Darstellung und spektroskopische Charakterisierung der Nona-halogenodiiridate(III), [Ir2X9]3−, X=Cl, Br

作者: H.-J. Steinebach , W. Preetz

DOI: 10.1002/ZAAC.19855301118

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摘要: Die Nonahalogenodiiridate(III), A3[Ir2X9] (A = K, Cs, Tetraalkylammonium; X Cl, Br), sind in reiner Form dargestellt worden. Sie bilden sich aus den monomeren Hexahalogenoiridaten(III), die durch Ligandenabspaltung wenig polaren organischen Losungsmitteln zu flachenverknupften Dioktaedern verbrucken. IR- und Ramanspektren zeigen Banden drei charakteristischen Frequenzbereichen; bei hohen Wellenzahlen Valenzschwingungen mit terminalen Liganden ν(Ir−Clt): 360−300, ν(Ir−Brt): 250−220; im mittleren Bereich verbruckenden ν(Ir−Clb): 290−235, ν(Ir−Brb): 205−190 cm−1; Deformationsschwingungen werden deutlich niedrigeren Frequenzen beobachtet. Der Abstand zwischen ν(Ir−Xt) ν(Ir−Xb) nimmt abnehmender Grose der Kationen zu. an dunnen Filmen reinen Komplexsalze 10 K registrierten Elektronenspektren UV-Bereich einige intensive Charge-Transfer-Ubergange, sichtbaren Gebiet ein oder zwei schwache dd-Banden. Preparation and Spectroscopic Characterization of Nonahalogenodiiridates(III), [Ir2X9]3−, Br The pure nonahalogenodiiridates(III), tetraalkylammonium; Br) have been prepared. They are formed from the monomer hexahalogenoiridates(III) which bridged to confacial bioctahedral complexes by ligand abstraction less polar organic solvents. The IR Raman spectra exhibit bands three characteristic regions; at high wavenumbers stretching vibrations with terminal ligands a middle region bridging deformation observed distinct lower frequencies. distance between increases decreasing size cations. electronic measured thin films complex salts show some charge transfer transitions UV one or two weak dd visible region.

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