Synthesis and characterization of the unusual cluster [Ni _2(GaAr′)_2(η1:η1- μ_2-C_2H_4)]: Ready addition of ethylene to Ni(COD)(GaAr′)_2 at 25 °c and 1 atmosphere

摘要

The nickel (0) compound Ni(COD)(GaAr′)_2 (Ar′ = C_6H_3-2,6-(C_6H_3-2,6-i-Pr _2)_2), 1, was synthesized by the reaction of Ni(COD) _2 (COD = 1,5-cyclooctadiene) with (GaAr′)_2. Compound 1 reacted with ethylene at 25 °C and at 1 atm pressure to give the bimetallic cluster [Ni2(GaAr′)_2(η~1: η~1-μ_2-C_2H_4)], 2, through the incorporation of one molecule of ethylene and displacement of COD. The structure of 2 featured an unusual Ni_2Ga_2C_2 core bicyclic structure in which the C_2H_4 moiety bridges the Ga···Ga edge of a Ga_2Ni_2 tetrahedron. The galliums each carry an η1-bonded Ar′ substituent which complexes the nickel atom by an η~6-π interaction with one of its flanking Ar' rings.