四金属簇钨砷夹心型化合物[M_4(H_2O)_2·(AsW_9O_(34))_2]^(10-)(M=Cu~Ⅱ,Co~Ⅱ,Mn~Ⅱ,Ni~Ⅱ,Zn~Ⅱ)的合成、结构和磁特性研究

Synthesis, Structure and Magnetic Properties of the Sandwich-type Tungstoarsenates Containing Tetrametallic Cluster[M_4(H_2O)_2(AsW_9O_(34))_2]^(10-)(M=Cu~Ⅱ , Co~Ⅱ , Mn~Ⅱ, Ni~Ⅱ, Zn~Ⅱ).

取代型杂多化合物可改变多酸化合物的酸碱性、氧化还原性和热稳定性,因而受到关注[1]. 夹心型化合物是一类新型化合物,具有大的摩尔质量,高的负电荷,且含有多个磁性中心,近年来已引起国内外的兴趣[2].

Abstract The compounds [M4(H2O)2(AsW9O34)2]10-(M = Cu1 , Co1 , Mn1 , Ni1 , Zn1) were synthesized and characterized by IR, UV, elemental analysis and magnetic measurements. These compounds are isostructural to the P derivatives and comprise a rhomb-like M4O16 group encapsulated between two fragments of the trivacant Keggin polyanion [AsW9O34]9-. The crystal structures of the Mn1 and Cu1 derivatives were compared with that of the P derivatives. The Mn1 derivative exhibits antiferromagnetic Mn-Mn exchange interactions and S=0 ground state.