Synthesis, crystal structure, and magnetic properties of hexanuclear [{MnL2}4{Nb(CN)8}2] and Nonanuclear [{MnL2}6{Nb(CN)8}3] heterometallic clusters (L=bpy, phen).
Synthesis, crystal structure, and magnetic properties of hexanuclear [{MnL2}4{Nb(CN)8}2] and Nonanuclear [{MnL2}6{Nb(CN)8}3] heterometallic clusters (L=bpy, phen).
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DOI：
10.1021/ic062383t
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发表时间：
2007-10
影响因子：
4.6
通讯作者：
T. S. Venkatakrishnan;Raghunathan Rajamani;S. Ramasesha;J. Sutter
中科院分区：
文献类型：
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作者：
T. S. Venkatakrishnan;Raghunathan Rajamani;S. Ramasesha;J. Sutter
通过cis-[MnCl_2（bpy）_2]与K_4 [Nb（CN）_8]反应，得到了一个锰原子上带有2，2 ′-联吡啶（bpy）作为封闭配体的六核氰基桥联{Mn_II_4 Nb_IV_2}簇合物（1）。当阻断配体为1，10-菲咯啉（phen）时，得到了一个非核簇合物{MnII 6 NbIV 3}（2）。[{Mn（bpy）2}4{Nb（CN）8}2]的晶体结构已通过单晶X射线晶体学解析，而phen衍生物的结构已通过相应的WIV类似物[{Mn（phen）2}6{W（CN）8}3（H2O）2]的结构分析得到证实。磁性测量显示这些聚集体的S=9和27/2自旋基态是反铁磁Nb-Mn相互作用的结果，JNb-Mn=-18.1 cm（-1）（1）和-13.6 cm（-1）（2）。
A hexanuclear cyano-bridged {MnII4NbIV2} cluster (1) bearing 2,2'-bipyridine (bpy) as the blocking ligand at manganese is obtained from the reaction of cis-[MnCl2(bpy)2] and K4[Nb(CN)8]. When the blocking ligand is 1,10-phenanthroline (phen), a nonanuclear cluster {MnII6NbIV3} (2) is obtained. The structure of [{Mn(bpy)2}4{Nb(CN)8}2] has been solved by single-crystal X-ray crystallography, whereas the phen derivative has been confirmed by means of the structure analysis of the corresponding WIV analogue [{Mn(phen)2}6{W(CN)8}3(H2O)2]. Magnetic measurements revealed S=9 and 27/2 spin ground states for these aggregates as a result of antiferromagnetic Nb-Mn interaction with JNb-Mn=-18.1 cm(-1) (1) and -13.6 cm(-1) (2).