Transition metal complexes with hydrazides and hydrazones. Part 6. Complexes of dioxomolybdenum(Ⅵ) with benzoylacetone 1-naph-thoylhydrazone

摘要

The reaction between MoO_2(acac)_2 and tridentate ONO benzoylacetone 1-naphthoyl-hydrazone (H_2L) in alcoholic solutions, in the presence of an appropriate monodentate donor (S), gives rise to complexes of the general formula [MoO_2(L)S] (S = H_2O, py, MeOH, EtOH, DMSO, DMF and PPh_3). The desolvated complex MoO2(L) was obtained from the chloroformic solution. The same type of complex was also obtained by the isothermal heating of [MoO_2(L)S]. An octahedral structure was assigned to the [MoO_2(L)S] complexes in which the sixth coordination site is occupied by a molecule of the monodentate donor S. The MoO_2(L) complex obtained from the CHCl_2 solution has most probably a five-coordinated structure whereas the MoO_2(L) complex obtained by isothermal desolvation of the [MoO_2(L)S] complex is assumed to possess a polymeric octahedral structure. All complexes prepared contain a cis-MoO_2 group. The complexes were characterized by elemental analysis, electronic and IR spectra, thermal analysis, molar conductance and magnetic susceptibility measurements.