铅烷发生反应的非新生态氢机理

文章采用流动注射氢化物发生-石英管电热原子化-原子吸收光谱法检测实验系统,检测铅烷发生反应中反应物的量和产生的铅烷的量之间的关系,以阐明K2Cr2O7体系铅烷发生的机理。实验结果表明,反应体系中酸首先与NaOH发生中和反应,随后过量的酸参与KBH4和K2Cr2O7的氧化还原反应(消耗的酸与KBH4摩尔比为一常数9.95±0.42)。铅烷发生反应与氧化还原反应同步发生,且产率随酸量的增加而增加的实验结果表明:铅烷发生反应是由氧化剂和硼氢化钾之间的氧化还原反应所诱导的。至此,证实ⅣA族Ge,Sn,Pb的氢化物发生反应都是非新生态氢机理。

Non-Nascent Hydrogen Mechanism of Plumbane Generation

The mechanism of plumbane generation in dichromate system was studied via investigation of the relationship between the plumbane yield and the molar number of the reactants. A flow injection hydride generator was used in the study. Reactant moler number was calculated by the injected volume and the reactant concentration, and the plumbane yield was measured via an AAS spectrometer equipped with an electrothermal quartz tube atomizer. Experimental results show that the acid was first used for the neutralization of NaOH and successively participated in the redox reaction of borohydride with dichromate with a constant molar ratio of 9.95 +/- 0.42 (expressed in terms of mean +/- standard deviation). At the same time, plumbane generation was displayed as synchronously taking place with the redox reaction, and the yield increased with the increase of acid. The mechanism of plumbane generation was thus deduced as an induced reaction or a catalytic reaction by the redox reaction. Up to this end, the non-nascent hydrogen mechanism of hydride generation has been verified for all the IVA elements.