Iron(III) and copper(II) complexes derived from the flavonoids morin and quercetin: Chelation, crystal structure and DFT studies

•Job's plot (method of continuous variance) analysis has been carried out which gives the chelation stoichiometry of the metal ions Cu(II) and Fe(III) to the flavonoids morin and quercetin.•For the first time a single crystal X-ray structure of iron(III) with a flavonoid (morin in this case) is obtained and discussed.•A comprehensive DFT study related to stability and to the crystal structure is carried out and complements all the results which have been obtained.