π-Complexes of the Group V metals with diphenylacetylene. Crystal structure of π-cyclopentadienyl-π-tetraphenylcyclobutadiene-π-diphenylacetyleneniobium carbonyl

Abstract
The molecular structure of a new π-acetylenic niobium complex has been determined, the co-ordinated triple bond length being 1·26 ± 0·04 Å.

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