A series of novel platinum(II) complexes were isolated through the reaction of the polypyridyl ligands 2,3,7,8-tetra(2-pyridyl)pyrazino[2,3-g]quinoxaline (tpq), 2,3-di(2-pyridyl)pyrazine (dpp), 2,3-di(2-pyridyl)quinoxaline (dpq) and 6,7-dimethyl-2,3-di(2-pyridyl)quinoxaline (ddpq) with the heterobimetallic complex [Pt(dppf)(H₂O)₂](CF₃SO₃)₂ or with the dimethyl sulfoxide complex [Pt(Me₂SO)₂Cl₂]. The di-platinum complex [{Pt(dppf)}₂(tpq)](CF₃SO₃)₄ and the mono-platinum compounds [Pt(dppf)(L)](CF₃SO₃)₂ (L=dpp, ddpq) and [Pt(L)Cl₂] (L=dpq, ddpq) were synthesized. As shown by ¹H NMR spectroscopy, in these complexes the bridging tpq and the mononucleating ligands dpp, dpq and ddpq present an uncommon bidentate chelate mode; they are bonded to the Pt(II) centres only by the means of their pyridyl nitrogen atoms. This behaviour was corroborated through the X-ray crystallographic study of the [Pt(dpq)Cl₂] derivative. The redox properties of the three new dppf-based complexes, in dichloromethane solution, show in all cases that they undergo ferrocene-based (dppf) oxidations and that the primary cathodic processes are tpq-centered in the tpq complex and platinum(II)-centered in the dpp and ddpq complexes.