Planar Ni(II) 1,2-dithiolenes involving bidentate P-donor ligands

Abstract: A series of planar Ni(II) dithiolenes derived of maleonitriledithiol (mnt), benzene-1,2-dithiol (bdt) and toluene-3,4-dithiol (tdt) with bidentate P,P-ligands (dppe=1,2-bis(diphenylphosphino)ethane, dppp=1,3-bis(diphenylphosphino)propane, dppb=1,4-bis(diphenylphosphino)butane, dpppn=1,5-bis(diphenylphosphino)pentane) of the [Ni(P,P)(dithiol)] type have been synthesized. The compounds have been characterized by elemental analysis, IR and electronic spectroscopies, magnetochemical, conductivity measurements and thermal analysis. Single crystal X-ray analysis of [Ni(dpppn)(mnt)] confirmed a planar geometry of NiP2S2 chromophore. Possible practical applications such as use of these compounds for vulcanization accelerators and their anticholinesterase activity were evaluated. [Copyright &y& Elsevier]