文章基本信息

标题：Abnormal Magnetic Field Effects on Electrogenerated Chemiluminescence
本地全文：下载
作者：Haiping Pan ; Yan Shen ; Hongfeng Wang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep09105
语种：English
出版社：Springer Nature
摘要：We report abnormal magnetic field effects on electrogenerated chemiluminescence (MFE_ECL) based on triplet emission from the Ru(bpy)₃Cl₂-TPrA electrochemical system: the appearance of MFE_ECL after magnetic field ceases. In early studies the normal MFE_ECL have been observed from electrochemical systems during the application of magnetic field. Here, the abnormal MFE_ECL suggest that the activated charge-transfer [Ru(bpy)₃³⁺ … TPrA^•] complexes may become magnetized in magnetic field and experience a long magnetic relaxation after removing magnetic field. Our analysis indicates that the magnetic relaxation can gradually increase the density of charge-transfer complexes within reaction region due to decayed magnetic interactions, leading to a positive component in the abnormal MFE_ECL. On the other hand, the magnetic relaxation facilitates an inverse conversion from triplets to singlets within charge-transfer complexes. The inverse triplet → singlet conversion reduces the density of triplet light-emitting states through charge-transfer complexes and gives rise to a negative component in the abnormal MFE_ECL. The combination of positive and negative components can essentially lead to a non-monotonic profile in the abnormal MFE_ECL after ceasing magnetic field. Nevertheless, our experimental studies may reveal un-usual magnetic behaviors with long magnetic relaxation from the activated charge-transfer [Ru(bpy)₃³⁺ … TPrA^•] complexes in solution at room temperature.