摘要
通过UV-Vis光谱和氧电极实验证明2,3-二氨基丙酸(DAPA)钴(Ⅱ)配合物在水溶液中具有良好的吸氧性能和吸氧-放氧可逆性.根据配合物光谱随pH值变化的pH-A曲线可知,该配合物在pH值高于6.5后发生氧合反应,在pH=7.0～10.0范围内生成稳定的形态;在pH=8时用等摩尔比法及量气法对氧合配合物的组成比进行了测定,得出n(Co)∶n(DAPA)∶n(O2)=1∶2∶1;在波长384 nm和pH=7.0条件下,利用UV-Vis光谱考察了配合物在室温、水溶液中的吸氧-放氧反应动力学,结果表明,该配合物在85 h内连续吸氧-放氧可逆循环150次后仍具有5%的氧合能力.
Oxygenation property and reversibility of 2,3-diminopropanoic acid were continuously determined by means of UV-Vis spectrophotometry under alternating O2 or N2 atmospheres and oxygen electrode.The results show that the reversibility of the complex is excellent in aqueous solution at room temperature.Oxygenation reaction took place at pH=6.5 system and formed a stable species in a pH range of 7.0—10.0 according to pH-A curve.The component of oxygenation species was n（Co）∶ n（DAPA）∶ n（O2）=1∶ 2∶ 1 which was confirmed by equimolar ratio and gas volumetric method.UV-Vis spectra were recorded at 384 nm and room temperature in pH=7.0 aqueous solution.The results show that 5% of its original oxygenation capacity is still remained after DAPA-Co（Ⅱ） continuously undergoes 150 oxygenation-deoxygenation cycles in 85 h.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第7期1370-1375,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20762009,20961010,21162027)资助
