2005
DOI: 10.1002/anie.200502216
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Two‐Step Spin Conversion in a Cyanide‐Bridged Ferrous Square

Abstract: Molecules with many spin-crossover sites could be used as multistepped molecular switches. The CNbridged molecular square [Fe II 4 (m-CN) 4 (bpy) 4 (tpa) 4 ](PF 6 ) 4 (bpy = 2,2'-bipyridine; tpa = tris(2-pyridylmethyl)amine), a Prussian blue analogue, undergoes thermally induced, two-step spin conversion. For more information, see the Communication by H. Oshio and co-workers on the following pages.

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Cited by 192 publications
(102 citation statements)
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“…There are two distinct situations that account for stepwise transitions. One is observed when different SCO sites, characterized by distinct transition temperatures (T 1/2 or T c ), are present in the solid [10][11][12][13][14][15][16][17]. The other arises from subtle balances between different elastic interactions in the crystal lattice, which spontaneously generate two or more The crystal structures of the anhydrous and the hydrate species (x = 0, 1/3) were investigated at 200 K, 130 K and 90 K. At 200 K, the crystals are monoclinic (space group C2/c, (Z = 8)) and contain one crystallographically independent Fe II site, which is HS.…”
Section: Introductionmentioning
confidence: 99%
“…There are two distinct situations that account for stepwise transitions. One is observed when different SCO sites, characterized by distinct transition temperatures (T 1/2 or T c ), are present in the solid [10][11][12][13][14][15][16][17]. The other arises from subtle balances between different elastic interactions in the crystal lattice, which spontaneously generate two or more The crystal structures of the anhydrous and the hydrate species (x = 0, 1/3) were investigated at 200 K, 130 K and 90 K. At 200 K, the crystals are monoclinic (space group C2/c, (Z = 8)) and contain one crystallographically independent Fe II site, which is HS.…”
Section: Introductionmentioning
confidence: 99%
“…[2][3][4][5][6][7][8] Mono-or multinuclear systems that have more than one crystallographically distinct SCO site prior to a stepped transition may be merely interpreted in terms of the individual sites having different chemical environments and/or intermolecular interactions and hence different ligand field and/or interaction parameters. That such metal sites may undergo SCO at somewhat different temperatures is certainly no surprise.…”
Section: Introductionmentioning
confidence: 99%
“…Approaches to the generation of multi-bistable systems include the crystallization of mononuclear SCO complexes in asymmetric packing environments 21 , the co-crystallization of different bistable molecules 22 and the linkage of two or more bistable building blocks in a molecular system, in which the stabilization of an intermediate state depends on the degree to which neighbouring chromophores are electronically coupled 23 . Cooperative SCO behaviour, mediated by the steric and electronic stress applied to neighbouring metal centres by multidentate or bridging ligands, has been reported in dinuclear complexes 23 , tetranuclear squares 24,25 and grid-like complexes [26][27][28] . Indeed, the study of grid-type clusters is of particular interest, as their tunable electronic states 29,30 have seen them proposed as quantum cellular automata; molecular binary logic devices that function through coulombic interactions between metal centres on neighbouring cells 31 .…”
mentioning
confidence: 99%