Design of single chain magnets through cyanide-bearing six-coordinate complexes

作者：Lescouezec R; Toma LM; Vaissermann J; Verdaguer M; Delgado FS; Ruiz Perez C; Lloret F; Julve M^*

来源：Coordination Chemistry Reviews, 2005, 249(23): 2691-2729.

DOI：10.1016/j.ccr.2005.09.017

• cyanocomplexes
• preparation
• crystal structures
• polynuclear complexes
• bimetallic chains
• chains as magnets
• magnetic properties

The design and preparation of stable cyanide-bearing six-coordinate complexes of formula [M-III(L)(CN)(x)]((x+t-m)-) = trivalent transition metal ion and L = polydentate blocking ligand are summarized here. Their use as ligands towards either fully hydrated metal ions or coordinatively unsaturated preformed species, to afford a wide variety of low-dimensional metal assemblies whose nuclearity, dimensionality and magnetic properties can be tuned, is also reviewed. Special emphasis is put on the appropriate choice of the end-cap ligand L whose denticity determines the number of coordinated cyanide groups in the mononuclear precursors. Among the different new spin topologies obtained through this rational synthetic strategy, ferromagnetically coupled 4,2-ribbon like bimetallic chains which exhibit slow magnetic relaxation and hysteresis effects (chain as magnets) are one of the most appealing and constitute the heart of the present contribution.

• 出版日期2005-12-1