Liang Shu-Xuan, Zhao Li-Xia, Zhang Bo-Tao, Lin Jin-Ming
Department of Chemistry, Tsinghua University, Beijing, China.
J Phys Chem A. 2008 Jan 31;112(4):618-23. doi: 10.1021/jp0761822. Epub 2008 Jan 4.
Chemiluminescence (CL) phenomena of carbonates or bicarbonates of potassium, sodium, or ammonium with hydrogen peroxide in the presence of cobalt sulfate were reported. After cobalt(II) solution was injected into the mixture of carbonate/bicarbonate and hydrogen peroxide, a CL signal was given out briefly. The CL conditions of these systems were optimized. The CL reaction mechanisms were studied experimentally by examining the spectrum emitted by the CL system and the effect of various free radical scavengers on CL emission intensity. The results showed that the maximal emission wavelengths of the CO32--H2O2-Co2+ and HCO3--H2O2-Co2+ systems were 440 and 490 nm, respectively. As a result, a radical scavenger of ascorbic acid, thiourea, and superoxide dismutase exhibited different effects on these CL systems. The different CL mechanisms involving the carbon dioxide dimer and the oxygen dimer were revealed, respectively.
据报道，在硫酸钴存在的情况下，钾、钠或铵的碳酸盐或碳酸氢盐与过氧化氢会发生化学发光（CL）现象。将钴（II）溶液注入碳酸盐/碳酸氢盐与过氧化氢的混合物中后，会短暂发出CL信号。对这些体系的CL条件进行了优化。通过检查CL体系发射的光谱以及各种自由基清除剂对CL发射强度的影响，对CL反应机理进行了实验研究。结果表明，CO32--H2O2-Co2+和HCO3--H2O2-Co2+体系的最大发射波长分别为440和490 nm。因此，抗坏血酸、硫脲和超氧化物歧化酶等自由基清除剂对这些CL体系表现出不同的影响。分别揭示了涉及二氧化碳二聚体和氧二聚体的不同CL机理。
