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In this paper, the stereoselective homogeneous catalysis polymerization of phenylacetylene by using two kinds of catalysts W(CO)_5CH_3I and W(CO)_4I_2 produced from UV laser photolysis of W (CO)_6 in CH_3I, I_2—C_6H_6 and CHI_3—C_6H_6 respectively was studied. The effects of laser energy, laser irradiation time and lifetime of catalyst on the polymerization of phenylacetylene were discussed. The photoproducts of W (CO)_6 in CH_3I, I2—C_6H_6 and CHI_3—C_6I_6 were determined by IR spectra. The structures of polyphenylacetylene obtained by W (CO)_5CH_3I and W (CO)_4I_2 catalysts were characterized by IR spectra and ~1H NMR spectra. 相似文献
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苯芴酮-聚乙二醇辛基苯基醚分光光度测定金属锑中微量锡 总被引:1,自引:0,他引:1
本文研究了苯芴酮-聚乙二醇辛基苯基醚分光光度测定金属锑中微量锡的方法。实验表明,用酒石酸掩蔽锑,在(1M)硫氰酸铵-(0.4N)硫酸介质中,锡能定量地被乙酸乙酯萃取而与锑分离,26种可能存在的杂质元素经萃取分离后对测定无干扰。当室温低于16℃时,常用的苯芴酮-CTAB法容易析出沉淀,使比色测定难以进行。本法采用非离子表面活性剂OP代替CTAB,则无论室温高低都不会析出沉淀影响比色。 相似文献
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