TY - JOUR
T1 - Linear NiII-MnIII2-NiII tetramers
T2 - An oligomeric component of the MnIII2Ni II single-chain magnets
AU - Miyasaka, Hitoshi
AU - Nezu, Tomohiro
AU - Sugimoto, Kunihisa
AU - Sugiura, Ken Ichi
AU - Yamashita, Masahiro
AU - Clérac, Rodolphe
PY - 2004/9/6
Y1 - 2004/9/6
N2 - Heterometallic linear tetramers [Mn(5-R-saltmen)Ni(pao)(bpy) 2]2-(ClO4)4 (5-R-saltmen 2- = N,N′-1,1,2,2-tetramethylethylene bis(5-R- salicylideneiminate); pao- = pyridine-2-aldoximate; bpy = 2,2′-bipyridine, R = H, 1; Cl, 2; Br, 3; MeO, 4) have been synthesized and structurally characterized. These compounds exhibit a [NiII-NO- MnIII-(O)2-MnIII-ON-NiII] skeleton where -ON- is an oximate bridge between MnIII and NII ions and -(O)2- is a bi-phenolate bridge between MnIII ions. These tetramers can be seen as oligomeric units of the heterometallic Mn III2-NII chain observed in a family of single-chain magnets (Clérac, R.; Miyasaka, H.; Yamashita, M.; Coulon, C. J. Am. Chem. Soc. 2002, 124, 12837. Miyasaka, H.; Clérac, R.; Mizushima, K.; Sugiura, K.; Yamashita, M.; Wernsdorfer, W.; Coulon, C. Inorg. Chem. 2003, 42, 8203.). Magnetic measurements on these tetramers confirm the nature of the magnetic interactions reported for the MnIII2-Ni II chains: a strong antiferromagnetic MnIII/Ni II coupling via the oximate bridge (JNi-Mn ranges from -23.7 to -26.1 K) and a weak ferromagnetic MnIII/MnIII coupling through the bi-phenolate bridge (JMn-Mn ranges from +0.4 to +0.9 K). These magnetic interactions lead to tetramers with an S = 2 ground state.
AB - Heterometallic linear tetramers [Mn(5-R-saltmen)Ni(pao)(bpy) 2]2-(ClO4)4 (5-R-saltmen 2- = N,N′-1,1,2,2-tetramethylethylene bis(5-R- salicylideneiminate); pao- = pyridine-2-aldoximate; bpy = 2,2′-bipyridine, R = H, 1; Cl, 2; Br, 3; MeO, 4) have been synthesized and structurally characterized. These compounds exhibit a [NiII-NO- MnIII-(O)2-MnIII-ON-NiII] skeleton where -ON- is an oximate bridge between MnIII and NII ions and -(O)2- is a bi-phenolate bridge between MnIII ions. These tetramers can be seen as oligomeric units of the heterometallic Mn III2-NII chain observed in a family of single-chain magnets (Clérac, R.; Miyasaka, H.; Yamashita, M.; Coulon, C. J. Am. Chem. Soc. 2002, 124, 12837. Miyasaka, H.; Clérac, R.; Mizushima, K.; Sugiura, K.; Yamashita, M.; Wernsdorfer, W.; Coulon, C. Inorg. Chem. 2003, 42, 8203.). Magnetic measurements on these tetramers confirm the nature of the magnetic interactions reported for the MnIII2-Ni II chains: a strong antiferromagnetic MnIII/Ni II coupling via the oximate bridge (JNi-Mn ranges from -23.7 to -26.1 K) and a weak ferromagnetic MnIII/MnIII coupling through the bi-phenolate bridge (JMn-Mn ranges from +0.4 to +0.9 K). These magnetic interactions lead to tetramers with an S = 2 ground state.
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U2 - 10.1021/ic049457q
DO - 10.1021/ic049457q
M3 - Article
C2 - 15332795
AN - SCOPUS:4444370090
SN - 0020-1669
VL - 43
SP - 5486
EP - 5488
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 18
ER -