The trans [PtCl 4 (EtCN) 2 ] complex is involved in coupling reactions (CH 2 Cl 2 , 30-35 °C, 10-15 min) with 2 amino derivatives of heterocyclic compounds (2 NH 2 Het, where Het is pyridyl, 4 methylpyridyl, 5 methylpyridyl, 6 methylpyridyl, or thiazolyl) to form the trans [PtCl 4 {N(H)=C(Et)NHHet} 2 ] complexes (1-5) with κ 1 (N ) coordinated hetarylamidine ligands. The reaction with the use of 2 aminopyrimidine (2 NH 2 Pym) produces the [PtCl 4 (2 NH 2 Pym) 2 ] complex (6) as a result of complete replacement of the nitrile ligands in the [PtCl 4 (EtCN) 2 ] complex. The compositions and structures of compounds 1-6 were con firmed by elemental analysis (C, H, N), IR spectroscopy, 1 H, 13 C{ 1 H}, and 195 Pt{ 1 H} NMR spectroscopy, and FAB mass spectrometry. Complex 1 was additionally characterized by X ray diffraction.

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