Unusual coordination mode for 1,3-diphosphete ligands towards a Cr–Cr quintuple bond complex

Abstract

The reaction of LCr5CrL (L = N2C25H29, 1) with the phosphaalkynes R-CΞP (R = tBu, Me, Ad) yields the neutral dimerisation compounds [L2Cr2(µ,η1:η1:η2:η2-P2C2R2)] (R = tBu (2), Me (3)) and...

Unusual cleavage of phosphaalkynes triple bond in the coordination sphere of transition metals

“…1). 10 However, although side-on coordination of phosphaalkynes is expected once a metal–metal bond is present in a molecule, more complex coordination modes 11 or even the fragmentation 12 of these species have also been reported. For example, Butenschön et al observed the fragmentation of t BuCP in the reaction with a (ω-di- tert -butylphosphanyl)(ethylcyclopentadienyl)cobalt chloride complex when using a threefold excess at r.t. under reductive conditions, resulting in a product with a carbyne and a phosphide ligand E .…”