磁性过渡金属的首个碳二亚胺MnNCN的合成、晶体结构及性质
Synthesis, crystal structure, and properties of MnNCN, the first carbodiimide of a magnetic transition metal.
作者信息
Liu Xiaohui, Krott Manuel, Müller Paul, Hu Chunhua, Lueken Heiko, Dronskowski Richard
机构信息
Institut für Anorganische Chemie der RWTH Aachen, Landoltweg 1, D-52056 Aachen, Germany.
出版信息
Inorg Chem. 2005 May 2;44(9):3001-3. doi: 10.1021/ic050050a.
Synthesis, single-crystal structure determination, and magnetic properties are reported for manganese carbodiimide, MnNCN. The presumably unstable but inert phase adopts the trigonal system (R3m) with a = 3.3583(4) A, c = 14.347(2) A, V = 140.13(3) A3, and Z = 3. Divalent manganese is octahedrally coordinated by nitrogen atoms at 2.26 A, and the NCN(2-) unit adopts the linear N=C=N carbodiimide shape with two C=N double bonds of 1.23 A. MnNCN contains high-spin Mn(II) with five unpaired electrons and behaves like an antiferromagnet with an ordering temperature below 30 K.
报道了碳二亚胺锰（MnNCN）的合成、单晶结构测定及磁性。该可能不稳定但呈惰性的相采用三方晶系（R3m），a = 3.3583(4) Å，c = 14.347(2) Å，V = 140.13(3) ų，Z = 3。二价锰由氮原子以2.26 Å的距离进行八面体配位，且NCN²⁻单元呈线性[N=C=N]²⁻碳二亚胺形状，具有两个1.23 Å的C=N双键。MnNCN含有具有五个未成对电子的高自旋Mn(II)，表现得像一个反铁磁体，其有序温度低于30 K。
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