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A dicopper complex featuring a symmetrically bridging nitrile ligand and supported by a binucleating naphthyridine-based ligand, [Cu 2 ( μ-η   1  : η   1  -MeCN)DPFN](NTf 2 ) 2 , was treated with phosphaalkynes (RC[triple bond, length as m-dash]P, isoelectronic analogues of nitriles) to yield dicopper complexes that exhibit phosphaalkynes in rare μ-η  2 : η  2 binding coordination modes. X-ray crystallography revealed that these unusual "tilted" structures exist in two isomeric forms (R "up" vs. R "sideways"), depending on the steric profile of the phosphaalkyne's alkyl group (R = Me, Ad, or  t  Bu). Only one isomer is observed in both solution and the solid state for R = Me (sideways) and  t  Bu (up). With intermediate steric bulk (R = Ad), the energy difference between the two geometries is small enough that both are observed in solution, and NMR spectroscopy and computations indicate that the solid-state structure corresponds to the minor isomer observed in solution. Meanwhile, treatment of [Cu 2 ( μ-η  1 : η  1 -MeCN)DPFN](NTf 2 ) 2 with 2-butyne affords [Cu 2 ( μ-η  2 : η  2 -(MeC[triple bond, length as m-dash]CMe))DPFN](NTf 2 ) 2 : its similar ligand geometry demonstrates that the tilted μ-η  2 : η  2 binding mode is not limited to phosphaalkynes but reflects a more general trend, which can be rationalized via an NBO analysis showing maximization of π-backbonding.

Isomerism and dynamic behavior of bridging phosphaalkynes bound to a dicopper complex