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The treatment of K 2 [OsO 2 (OH) 4 ] with oxamide in aqueous solution yields [OsO 2 (N 2 H 2 C 2 O 2 ) 2 ] 2- . The crystal structure of trans-(Ph 4 P) 2 [ OsO 2 (N 2 H 2 C 2 O 2 ) 2 ]·CH 2 Cl 2  (triclinic, space group P1̅, a = 10.447(1), b = 14.102(4), c = 16.962(2) Å, a = 90.037(1), β = 90.633(7), γ = 98.812(2)°, Z = 2) has been determined by single crystal X-ray diffraction analysis. The IR and Raman spectra were measured at room temperature. Based on the molecular parameters of the X-ray determination a normal coordinate analysis has been performed and the vibrations are assigned. The valence force constants are f d (Os=O) = 6.7, f d (Os-N) = 2.4, f d (C-N) = 4.9, f d (C=0) = 11.15 and f d (C-C) = 4.7 mdyn/Å.

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Darstellung, Kristallstruktur, Schwingungsspektren und Normalkoordinatenanalyse von trans-[OsO 2 (N 2 H 2 C 2 O 2 ) 2 ] 2-  / Synthesis, Crystal Structure, Vibrational Spectra, and Normal Coordinate Analysis of trans-[OsO 2 (N 2 H 2 C 2 0 2 ) 2 ] 2-