Destruction of the propylenediamine ring upon the chlorination of the platinum(IV) tetramine complex [PtpnPy2Cl2]Cl2
摘要:
The chlorination of an aqueous solution of [PtpnPy(2)Cl(2)]Cl(2) affords the platinum(IV) dichloroamine complex [PtPy(2)(NCl(2))(2)Cl(2)] (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(NH(2)-CH(CH(3))-CH(CH(3))-NH(2))Cl(3)]Cl center dot 1/2H(2)O complex (II) is isolated from the mother liquor upon chlorination. Complex I reacts rapidly with concentrated HCl to form the tetramine complex [PtPy(2)(NH(3))(2)Cl(2)](CF(3)SO(3))(2) center dot 1/2H(2)O (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) angstrom, beta = 99.866(1)degrees, V = 1675.3(2) angstrom(3), Z = 4; R(hkl) = 0.040. The crystals of complex II are triclinic: space group P (1) over bar, a = 8.163(2), b = 8.656(2), c = 10.638(2) angstrom, alpha = 78.30(3)degrees, beta = 83.95(3)degrees, gamma = 84.68(3)degrees, V = 730.0(3) angstrom(3), Z = 2; R(hkl) = 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) angstrom, beta = 95.96(3)degrees, V = 2339.5(8) angstrom(3), Z = 4; R(hkl) = 0.043. The IR spectra of all the compounds synthesized are studied.