The complex [Ni{2-PyNHC(S) NP(S)(OiPr)(2)-1,5,7-N, N',S}(2)] ([NiL2I]) dissolved in tri-n-octylphosphine (TOP) is decomposed in hot hexadecylamine (HDA) to give TOP-capped Ni nanoparticles. The same procedure using [Ni{2-MeC6H4NHC(S) NP(S)(OiPr)(2)}(2)-1,3-N, S] ([NiL2II]) and [Ni{PhC(S)NP(S)(OiPr)(2)-1,5-S, S'}(2)] ([NiL2III]) leads to the formation of NiS nanoparticles with the rhombohedral and hexagonal structures, respectively. NiHx nanoparticles were also produced from a mixture of [NiL2I] and N2H4. The obtained Ni nanoparticles can be used for the catalytic addition of Ph2S2 to 1-, 2- and 3-hexynes.