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

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(11) 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 H-1 NMR,P-31{H-1} NMR, C-13{H-1} NMR and HR-MS spectroscopy, as well as by X-ray diffraction analysis. (C) 2014 Elsevier Ltd. All rights reserved.