My sample contains anthracene derivative with a solvent means solvate, I have done SXRD there is no such pi--pi stacking but it showed red shift don't know how to explain. if someone have literature please share with me.
There can be many causes: red shift due to shift in the excited state potential compared to the ground state, shifts due to solvent relaxation, excited state reactions such as excited state proton transfer. There is much literature on each of these topics. You need to give more information in order for me to make an educated guess. Which derivative? which solvent or solvents? How much is the red shift? What is SXRD?
As well as solvatochromatic effects indicated by Gert, in solution, apparent red shifts can occur due to self-absprption in concentrated solutions - make sure you are operating at low enough concentrations
What kind of anthracene derivatives are you working on? Is there any typical functional group? These types of parameters might perturbe the emission of the anthracene unit. Also how is the shape of the emission spectrum? Is it a large band or a structurated one? The concentration is very important since anthrancene units might form aggregates (of different forms) or simply dimers which can be formed only under excitation (i.e the monomers are in the excited state).
I measure solid state fluorescence not in solution, In fact its a pyrazole having anthracene and nepthlene branches on either sides, I put the same compound in CHCl3 to study fluorescence, and wavelength shift to longer wavelength compae to the solvent free compounds careful study showed there is no face face pi stacking also in the original compounds there is no face-face interaction, don't know how to explain it
I think we need more information to help you with an explanation. Why don't you show us your molecule, and some of the spectra? I assume nephtlene is naphthalene? And as Adela Nano also indicated, don't forget to mention the concentration.
may i know what is the reason if there is a red shift in the wavelength of CT complex in solid fluorescence
Strong pi-pi interaction is the main cause for red shift in CT complexes
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