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By reaction of (n-Bu 4 N) 2 [Pt(ox) 2 ] with elemental halogens in dichloromethane the complexes trans-[PtX 2 (ox) 2 ] 2-  (X = Cl, Br, I) are formed. The crystal structures of trans-(py 2 CH 2 )[PtCl 2 (ox) 2 ] · C 4 H 6 O 3  (1) (monoclinic, space group P2 1 /n, a = 12.119(3), b = 14.926(2), c = 12.666(4) Å, β = 91.26(3)°, Z = 4), trans-(py 2 CH 2 )[PtBr 2 (ox) 2 ] (2) (monoclinic, space group P2 1 /n, a = 7.402(8), b = 16.997(3), c = 14.898(3) Å, β = 98.15(3)°, Z = 4) and trans-(py 2 CH 2 )[PtI 2 (ox) 2 ] ·C 3 H 7 NO (3) (orthorhombic, space group Pnma, a = 10.380(9), b = 13.973(2), c = 17.440(4) Å, Z = 4) have been determined by single crystal X-ray diffraction analysis. Highly resolution IR and Raman spectra were measured at low temperature (10 K). Using the molecular parameters of the X-ray determinations normal coordinate analyses based on a modified valence force field have been performed and the normal modes of vibration are assigned. The valence force constants are f d (PtCl) = 2.19, f d (PtBr) = 1.68, f d (PtI) = 1.28 mdyn/Å and f d (PtO) ranges from 2.71 to 2.82 mdyn/Å. The observed  195 Pt NMR shifts are δ( 195 Pt) = 6472.4 (X = Cl), 6027.1 (Br) and 5142.7 ppm (I).

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Kristallstrukturen,  195 Pt-NMR-Verschiebungen, Schwingungsspektren und Normalkoordinatenanalysen von trans-Dihalogeno-bis(oxalato)platinaten(IV), trans-[PtX 2 (ox) 2 ] 2- , X = Cl, Br, I / Crystal Structure,  195 Pt NMR Chemical Shifts, Vibrational Spectra, and Normal Coordinate Analyses of trans-Dihalogeno-bis(oxalato)platinates(IV), trans-[PtX 2 (ox) 2 ] 2- , X = Cl, Br, I