Abstract:
Pyridyl azafluoranthene ligand (LH, 2) was prepared by a Diels-
Alder cycloaddition reaction between 2-cyanopyridine and bis(4-tertbutylphenyl)-
8H-cyclopenta[l]acenaphthylen-8-one (1). Treatment of (2)
with [PtCl2(dmso)2] (dmso = dimethyl sulfoxide) in the presence of
triethylamine in chloroform afforded the cyclometallated square-planar
platinum(II) complex [(L)PtCl] (3) containing an anionic terdentate
(C^N^N) ligand. The reaction of (2) with 0.5 equivalent of [(η3-
methallyl)Pt(μ-Cl)]2 in dichloromethane and subsequent addition of
NH4PF6 in methanol resulted in the formation of the salt[(η3-
methallyl)Pt(2)]PF6 (4). The chloride ligand in (3) can be replaced by
iodide and trifluoroacetate to yield [(L)PtI] (5) and [(L)PtO2CCF3] (6),
respectively. Treatment of (3) with HC≡CC6H4But-4 in the presence of
triethylamine and CuI yielded the acetylide [(L)PtC≡CC6H4But-4] (7).
Treatment of (3) with PPh3 in dichloromethane and subsequent addition
of NH4PF6 in methanol gave the salt [(L)Pt(PPh3)]PF6 (8). Similarly, the
salt [(L)Pt(DMAP)]PF6 (9) was prepared by the reaction between (3)
and 4-dimethylaminopyridine (DMAP). All the complexes were
characterized by elemental analysis, IR, Mass and NMR spectroscopy
