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Abstract
The new complexes [NiX(C6Cl5)(PCy3)2] where X is Cl, I, NCS, NCO or N3 or N3 and PCy3 is tricyclohexylphosphine have been prepared.
The solutions of these compounds are stable under nitrogen but they are air-sensitive. They are decomposed by gaseous hydrogen chloride leading to the formation of C6Cl5H, whereas, all the reported pentachlorophenylnickel(II) phosphine containing complexes do not decompose in these conditions. These results show that the simultaneous presence of the very bulky ligands C6Cl5 and PCy3 cause a remarkable increase in the reactivity of these complexes. The exchange reactions of PCy3 by PPh3 in [NiX(C6Cl5)(PCy3)2] in chloroform lead to formation of [NiC(C6Cl5)(PPh3)2] and [Ni(NCS)(C6Cl5)(PPh3)(PCy3)]. Similar results are obtained with PEt3.