Cluster chemistry. Part 32. Synthesis and X-ray crystal structure of [Ru5(µ5-η2-C2PPh2-P)(µ-PPh2)(CO)13], a complex containing an alkynyl ligand in extended interaction with an open Ru5cluster
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 6,p. 1229-1234
- https://doi.org/10.1039/dt9850001229
Abstract
The radical ion-initiated reaction between [Ru3(CO)12] and C2(PPh2)2(dppa)(in 2 : 1 ratio) gives [{Ru3(Co)11}2(µ-dppa)](2), in which the acetylenic bis-tertiary phosphine bridges two monosubstituted Ru3 clusters. On heating (90 °C, 1 h), complex (2) is converted into [Ru5(µ5-η2-C2PPh2-P)(µ-PPh2)(CO)13](3) in 88% yield, which was characterised by an X-ray study at 295 K. The complex contains a seven-electron donor C2PPh2 ligand interacting with all five Ru atoms of an open Ru5 cluster consisting of three edge-fused Ru3 triangles (a ‘swallow’ cluster); the PPh2 group bridges the non-fused edge of the central triangle. Some comparisons with [Ru5(µ5-CNBut)(CO)14(CNBut)] and [Ru5(µ5-C2Ph)(µ-PPh2)(CO)14] are made. Crystals of complex (3) are monoclinic, space group P21/n, with a= 17.00(1), b= 17.394(9), c= 14.260(7)Å, β= 92.89(4)°, and Z= 4; the structure was refined by least-squares methods to a residual of 0.031 for 6 364 independent ‘observed’ reflections.Keywords
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