The missing link in the series [L2MIII2(µ-O)(µ-MeCO2)2]2+(M = Ti, V, Cr, Mn, Fe). Synthesis, crystal structure and magnetism of [L2CrIII2(µ-O)(µ-MeCO2)2][BPh4]2

Abstract

Reaction of pink [L₂Cr₂(µ-OH)(µ-MeCO₂)₂][ClO₄]₃ in MeCN with NEt₃ and addition of Na[BPh₄] affords deep blue crystals of [L₂Cr₂(µ-O)(µ-MeCO₂)₂][BPh₄]₂(L = 1,4,7-trimethyl-1,4,7-triazacyclononane) the crystal structure of which reveals the presence of the µ-oxo-di(µ-acetato)-dichromium(III) core; weak intramolecular antiferromagnetic exchange coupling between the Cr^III ions has been established.