Abstract
A new family of complexes containing bulky pyrazoles substituted in the 3 or the 3 and 5 positions, [RhCl(L 2)(Hpz R′,R″)] (L 2 NBD, 2CO; R′ Bu t, Ph, p-CH 3OC 6H 4 (An), R″ H; R′ Bu t, Ph, R″ CH 3; R′ R″ H, CH 3), has been obtained. A dynamic behaviour has been observed only in complexes with the less demanding pyrazole ligands, relating with a metallotropic equilibrium when R′ R″ H, Me, or a diolefin reorientation when R′ Bu t, Ph, An, R″ H. The X-ray crystal structure of [RhCl(CO) 2(Hpz An)] has been solved, showing a molecular stacking with a RhRh separation of 3.398(3) Å along the one-dimensional chain.
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