Dinuclear (2,2′:6′,2′′-terpyridine)platinum(II) (PtTerpy) complexes were synthesised by tethering either thiol or pyridine based linkers. All intermediates and resulting complexes were characterised using a combination of ¹H and ¹⁹⁵Pt NMR, two-dimensional ¹H correlation spectroscopy (NOSY/COSY), two-dimensional ¹H/¹⁹⁵Pt heteronuclear multiple bond correlation spectroscopy (HMQC), elemental analysis and electrospray ionisation mass spectrometry (ESI-MS). The cytotoxicity of the complexes was determined against human A2780 ovarian carcinoma cells and its cisplatin-resistant sub-line A2780cis, as well as L1210 murine leukemia cells.