若干多钒硼酸盐簇合物的光谱研究

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Abstract Four novel polyoxovanadium borates with [(VO)₁₂O₆B₁₈O₄₂], namely (enH₂)₆H₃[(VO)₁₂O₆B₁₈O₄₂]·13H₂O(1), [Ni(en)₂]₆H₃[(VO)₁₂O₆B₁₈O₄₂]·8H₂O(2), [Cu(en)₂]₅H₃[(VO)₁₂O₆B₁₈O₄₂][B(OH)₃]₂·16H₂O(3) and(enH₂)₄Na₄H₃[(VO)₁₂O₆B₁₈O₄₂]·8H₂O(4)，were synthesized. The relationship between their properties and structures were studied by using FTIR，UV-Vis DRS and fluorescence etc. Among these compounds, compound (1) possesses isolated [(VO)₁₂O₆B₁₈O₄₂] cage, there is a ring of B₁₈O₄₂ sandwiched between two vanadium-oxygen clusters V₆O₁₈ by eighteen B—(μ₃—O)—V bonds, while compound (2) is rather six [Ni(en)₂]，each connected with the B₁₈O₄₂ ring by two Ni—(μ₃—O)—B. In compounds (3) and (4), the anion clusters [(VO)₁₂O₆B₁₈O₄₂]^13- are connected with [Cu(en)₂]²⁺ and Na⁺, respectively. Thus, the compounds (3) and (4) are extended to an infinite two-dimensional network structure, respectively. These characteristic vibrational frequencies of polyoxovanadium borates are related to the structures of these compounds. In UV/Vis DRS spectra, there are two characteristic peaks of polyoxometalates at 205 and 260 nm, respectively. The fluorescence spectra of these four compounds have been studied, and they have emission peaks at 415 nm excited by 310 nm which are caused by O_μ→Mo. The fluorescence lifetimes of these compounds have been studied.

Key words：Polyoxometalate;Polyoxovanadium borate;Crystal structure;Spectra analysis

Received: 2003-09-06 Accepted: 2003-12-26

ZTFLH:

O644.1

Corresponding Authors: ZHANG Han-hui

Cite this article:

ZHANG Han-hui,LIN Zhi-hua,HUANG Chang-cang, et al. Spectral Study of Some Polyoxovanadium Borates [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(03): 369-373.

URL:

https://www.gpxygpfx.com/EN/Y2005/V25/I03/369

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