)Ni(PhCCPh) (4): [( Ph bppe H,CHptol2 )Ni]2(μ-N2) (1 dimer , 50 mg, 0.030 mmol) was weighted in a vial and dissolved with 5 mL of toluene. Diphenylacetylene (11 mg, 0.062 mmol) dissolved in 1 mL of toluene was added at once and the solution was stirred for 5h. Afterwards, the solution was concentrated to approximately 1 mL under vacuum. Hexane (1 mL) was added to the solution, which was cooled down to -35 ºC for 15 min. The precipitate was separated by decantation, washed with cold hexane twice and dried to obtain the product as a yellow powder (53 mg, 90 % yield). The high sensitivity of the compound did not allow to obtain elemental analysis data.