Übergangsmetall-Carbin-Komplexe LXXXVII. Synthese neuer, thermisch stabiler, kationischer Diethylaminocarbin-Komplexes des wolframs

trans-I(CO)₂L₂WCNEt₂ complexes (L₂ = 2,2′-bipyridyl (2,2′-bipy); 1,10-phenanthroline (ophen)) react with PR₃ (R = Me, Et) and thus undergo substitution of the iodine ligand by the phosphine to yield the new, thermostable, cationic carbyne complexes, [(PR₃)(CO)₂L₂WCNEt₂]⁺ I⁻. The ionic character of the compounds has been established from electrical conductivity studies of their solutions. Spectroscopic investigations of the complexes, whose composition has been determined by elemental analysis, indicate that in this reaction the halogen ligand in the trans position has been displaced by the chelate ligand, while the phosphine ligand occupies a cis coordination site, relative to carbyne moiety.