Hydrothermal synthesis under basic conditions has given a new cluster compound, Ni7(OH)8(ox)3(pip)3
(ox = oxalate; pip = piperazine). This hybrid material comprises inorganic Ni7(OH)8 clusters, which have a vertex-shared dicubane structure. These units are held together in a 3-dimensional coordination network by organic bridging ligands. Magnetic susceptibility studies suggest a ferromagnetic coupling within the cluster and an antiferromagnetic interaction between neighbouring Ni7 units. At low temperatures the material appears to undergo a magnetic phase transition to an ordered antiferromagnetic state with TN = 17 K.
在碱性条件下进行的
水热合成产生了一种新的团簇化合物--Ni7(OH)8(ox)3(pip)3(ox =
草酸盐;pip =
哌嗪)。这种混合材料由无机 Ni7(OH)8 团簇组成,具有顶点共享的二杜烷结构。这些单元通过有机桥接
配体结合成一个三维配位网络。磁感应强度研究表明,簇内存在
铁磁耦合,相邻的 Ni7 单元之间存在反
铁磁作用。在低温条件下,这种材料似乎会发生磁性相变,进入有序的反
铁磁状态(TN = 17 K)。