Abstract
The chlorination of an aqueous solution of [PtpnPy2Cl2]Cl2 affords the platinum(IV) dichloroamine complex [PtPy2(NCl2)2Cl2](I), as the major reaction product formed due to the complete destruction of the five-membered chelate ring. Complex I is obtained in the pure state from acetonitrile. In addition, the [PtPy(NH2-CH(CH3)-CH(CH3)-NH2)Cl3]Cl · 1/2 H2O complex (II) is isolated from the mother liquor upon chlorination. Complex I reacts rapidly with concentrated HCl to form the tetramine complex [PtPy2(NH3)2Cl2](CF3SO3)2 · 1/2 H2O(III). The X-ray diffraction study is carried out for complexes I, II, and III. Complex I crystallizes in the monoclinic crystal system: space group C2/c, a = 7.4529(4), b = 15.2143(9), c = 14.9965(8) A, β = 99.866(1)°, V = 1675.3(2) A3, Z = 4; Rhkl = 0.040. The crystals of complex II are triclinic: space group P\( \bar 1 \) , a = 8.163(2), b = 8.656(2), c = 10.638(2) A, α = 78.30(3)°, β = 83.95(3)°, γ = 84.68(3)°, V = 730.0(3) A3, Z = 2; Rhkl = 0.026. The crystals of complex III are monoclinic: space group C2/c, a = 11.946(2), b = 19.624(4), c = 10.034(2) A, β = 95.96(3)°, V = 2339.5(8) A3, Z = 4; Rhkl = 0.043. The IR spectra of all the compounds synthesized are studied.
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