Novel chalcogenide vanadium complexes with β-diimine ligand: synthesis and structural studies

Three new chalcogenide vanadium complexes with a beta-diketiminate ligand have been synthesized by reduction of the elemental chalcogens (S, Se, Te) with [(mu-eta(6):eta(6)-toluene){V(nacnac)}(2)] (1) (nacnac = HC(C(Me)NC6H3-Pr-i(2))(2)). The structures of the sulfide and selenide complexes [((nacnac)V = E)(2)(mu,n(2)-E-2)] (E = S (2), Se (3)) are similar; the chalcogenides act both as bridging (E-2(2-)) and terminal (E2-) ligands. In compound [V-2(mu-Te)(2)(nacnac)(2)] (4), all tellurium atoms are present only as bridging Te2- ligands. The compounds have been characterized by IR-spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The possibility of the formation of additional V = Te bonds in 4 has been studied using Hirshfeld analysis. It has been found that the difference in the reactivity of 1 towards Te is not due to the steric hindrance. [GRAPHICS] .