Synthesis, Crystal Structure, and Magnetic Properties of Hexanuclear [{MnL<sub>2</sub>}<sub>4</sub>{Nb(CN)<sub>8</sub>}<sub>2</sub>] and Nonanuclear [{MnL<sub>2</sub>}<sub>6</sub>{Nb(CN)<sub>8</sub>}<sub>3</sub>] Heterometallic Clusters (L = bpy, phen)
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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).
创建时间：
2016-07-05
