期刊
DYES AND PIGMENTS
卷 86, 期 3, 页码 206-216出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2010.01.005
关键词
Ionic salt; Imidazolium; Naphthalimide; Photostability; Quenching; Ionic liquid
资金
- Ege University and State Planning Organization of Turkey (DPT)
1,8-Naphthalimide groups containing imidazolium iodide salts of different alkyl chain length on the imidazole group were synthesized. Hexafluorophosphate and bis(trifluoromethanesulfonyl)imide salts were obtained by ion exchange reactions. The synthesized salts were characterized using a variety of spectroscopic techniques. Fluorescence emission quenching of iodide and bis(trifluoromethanesulfonyl) imide salts were studied using a ruthenium dye, whilst that of hexafluorophosphate salts were performed using tris(8-hydroxyquinoline)aluminum. Calculated fluorescence quenching rate constants were as high as 10(14)M(-1)s(-1) and values of the Gibbs free energy of electron transfer were [-32.04/-33.681],[-17.52/-20.741] and [-26.50/-30.89] kcal mol(-1) for the iodide, hexafluorophosphate and bis(trifluoromethanesulfonyl) imide salts, respectively. The thermal stability of the synthesized salts was high especially in the case of bis (trifluoromethanesulfonyl)imide salts for which values of 470-498 degrees C were achieved. Photostability studies of hexafluorophosphate and bis(trifluoromethanesulfonyl)imide salts were also performed: calculated photodegradation half-life values ranged from 19.25 to 48.12 h. (C) 2010 Elsevier Ltd. All rights reserved.
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