二(过碘酸)合银(Ⅲ)配离子氧化L-谷氨酰胺的

doi:10.3969/j.issn.1000-1565.2009.03.020

摘要/Abstract

摘要： 在碱性介质中,二(过碘酸)合银(Ⅲ)配离子 ([Ag(HIO6)2]5-) 氧化Gln导致脱羧与脱氨而生成H2NCOCH2CH2CHO,氧化的产物由化学方法和质谱鉴定.动力学实验表明,氧化反应为总二级,对Ag(Ⅲ)和Gln各为一级,表观二级速率常数随 [IO4-]tot增大而减小,随着离子强度的增大而增大,同[OH-]的变化几乎无关.所提出的反应机理包括[Ag(HIO6)2]5-与[Ag(HIO6)(OH)(H2O)]2-形成前期平衡;2种Ag(Ⅲ) 的形态被Gln平行还原并且均为速率控制步骤.根据反应机理,导出了速率方程和速控步的速率常数值,计算出了活化参数,对电子转移方式进行了详尽的讨论.

关键词: L-谷氨酰胺, Ag(Ⅲ), 氧化, 动力学与机理

中图分类号:

O643.12

申世刚,杜荣健,石红梅,郝增华,彭松. 二(过碘酸)合银(Ⅲ)配离子氧化L-谷氨酰胺的[J]. 河北大学学报(自然科学版), 2009, 29(3): 311-317.

SHEN Shi-gang,DU Rong-jian,SHI Hong-mei,HAO Zeng-hua,PENG Song. Oxidation of L-Glutamine by Bis(hydrogenperiodato)argentate(Ⅲ) Complex Anion:Kinetics and Mechanism[J]. Journal of Hebei University (Natural Science Edition), 2009, 29(3): 311-317.

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