A π(CC)-δ(MM)-π(CC) electron framework exists in the title compound 1, the simplest complex of the type [M2(CCR)4(PMe3)4], and the first to be characterized by X-ray crystallography. This dimetallapolyyne differs from the more highly substituted derivatives in its electronic properties; however, in several instances, the properties of 1 closely parallel its nearest organic analogue, the tetraethynylethene C10H14. L = PMe3.
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Stoner et al. (1993) studied this question.