Monosubstituierte Derivate des Halbsandwich-Komplexes Cp*Ta(CO)4

Monosubstituierte Derivate des Halbsandwich-Komplexes Cp*Ta(CO)

Ð Vergleich mit den analogen Vanadiumverbindungen Cp*V (CO)

L und

Röntgenstrukturanalyse des γ -Picolin-Komplexes Cp*V(CO)

(NC

H

-Me(4))

Monosubstituted Derivatives of the Halfsandwich Complex Cp*Ta(CO)

Comparison with the Analogous Vanadium Compounds Cp*V(CO)

L and X-Ray Structural Analysis of the

-Picoline Complex Cp*V(CO)

(NC

H

-Me(4)) Max Herberhold*, Gudrun Frohmader, Jürgen Peukert und Wolfgang Milius

Frau Professor Marianne Bandler zum 80. Geburtstag gewidmet Sonderdruckanforderungen an Prof. Dr. M. Herberhold.

E-mail: Max.Herberhold@uni-bayreuth.de

Z. Naturforsch.55 b,1188Ð1194 (2000); eingegangen am 21. August 2000 Halfsandwich Complexes, Carbonylmetal Compounds, Photoreactions

The photo-induced substitution of a CO ligand in Cp*Ta(CO)4(1) has been used to pre- pare a series of Cp*Ta(CO)₃L (2) complexes, in which the two-electron ligand L includes, e.g., isonitriles, sulfanes, cyclic ethers, phosphanes and pyridines. The complexes (2aÐy) were characterized by their ν(CO) frequencies and their ¹H and ¹³C NMR spectra, and were comparedÐ if possibleÐwith the correspondingvanadium complex, Cp*V(CO)4(3) and its derivatives, Cp*V(CO)3L (4). The molecular structure of the 4-picoline complex Cp*V(CO)₃(NC₅H₄-Me(4)) (4r) has been determined by X-ray crystal structure analysis.