Molybdenum(V) Chloride Complexes with Aliphatic Diamines

Abstract

For the first time it has been possible to prepare complexes of Mo(V) with the following aliphatic diamines: 1,2 ethylenediamine (en), 1,3 trimethylenediamine (tn), 1,4 tetramethylenediamine (bn), 1,5 pen-tamethylenediamine (pn), 1,6 hexamethylenediamine (hn) and 1,8 octame-thylenediamine (on).

Analytical results show that all the complexes prepared correspond to the empirical formula [Mo₂Cl₂(AA)₈] Cl₈ where AA is the diamine. The measurement of paramagnetic susceptibilities underlines the diamag-netic nature of all the compounds. Thermogravimetric studies reveal very similar behaviour in all cases with the final formation of MoO₃. According to i.r. spectra, diamines act as monodentate ligands, and the Moatoms are bridged through chlorine ligands. Electronic spectra show no bands in the visible region.