Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1236328 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2006 | 6 Pages |
Abstract
Bathochromic shift in excitation spectrum was observed during emission measurement of Eu(DBM)3Phen containing dilute solution in methyl methacrylate (MMA). Detailed analysis shows that the reason of bathochromic shift is not the formation of molecule aggregation. It is caused by the intense absorption of ligands in the complex. Based on this model, a new method has been established to rectify excitation spectra before emission measurement of systems with different concentration. There exists a critical value of the absorption strength, which is 0.87 from calculation. Higher absorption than this value will cause the bathochromic shift of excitation peak. The wavelength whose absorbance is 0.87 will be the position of the strongest excitation peak. With 200 ppm and 500 ppm Eu(DBM)3Phen as the standard sample, relations between relative concentration and wavelength of excitation peak in Eu(DBM)3Phen system were deduced and plotted. Theoretical curves are in good agreement with experiment data except extra-dilute concentration, for partial decomplexation of the β-diketonate and phenanthroline ligands.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Hui Zhao, Wei Su, Yanhua Luo, Yaohui Ji, Zengchang Li, Hongfang Jiu, Hao Liang, Biao Chen, Qijin Zhang,