Azide and oxo bridged ferromagnetic clusters: Three face-shared tetracubane Ni(II)/Co(II) hexamers and a wheel-shaped SMM-like Co(II) heptamer
Azide and oxo bridged ferromagnetic clusters: Three face-shared tetracubane Ni(II)/Co(II) hexamers and a wheel-shaped SMM-like Co(II) heptamer
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叠氮化物和氧桥铁磁簇:三个共享面的四立方烷 Ni(II)/Co(II) 六聚体和轮状 SMM 型 Co(II) 七聚体
DOI:
10.1016/j.ica.2008.03.020
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发表时间:
2008-10
影响因子:
2.8
通讯作者:
Gao, Song
中科院分区:
文献类型:
--
作者:
Wang, Bing-Wu;Wang, Xiu-Teng;Zhang, Wen;Wang, Zhe-Ming;Gao, Song
Four azide and oxo bridged polynuclear Ni(II) and Co(II) complexes have been constructed by the simultaneous use of Hhdeo (Hhdeo=2-hydroxy-[1,2-di(pyridin-2-yl)] ethane-1-one) and azide as ligands: [Ni6(Hhdeo)2(hdeo)4(N3)6]·(ClO4)2·2DMF·2H2O (1), [Co6(Hhdeo)2(hdeo)4(N3)6]·(ClO4)2·2DMF·2H2O (2), [Ni6(Hhdeo)2(hdeo)4(N3)6]·(ClO4)2·6H2O (3) and [Co7(hdeo)6(N3)6]·(ClO4)2·2H2O (4). Compounds 1–3 all crystallize in monoclinic space group P21/c, and consist of face-shared tetracubane hexanuclear cores, which are bridged by μ2, μ3-O and μ2-1,1, μ3-1,1,1-N3. Compound 4 crystallizes in triclinic space group P1¯, and is made up of wheel-like heptanuclear cores [Co7(hdeo)6(N3)6]2+bridged by μ2-O and μ3-1,1,1-N3. For Co(II), the reaction solvents are found to play important roles in directing the final products with hexanuclear or heptanuclear topologies. Magnetic studies demonstrate overall intra-molecular ferromagnetic (F) couplings in these four compounds, which result from, according to our theoretical analysis, the competition between different kinds of exchange interactions within the metallic triangle units. No single-molecule magnet behavior was observed above 1.9K in complex 1–3. However, compound 4 shows significant slow relaxation at static zero and 600Oe fields below 4K, towards single molecule magnet (SMM) behavior.
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影响因子:
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作者:
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通讯作者:
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DOI:
10.1007/978-3-662-05250-1_3
发表时间:
2003
期刊:
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影响因子:
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作者:
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通讯作者:
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影响因子:
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