsis

Abstract

N‐[2‐(Tosylamino)benzylidene]‐2‐[(tosylamino)methyl]aniline(H~2~L) has afforded M^II^~2~(L)~2~·__x__MeCN·__y__H~2~O complexes (M = Ni, Pd, Cu, Zn and Cd; x = 0 or 2; y = 0, 4, 6 or 8). Physicochemical characterisation data are indicative of the dinuclear nature of the complexes obtained, where the potential N,N,N‐donor L behaves as a dianionic and tridentate ligand. The crystal structure of Cu~2~(L)~2~·2MeCN was solved, and it demonstrates that a double μ~2~‐N~sulfonamido~ bridge assembles the neutral Cu~2~(L)~2~ dimers. This uncommon connection gives rise to a totally planar and nearly square‐shaped Cu~2~N~2~ metallacycle. The planar geometries around the copper ions undergo a seesaw‐shaped distortion, which is probably related to secondary Cu···O interactions with neighbouring tosyl groups. This spatial arrangement seems related to the ferromagnetic behaviour shown by the complex.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)