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2—钨硼杂多酸虽为最早发现的杂多酸之一,但由于它很不稳定,难以合成、分离和分析,至今对它的了解远不如对钨钼,钨硅及磷钼等杂多酸那么清楚,虽然自D.Kien在1881年首先发现和制得两种结晶外形的钨硼酸,但对这两种异构体至今仍无权威性的意见,尤其是对六方晶系12—钨硼杂多酸的极谱性质未见报导,虽然近年来有人提出四方晶系12—钨硼杂多酸的普通极谱性质及还原产物的研究,但认为四方晶系和六方晶系两种异构体的极谱性质是重合的。本文研究了两种异构体的微分脉冲极谱和循环伏安,得出两种异构体微分脉冲极谱图各不相同,循环伏安图也各不相同,并且研究了六方晶系12—钨硼杂多酸浓度与其峰电流呈良好的线性关系,从而提出六方晶系12—钨硼杂多酸可用微分脉冲极谱法进行定量。
Although it is one of the earliest heteropoly acids found, 2-tungstophoric acid is far less stable, difficult to be synthesized, separated and analyzed. So far its understanding is far less than that of heteropoly acids such as tungsten, molybdenum, tungsten, molybdenum and molybdenum The polyacid is so clear that although two crystalline boronic acids were first discovered and prepared by D.Kien in 1881, there is still no definitive opinion on these two isomers so far, especially for hexagonal 12- Polarographic properties of tungstoboron heteropolyacid have not been reported, although in recent years it has been proposed that the general polarographic properties of the tetragonal 12-tungstoboron heteropolyacid and reduction products, but the tetragonal and hexagonal two The polarographic nature of the isomers is coincident. In this paper, the differential pulse polarography and cyclic voltammetry of two isomers were studied. The differential pulse polarograms of the two isomers were different and the cyclic voltammograms were also different. The effects of hexagonal system 12 - Tungstoboron heteropoly acid concentration and its peak current showed a good linear relationship, thus proposed hexagonal 12-Tung heteropoly acid can be used to quantify the differential pulse polarography.