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Effect of temperature on the photophysics of rhodamine 101 in a polar solvent

✍ Scribed by Francesco Barigelletti

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
358 KB
Volume
140
Category
Article
ISSN
0009-2614

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✦ Synopsis

The absorption and emission properties of rhodamine 101 in polar, aprotic propionitrile-butyronitrile (45 v/v) solvent have been investigated. The equilibrium between the neutral zwitterionic and lactonic (colourless) forms is strongly affected by the temperature in the range 293-144 K. In dilute solution ( 1.12 x 1 O-' M) , at room temperature the lactonic form is 98%, whine at 144 K the zwitterionic form predominates, being 79%. These findings are discussed in terms of differential stabilization of the lactonic and zwitterionic forms through non-specific solute-solvent interactions involving the COO-group.

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