Photochromism and Electrospray Mass Spectrum of the Ternary Europium System with Nicotinic Acid and 1,10-Phenanthroline |
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| Authors: | X J Zheng L P Jin Y H Mei L G Zhu |
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| Institution: | 1. Department of Chemistry, Beijing Normal University, Beijing, 100875, People's Republic of China
2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, Jiangsu, 210093, People's Republic of China
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| Abstract: | A novel photochromic system of europium with nicotinic acid (HL) and 1,10-phenanthroline (phen) was studied. The color of the system turns from yellow to green with a broad absorption band appearing in the range 550–830 nm under the irradiation by a mercury lamp. The pH value of the system plays an important role in the photochromic behavior. It is observed that a higher pH value is favorable to photochromism. With electrospray ionization mass spectrometry (ESIMS), we probed the possible species present in the aqueous solution. It was concluded that the complex EuL3(phen)2 · H2O exists in the solution. To better understand its ESI mass spectrum, we give the possible fragmentation of EuL3(phen)2 · H2O. |
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