The dinuclear heterometallic complex [(CN)(3)Pt(mu -CN)Cu(NH3)(4)] has been obtained in the solid state, and its structure has been determined by X-ray diffraction techniques at two temperatures (102 and 233 It). C4H12CuN8- Pt crystallizes in the orthorhombic system, with a = 14.554(3) Angstrom, b = 7.1901(12) Angstrom, c = 10.369(2) Angstrom, and V = 1085.1(3) Angstrom (3) at 102 K (a = 14.5091(10) Angstrom, b = 7.2739( F) Angstrom, c = 10.4570(7) Angstrom, and V = 1103.61(12) Angstrom (3) at 233 K), in space group Pnma, with Z = 4. The Pt and Cu atoms are linked by a CN bridge that presents a very bent C=N-Cu angle (120.1(6)degrees at 102 K). The C=N and N-Cu distances at 102 K are 1.147(10) and 2.394(7) A, respectively. [(CN)(3)Pt(mu -CN)Cu(NH3)(4)] is embedded in an extensive electrostatic net formed by (N)H...N(C) interactions which, it is concluded, play an important role in the extreme deviation from linearity observed for the C=N-Cu angle.