A new series of polyoxometalate compounds built up of paradodecatungstate anions and transition metal/alkaline-earth metal cations

作者：Yuan Ling; Qin Chao; Wang Xinlong; Wang Enbo^*; Li Yangguang

来源：Solid State Sciences, 2008, 10(8): 967-975.

DOI：10.1016/j.solidstatesciences.2007.12.011

• polyoxometalates
• transition metal
• paratungstate-B
• luminescent property
• magnetic property

Three new extended frameworks based on the paradodecatungstate cluster and transition metals or alkaline-earth metal have been synthesized and characterized by elemental analysis, IR spectroscopy, thermal gravimetric analysis (TGA), X-ray powder diffraction (XRPD) and single crystal X-ray diffraction. The 2D layered structure of the compound [Na-8(H2O)(28))[Mn(H2O)(2)(H2W12O42)]center dot 4H(2)O (1) is formed by the interconnection of 1D [Mn(H2O)(2)(H2W12O42)](n)(8-) and [Na-8(H2O)(28)](n)(8+) chains. In the compound [Zn-5(H2O)(20)(H2W12O42)]center dot 16H(2)O (2), two neighboring paratungstate ions [H2W12O42)](10-) are linked by [Zn-4(H2O)(14)](8+) units, leading to the formation of a 2D layer containing rhombic channels. The anion [Sr-2(H2O)(6)(H2W12O42)](6-) of the compound K[Na-5(H2O)(6)][Sr-2(H2O)(6)(H2W12O42)]center dot 18H(2)O (3) shows a layer-like structure in which paratungstate-B units act as six-dentate ligands coordinating to six Sr2+ ions through the terminal oxygen atoms. Interestingly, the strong involvement of the potassium and sodium counteractions leads the neighboring layers to tie together generating a 3D network containing two types of channels. Furthermore, compounds 1-3 give intense blue luminescent emissions in solid state and the magnetic susceptibility of compound I has also been studied.

• 出版日期2008-8
• 单位东北师范大学