کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1235605 | 1495270 | 2012 | 5 صفحه PDF | دانلود رایگان |

The thermohalochromic behavior of Reichardt’s ET(30) betaine – the temperature-dependent variation of its halochromic band in the presence of a cation – was investigated for the first time in NaI solutions of HBD- (methanol, ethanol, 1-propanol, 1-butanol) and non-HBD-solvents (acetonitrile, dimethylformamide) at 15 and 55 °C. The solvent-dependent thermohalochromism of the pyridinium-N-phenolate betaine dye was interpreted in terms of the effect of the temperature on the dye–cation association in solution.
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► The halochromism of the ET(30) dye is affected by temperature in what is termed thermohalochromism.
► The phenomenon was studied for the first time in NaI solutions of the ET(30) dye in HBD- and non-HBD-solvents.
► A rise in temperature may increase or decrease halochromic shifts, leading to a positive or negative thermohalochromism.
► The effect depends on the solvent, reflecting salt–dye, solvent–salt and dye–solvent interactions.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 98, December 2012, Pages 18–22