Komplexchemie Polyfunktioneller Liganden. XXXIII. IR-, FIR- und RAMAN-Spektroskopische Untersuchungen an Metalltricarbonylderivaten mit vierzähnigen P- und As-Liganden im Bereich 2000–150 cm−1

Complex Chemistry of Polyfunctional Ligands. XXXIII. IR, FIR and Raman-Spectroscopic Studies on Metaltricarbonyl Derivatives of Tetradendate P- and As-Ligands in the Region 2000–150 cm^?1 The IR- (2000–250 cm^?1), FIR- (350–150cm^?1) and RAMAN -spectra (2000–150 cm^?1) of the tetradendate ligands C[CH₂E(C₆H₅)₂]₄ (E = P, As) and of the complexes of the type cis-M(CO)₃(R₂ECH₂)₃C(CH₂ER₂) (M = Cr, Mo, W; E = P, As; R = C₆H₅) have been obtained. A comparison of the spectra of these compounds and consideration of previously reported data of analogous compounds allowed the assignment of all ligand vibrations. After localisation of the ligand vibrations an assignment of the v (CO) (A₁ + E), δ (MCO) (A₁ + 2E, v (MC) (A₁ + E) and v (ME) (A₁) modes was possible for the coordination polyhedra cis-M(CO)₃)E₃ (point group C_3v). The v(ME) (E) modes were unobserved by its very low frequency.