Chlorine reaction with platinum triamine [Pt(N,N-DimeTm)PyCl3]Cl (N,N-DimeTm = (CH3)2N(CH2)3NH2). Crystal structure of [Pt(N,N-DimeTm)Cl2], [Pt(N,N-DimeTm(Py)Cl3]Cl • H2O and [Pt{(CH3)2N(CH2)2C(O)NH}(Py)Cl3]

Treatment of platinum(II) diamine [Pt(N,N-DimeTm)Cl-2] (I) with pyridine gave tetramine [Pt(N,N-DimeTm)Py-2]Cl-2 (II); by oxidation with chlorine this was converted to Pt(IV) triamine, [Pt{(N,N-DimeTm(Py)Cl-3]Cl (III) with a six-membered chelate ring. According to X-ray diffraction data, the reaction of complex II with chlorine is accompanied by removal of the pyridine molecule from the trans-position to the NH2 group of N,N-dimethyltrimethylenediamine. The reaction of complex III with chlorine at 20 degrees C afforded a mixture of compounds (IV) and the complex [Pt{(CH3)(2)N(CH2)(2)C(O)NH}(Py)Cl-3] (V) with an amidate six-membered metal ring, dimethylpropioamide, which was also isolated upon refluxing a mixture of IV in an aqueous solution. The UV/Vis and IR spectra of the obtained complexes were studied, and X-ray diffraction analysis of I, III, and V was performed. The crystals of I are triclinic, space group P (1) over bar; a = 7.6526(4) angstrom, b = 11.5571(6) angstrom, c = 12.4432(7) angstrom, alpha = 113.85(1)degrees, beta = 96.54(2)degrees, gamma = 106.78(2)degrees; Z = 4; R-hkl = 0.051. The crystals of III are monoclinic, space group C2/c; a = 36.715(2) angstrom, b = 7.8179(4) angstrom, c = 29.721(16) angstrom, beta = 127.80(1)degrees; Z = 16; R-hkl = 0.036. The crystals of V are monoclinic, space group P2(1)/n; a = 7.0398(6) angstrom, b = 27.458(2) angstrom, c = 7.687(6) angstrom, beta = 106.270(1)degrees; Z = 4; R-hkl = 0.052.