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It hinges on the ligand: The electron-donor ability of NiN2S2 ligands is compared to that of traditional diphosphine and diimine ligands. Structural comparison of NiN2S2 and o-phenanthroline (phen) complexes of {W(CO)4} and {PdX2} units shows asymmetry imposed by the hinge bonding of the NiN2S2 S donors (see superimposed structures) which favors stereo- and regioselective substrate addition.
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Rampersad et al. (2005) studied this question.
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