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By careful acidification of the aqueous solution of trans-K 2 [OsO 2 (OH) 4 ] in the presence of the required amount of cyanide ions with oxalic acid, malonic acid or oxamide the osmyl complexes trans-[OsO 2 (CN) 2 (ox)] 2-  (1), trans-[OsO 2 (CN) 2 (mal)] 2-  (2) und trans-[OsO 2 (CN) 2 (N 2 H 2 C 2 O 2 )] 2-  (3) are formed. The IR and Raman spectra of the (n-Bu 4 N) and (Et 4 N) salts of 1, 2 und 3 were measured at room temperature. Based on the molecular parameters of the X-ray determination of related complexes normal coordinate analyses have been performed and the vibrations were assigned. The valence force constants are f d (C≡N ) = 16.95, f d (Os=O) = 6.68 - 6.70, f d (Os-O) = 2.55 - 2.60, f d (Os-C) = 2.55 and f d (Os-N) = 2.30 mdyn/Å. For the chelate ligands, f d (C =0) ranges from 11.03 - 11.15, f d (C-O/N) from 4.86 - 5.05 and fd(C-C) from 4.07 - 4.70 mdyn/Å.

zeitschrift für naturforschung b

Darstellung, Schwingungsspektren und Normalkoordinatenanalysen der Dioxoosmate(VI) trans-[OsO 2 (CN) 2 (ox)] 2- , transs-[OsO 2 (CN) 2 (mal)] 2-  und trans-[OsO 2 (CN) 2 (N 2 H 2 C 2 O 2 )] 2-  / Synthesis, Vibrational Spectra and Normal Coordinate Analysis of the Dioxoosmates(VI) frans-[OsO 2 (CN) 2 (ox)] 2-  , trans-[OsO 2  (CN) 2 (mal)] 2-  and trans-[OsO 2  (CN) 2 (N 2 H 2 C 2 O 2 )] 2-