The reaction of 3--perylenylmethylen--4'--ethylaniline (1) The X--ray structures of 4, 6, and 7 show that the perylenyl fragment remains essentially flat in 4 and 6 and slightly twisted in 7. Comparison of the optical properties of these Pt II complexes with those reported for similar Pd II derivatives reveals that the change of metal exerts a notable influence on the Vis--UV spectra. In solution at room temperature, all the Pt complexes, exhibit fluorescence associated to the perylene fragment with low emission quantum yields for the Pt II complexes (< 1%) and remarkably higher emision values for the Pt IV complexes: up to 29%, with emission lifetimes 1-5 ns.Time--dependent density functional theory (TD--DFT) calculations were performed to analyse the absorption spectra of the perylene imine, and representative complexes [M(C^N)(acac)] (M = Pd, Pt) and [Pt(C^N)(acac)MeI], which support a perylene--dominated intraligand π-π*emissive state, based on the HOMO and LUMO orbitals of the perylene chromophore, and a ligand--to--ligand charge--transfer (more intense for the Pt II complex) that explains the observed influence of the metal on the absorption properties.

Perylenyl isocyanide metal complexes exhibit a high perylene based fluorescence modified by weak electronic interaction of the metal and the perylene orbitals.

The perylene derivative 2-(3-perylenyl)-4-methylpyridine (HPerPy) was prepared and used to synthesize [Ag(HPerPy)(PPh3)(OClO3)], with the perylene ligand bonded to the metal centre only by the pyridine nitrogen. Treatment of HPerPy with...