Please see my answer in the file below:

 Aspartic acid can coordinate to metal through two oxygen and one nitrogen atoms acting as tridentate ligans while quecetine is a bidentate .

Please see newly edited file below:

Greetings. Firstly, I consider to prepare the mixed ligand coordination compound in one pot, but take into account the charge of the system since in different ways you could obtain neutral or charged substances. Aspartic acid can act as 5 or 6 member chelating agent using carboxylate as covalent and amine as dative bonds respectively. In the case of quercetine it can also act as 5 or 6 member chelating agent but in this case it will act as acetyacetonate moiety. In this condition it should be useful to employ cobalt (II) nitrate hexahydrate as the source of cobalt. In this way you should prepare a mixed ligand compound more or less of the following composition, you should notice that the compound that I am presenting is the 5-5 dichelate but this could vary from 5-6, 6-5 or 6-6. To obtain the desired compound you should try room temperature stirring, reflux of employed solvents or solvothermal, the latter two normally would provide the themodynamic product. Best regards and good reactions. Hiram