A new lindqvist-type hexamolybdate cluster functionalized with the jt-donor ligand 4-bromo-2,6-dimethylphenylimido. Spectroscopic, electrochemical and structural studies

A new ionic organic-inorganic hybrid complex of formula («-Bu ₄N)₂[Mo(_i0₁₈(NR)] ¹/2Me₂CO, R = -C₆H₂-2,6-Me ₂-4-Br, (w-Bu₄N)₂[l]-i4Me₂CO, has been prepared in acetonitrile by reacting tetrabutylammonium a-octamolybdate, («-Bu₄N)4[0t-Mo₈O₂₆], with 2,6-dimethyl-4-bromoaniline hydrochloride, 2,6-Me₂-4-Br-C ₆H₂NH₂HCl, using N,N′- dicyclohexylcarbodiimide, (C₆H_U)N=C=N(C₆H ₁₁), as dehydrating agent. This complex, formulated as («-Bu₄N)₂[l]¹/2Me₂CO, contains a C-Br group which can be functionahzed for constructing novel hybrid materials. The complex was fully characterized by IR, UV-Vis, 'H- and "C-NMR spectroscopies, and authenticated by single crystal X-ray diffraction analysis. The asymmetric unit contains two crystallographically independent anions, [l]²", differing by the orientation of the phenyl ring relative to the hexamolybdate skeleton, and one molecule of acetone. Both molecules differ in the angles Mo(l)-N(l)-C(l)= 172.2(6) and Mo(7)-N(2)-C(9)= 175.6(6)°. These angles, near to 180°, indicate the presence of a Mo=N triple bond.