化学学报 ›› 1994, Vol. 52 ›› Issue (2): 155-159. 上一篇    下一篇

研究论文

磷钼钨杂多酸还原态的电子自旋共振研究

戚海华;杨晓亘;颜其洁;傅献彩   

  1. 南京大学化学系
  • 发布日期:1994-02-15

ESR studies on reduction of molyblotunstophosphoric acid

QI HAIHUA;YANG XIAOGEN;YAN QIJIE;FU XIANCAI   

  • Published:1994-02-15

合成了一个系列具有Keggin结构的磷钼钨杂多酸H~3PMo~1~2~-~nW~nO~4~0(n=0,3,6,9,11,12).用电子自旋共振(ESR)方法研究了这些杂多酸的还原性.结果表明,在还原态的杂多酸中,除了因失去桥氧产生的Mo^5^+信号A(其g~⊥^A=1.952, g~∥^A=1.852)外,钨取代后产生另一Mo^5^+信号B,其g~⊥^B=1.923,g~∥^B=1.877.该信号被认为是由于杂多酸中钼的端氧还原所致. 由此提出钨的取代影响了杂多酸的氧化还原性,即桥氧的稳定性相对增强,端氧的稳定性相对减弱

关键词: 磷酸 P, 氧化还原反应, 杂多酸, 电子自旋共振谱法, 钨酸 P, 钼酸, 笼形化合物, KEGGIN

Reduction of a series of known heteropoly acids with Keggin unit, H3PMo12-n WnO40(n = 0, 3, 6, 9, 11, 12) was studied by ESR. Reduction of these acids in hydrogen was investigated by ESR, and two signals were observed Substitution of Mo by W in the Keggin anion is suggested to affect the reduction mechanism.

Key words: PHOSPHORIC ACID P, OXIDATION REDUCTION REACTION, HETEROPOLYACID, ELECTRON SPIN RESONANCE SPECTROMETRY, TUNGSTIC ACID P, MOLYBDIC ACID

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