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The crystal structures of trans-(Ph 4 P) 2 [OsO 2 (ox) 2 ] (monoclinic, space group P2 1 /n, a = 12.281(2), b = 14.5440(13), c = 13.9810(12) Å, β = 100.000(8)°, Z = 2) and trans- (n-Bu 4 N) 2 [OsO 2 (mal) 2 ] (triclinic, space group P1̄, a = 10.365(4),b = 10.707(3), c - 11.473(5) A, a = 73.00(2), β = 64.44(3), 7 = 82.55(3)°, Z = 1) have been determined by single crystal X-ray diffraction analysis. The IR and Raman spectra of these complexes were measured at room temperature. Based on the molecular parameters of the X-ray determinations normal coordinate analyses have been performed and the vibrations assigned. The valence force constants of [OsO 2 (ox) 2 ] 2-  are f d (Os=O) = 6.7, f d (Os-O) = 2.9, f d (C-O) = 5.05, f d (C=O) = 11.2 and f d (C-C) = 4.7 mdyn/Å and of [OsO 2 (mal) 2 ] 2-  f d (Os=O) = 6.7, f d (Os-O) = 2.9, f d (C-O) = 4.86, f d (C=O) =11.1 and f d (C-C) = 4.07 mdyn/Å.

zeitschrift für naturforschung b

Kristallstrukturen, Schwingungsspektren und Normalkoordinaten- analysen von trans-[OsO 2 (ox) 2 ] 2–  und trans-[OsO 2 (mal) 2 ] 2– / Crystal Structures, Vibrational Spectra and Normal Coordinate Analyses of trans-[OsO 2 (ox) 2 ] 2–  and trans -[OsO 2 (mal) 2 ] 2–