Synthetic and structural studies of the mononuclear nickel(II) ethanedithiolate complexes with chelating N-substituted bis(diphenylphosphanyl)amine

Abstract

Four nickel(II) ethanedithiolate complexes with chelating N-substituted bis(diphenylphosphanyl)amine RN(PPh2)2 were prepared and structurally characterized. Reactions of the mononuclear nickel(II) dichloride complexes [RN(PPh2)2]NiCl2 [R=CH(CH3)2, 1; CH2CH(CH3)2, 2; CH2CH2CH2CH3, 3; CH2Ph, 4] with 2,3-butanedithiol [HSCH(CH3)CH(CH3)SH] in the presence of triethylamine in CH2Cl2 afforded the mononuclear nickel(II) ethanedithiolate complexes [RN(PPh2)2]Ni[SCH(CH3)CH(CH3)S] [R=CH(CH3)2, 5; CH2CH(CH3)2, 6; CH2CH2CH2CH3, 7; CH2Ph, 8] in 44–71% yields. All the new complexes 5–8 have been characterized by 1H NMR, 31P{1H} NMR, 13C{1H} NMR and HR-MS spectroscopy, as well as by X-ray diffraction analysis.