Abstract
Crystals of dichloro(η 5 -cyclopentadienyl)(N,N'-di-tert-butyl-1,2-ethanediimine-N,N')niobium were obtained by ligand exchange reaction between CpNbCl 2 (PMe 3 ) 3 and t BuN=CH-CH=N t Bu. The structure shows pseudo-octahedral coordination around the metal, with the chlorine ligands in cis positions relative to each other. The diimine ligand has an η 2 -coordination mode with the five-membered metallacyclic ring adopting an envelope conformation. The long C-N distance together with the short C-C one imply electronic delocalization over the chelate
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