An unusual Li-Na-β-octamolybdate(VI) sandwiched by dinuclear organomolybdenum(V) units

The reaction of [MoO2(acac)2] (acac = acetylacetonate) with the dilithium salt of N-(2-mercaptophenyl)-2′-picolinamide (H2N2S) in the presence of Na+ yielded the MoVI complex [MoO2(N2S)] · 2THF along with the β-octamolybdate [MoVI8O26]4−, stabilised by two [Li(thf)3]+ linking to two terminal oxo groups of the cluster, and two Na+, each linking to four terminal oxo groups of octamolybdate and three acetato (ac) ligands of {[Li(thf)2(ac)]2[(acac)MoVO(μ-O)2(μ-ac)MoVO]} units, sandwiching the octamolybdate. Along with this structurally characterised cluster system, [MoO2(N2S)] was isolated. The preparation of the ligand H2N2S afforded a novel dithioacetal and urea derivative.