Spectroscopic and thermodynamic studies of 7-diethylamino-coumarin-3-carboxylic acid in interaction with β- and 2-hydroxypropyl-β-cyclodextrins

► Estimation of stoichiometry and association constants at pH = 7.4 by spectral methods. ► Evidence of the TICT excited state by emission changes upon inclusion. ► Characterisation of the inclusion mode by circular dichroism and TDDFT calculations. ► Caracterisation of the complexes in solid state by DSC and Raman experiments.