Ligandenfeldspektroskopische Untersuchungen an Übergangsmetall -Aluminium -Tetraalkoxiden / Ligand Field Spectroscopic Studies of Transition Metal Aluminium-Tetraalkoxides

Abstract

The preparation and the electronic spectral properties of compounds M[Al(OR)₄]₂ (M = Co, Ni, Cu and R = CH₃, C₂H₅, n-C₃H₇, n-C₄H₉) are described. The spectral data are used in conjunction with ligand field theory in deducing the structures of the compounds. The spectrum of green Ni[Al(OR)₄]₂ is interpreted as a Ni(OR)₆ octahedron sharing faces with two Al(OR)₄ tetrahedrons. It is proposed that Co ²⁺ and Cu ²⁺ are in a distorted octahedral coordination. The alkoxide ligands have been fitted into the spectrochemical and the nephelauxetic series. They are close to H₂O in this series.