Acta Chimica Sinica ›› 1990, Vol. 48 ›› Issue (8): 790-796. Previous Articles     Next Articles

Original Articles

Dawson结构钼砷杂多酸(盐)的合成与性质研究

王恩波;胡长文;周延修;刘景福;赵世良   

  1. 东北师范大学化学系
  • 出版日期:1990-08-15 发布日期:1990-08-15

The syntheses and characterization of dawson structure molybdoarsenic acid and salts

WANG ENBO;HU CHANGWEN;ZHOU YANXIU;LIU JINGFU;ZHAO SHILIANG   

  • Online:1990-08-15 Published:1990-08-15

Twenty molybdoarsenic acid and salts MxAs2Mo18O62.nH2O (M = NH4+, Li+, Na+, K+, Cs+, Ca2+, Mg2+, Sr2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Al3+, La3+, Ce3+, Pr3+, Nd3+, Sm3+, Gd3+) with Dawson structure, were synthesized and characterized by IR and UV spectroscopy, polarog., cyclic voltammetry and thermogravimetry. Hexa-basicity were established using conductive and acid-base titrns. The reduction mechanism of As2Mo18O626- in aqueous solution is suggested. The UV bands of the compounds were assignedf as e ?e* and e ?b2 transition according to the energy levels of MO's of MOL5 type compounds with C4v symmetry. The effects of the countercations Mn+ on the IR spectra, thermal decomposition temperature and decomposition products are discussed.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, OXIDATION REDUCTION REACTION, REACTION MECHANISM, INFRARED SPECTROPHOTOMETRY, HETEROPOLYACID, MOLYBDATE, ELEMENTAL ANALYSIS, EXTRACTION, POLAROGRAPHIC ANALYSIS, THERMOGRAVIMETRY

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