195Pt-NMR-spektroskopischer Nachweis gemischter Hexahalogenodiplatinate(II), [Pt2ClnBr6 − n]2−, n = 0 – 6

¹⁹⁵Pt NMR Spectroscopic Evidence of Mixed Hexahalogenodiplatinates(II), [Pt₂Cl_nBr_{6 ? n}]^2?, n = 0 – 6 The complete system of the mixed complex ions [¹⁹⁵Pt₂Cl_nBr_{6 – n}]^2?, n = 0 – 6, is formed by stirring a suspension of the tetrabutylammonium salt(TBA)₂[¹⁹⁵PtCl₄] in an aqueous solution of KBr at 80°C. The mixture recrystallized from acetone/diethyl ether contains the 24 possible species, 12 with two equivalent ¹⁹⁵Pt atoms resulting in 12 singlets and 12 with inequivalent ¹⁹⁵Pt atoms resulting in 24 dublets. The expected 60 signals are really observed in the high resolution 1D-¹⁹⁵Pt-nmr spectrum. Using characteristic increments of chemical shifts, differentiating ²J(¹⁹⁵Pt ? ¹⁹⁵Pt) coupling constants and a 2D-¹⁹⁵Pt/¹⁹⁵Pt-COSY spectrum the complete and unambiguous assignment of all resonances is achieved. The presence of all components including the geometric isomers and their distribution derived from measured intensities reveal the statistical formation.