Influence of the metal center on the morphology of coordination compounds thin films

Thin film morphology of tris-(8-hydroxyquinolate) aluminium (III) (Alq3) an d bis-(8-hydroxyquinolate) oxovanadium (IV) (VOq2) are compared. Alq3 films deposited onto mica at 300K look almost featureless, but dendrimers or ran domly distributed needle-shaped crystallites appear as a consequence of cry stallization in time. We show that a possible origin of this process is exp osure to solvent vapors. On the other hand, VOq2 films retain their texture d morphology as thickness increases because of stabilizing intermolecular i nteractions between vanadyl groups.