Photoredox chemistry in oxide clusters. Photochromic and redox properties of polyoxometalates in connection with analog solid state colloidal systems
Photoredox chemistry in oxide clusters. Photochromic and redox properties of polyoxometalates in connection with analog solid state colloidal systems
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DOI：
10.1021/jp953326g
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发表时间：
1996-07-25
影响因子：
--
通讯作者：
CasanPastor, N
中科院分区：
文献类型：
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作者：
GomezRomero, P;CasanPastor, N
本文报道了分子式为H-4[SiW_（12）O_（40）]和H-3[PMo_（12）O_（40）]的聚氧乙烯酸盐的电化学和光氧化还原化学数据，并与相关的扩展固体（WO_3和胶体WO_3颗粒）的电化学和光氧化还原化学数据进行了对比分析。类似的还原物种可以通过光化学方法获得，伴随着有机底物的氧化。所报道的光致变色行为与胶体WO 3颗粒的光致变色行为相似。另一方面，电化学电位与WO 3胶体的平带电位有很大不同。最后，标题化合物是更稳定的，并提出了额外的优势，具有良好的表征单分散和可控的结构和可调的电化学性能。
Data on the electrochemical and photoredox chemistry of polyoxometalates of formula H-4[SiW12O40] and H-3[PMo12O40] are reported and analyzed in relation to those of related extended solids (WO3 and colloidal WO3 particles), These soluble multinuclear anions show reversible single-electron and multielectron reduction processes to yield blue mixed valent species. Similar reduced species can be obtained photochemically, with a concomitant oxidation of organic substrates. The reported photochromic behavior is similar to that of colloidal WO3 particles. On the other hand, electrochemical potentials differ substantially from the flat band potential of WO3 colloids. Finally, the title compounds are more stable and present the added advantage of having well-characterized monodisperse and controllable structures and tunable electrochemical properties.