Formylhydrazine (FH) reacts with H2PtCl6 in EtOH forming a new complex with the general formula, [Pt(FH.HCl)2Cl3(EtOH)]Cl.1/2EtOH. Tribochemical reaction of this complex with alkali and alkaline earth halides (KBr, KI and CaI2) affords novel Pt (IV) complexes with the general formulae, [Pt(FH)2Br4]3/2EtOH, [Pt(FH)2I2(EtOH) (H2O)1/2]I2 and [Pt(FH)2I2(EtOH)3/2]I2. The tribochemical reactions are always accompanied by color changes, substitution of chloride by bromide and/or iodide ions but no reduction for Pt(IV) has been occurred during grinding with KBr, KI and/or CaI2. In all complexes the ligand (FH) coordinates to the Pt(IV) ion in a monodentate manner via the NH group. All the results suggest the existence of an octahedral geometry around the Pt(IV) complexes. The stereochemistry of the Pt(IV) complexes has been determined from the results of elemental analyses, conductance, spectral (IR., UV-Vis., 1H-NMR), thermal (DTA, TGA) and magnetic measurements.