TY - JOUR
T1 - Syntheses, structures, and electrochemical and magnetic properties of rectangular heterobimetallic clusters based on tricyanometallic building blocks
AU - Wang, Cai Feng
AU - Liu, Wei
AU - Song, You
AU - Zhou, Xin Hui
AU - Zuo, Jing Lin
AU - You, Xiao Zeng
PY - 2008/2
Y1 - 2008/2
N2 - Three tricyanometalate precursors, (Bu4N)[(PhTp)Fe(CN) 3]· H2O (1), (Bu4N)[(MeTp)Fe(CN) 3] (2), and (Bu4N)[(iBuTp)-Fe(CN)3] (3) [Bu4N+ = tetrabutylammonium cation; PhTp = tris(pyrazolyl)phenylborate; MeTp = methyltris(pyrazolyl)-borate; iBuTp = 2-methylpropyltris(pyrazolyl)borate], were successfully synthesized. By using 1-3 as building blocks, four rectangular clusters, [(PhTp)Fe(CN) 3Cu(bpy)(H2O)-(ClO4)]2· 2H2O (4; bpy = 2,2′-bipyridine), [(PhTp)Fe(CN) 3Ni-(tren)]2(ClO4)2 [5; tren = tris(2-amino)ethylamine], [(MeTp)-Fe(CN)3Ni(tren)] 2(ClO4)2·2H2O (6), and [(iBuTp)Fe(CN)3Ni-(tren)]2(ClO4) 2·2H2O·2CH3OH (7), were prepared in parallel and structurally characterized. All clusters show similar square structures, where FeIII and MII (M = CuII or NiII) ions are alternatively located on the rectangle corners. The cyclic voltammograms of FeIII2NiII2 clusters 5-7 reveal two quasi-reversible iron-centered reduction processes and two quasi-reversible nickel-centered oxidation processes. Magnetic studies show intramolecular ferromagnetic coupling and appreciable magnetic anisotropy in clusters 4-7. Complexes 5-7 show obvious frequency dependence in the alternating current magnetic susceptibility data, which indicates single-molecule magnet behavior with preexponential factors of τ0 = 4.5 × 10 -8 s (5), 6.1 × 10-8 s (6), and 5.0 × 10 -8 s (7) and the effective spin-reversal barriers of Ueff = 17.5K (5), 20.6 K (6), and 20.8 K (7).
AB - Three tricyanometalate precursors, (Bu4N)[(PhTp)Fe(CN) 3]· H2O (1), (Bu4N)[(MeTp)Fe(CN) 3] (2), and (Bu4N)[(iBuTp)-Fe(CN)3] (3) [Bu4N+ = tetrabutylammonium cation; PhTp = tris(pyrazolyl)phenylborate; MeTp = methyltris(pyrazolyl)-borate; iBuTp = 2-methylpropyltris(pyrazolyl)borate], were successfully synthesized. By using 1-3 as building blocks, four rectangular clusters, [(PhTp)Fe(CN) 3Cu(bpy)(H2O)-(ClO4)]2· 2H2O (4; bpy = 2,2′-bipyridine), [(PhTp)Fe(CN) 3Ni-(tren)]2(ClO4)2 [5; tren = tris(2-amino)ethylamine], [(MeTp)-Fe(CN)3Ni(tren)] 2(ClO4)2·2H2O (6), and [(iBuTp)Fe(CN)3Ni-(tren)]2(ClO4) 2·2H2O·2CH3OH (7), were prepared in parallel and structurally characterized. All clusters show similar square structures, where FeIII and MII (M = CuII or NiII) ions are alternatively located on the rectangle corners. The cyclic voltammograms of FeIII2NiII2 clusters 5-7 reveal two quasi-reversible iron-centered reduction processes and two quasi-reversible nickel-centered oxidation processes. Magnetic studies show intramolecular ferromagnetic coupling and appreciable magnetic anisotropy in clusters 4-7. Complexes 5-7 show obvious frequency dependence in the alternating current magnetic susceptibility data, which indicates single-molecule magnet behavior with preexponential factors of τ0 = 4.5 × 10 -8 s (5), 6.1 × 10-8 s (6), and 5.0 × 10 -8 s (7) and the effective spin-reversal barriers of Ueff = 17.5K (5), 20.6 K (6), and 20.8 K (7).
KW - Crystal structures
KW - Cyanometalates
KW - Magnetic properties
KW - Polynuclear complexes
KW - Single-molecule magnets
UR - http://www.scopus.com/inward/record.url?scp=52949149451&partnerID=8YFLogxK
U2 - 10.1002/ejic.200701104
DO - 10.1002/ejic.200701104
M3 - 文章
AN - SCOPUS:52949149451
SN - 1434-1948
SP - 717
EP - 727
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 5
ER -