Dithiocarbamate complexes of Ti(IV) alkoxides: synthesis, characterization, and electrochemistry.
Isopropoxy- and tert-butoxy-tris(dithiocarbamato)titanium(IV) complexes of five dithiocarbamate ligands were prepared and characterized by LDI-MS, (1)H NMR, (13)C NMR, and elemental analysis, as well as by crystallographic determination of two examples. Both showed strongly pi-coordinated alkoxy groups and two separate dithiocarbamate coordination environments that, in solution, were in rapid exchange. Cyclic voltammetry in CH(2)Cl(2) revealed irreversible but reproducible oxidation peaks between +1.2 and +1.6 V vs Ag/AgCl, about 1 V positive of those from the free ligands, as well as reduction peaks in the -1.9 to -2.2 V range vs Ag/AgCl assigned to Ti(IV/III) couples, and second reductions in some cases. The corresponding diisopropoxy-bis(dithiocarbamato) analogues were not isolable and slowly transformed to the more stable tris species. Indeed, these were shown to be in slow equilibrium.
Donzelli
Alberto
A
Department of Chemistry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3.
Potvin
Pierre G
PG