On the basis of an X-ray structural study it is shown that the product of the reaction of Rh(PPh3)2(PPh2C6H4) (Ph=phenyl) with two molecules of diphenylacetylene represents a novel molecular system. The product has the composition Rh(PPh3)(PPh2-C6H4C4Ph4) and may be named 5,5,7,8,9,10-hexaphenyl-6-(triphenylphosphine)-5,6-dihydro-5-phospha-6-rhodabenzocyclooctene. The coordination about the Rh atom is distorted square-planar. The P of the PPh3 group is at one coordination site. The P of the PPh2C6H4X is at a second coordination site. The X group ortho to P on the C6H4 ring has formal composition C4Ph4 and is coordinated to the Rh in a bidentate manner via both a π and a σ bond, thus completing the coordination. The material crystallizes as a 1/1 toluene complex with four formula units in space group C2h5 -P21/n of the monoclinic system in a cell of dimensions a=20.262(7), b = 14.535(5), c = 18.476(8)Å, β = 91.54(2)°. The final conventional R factor is 0.049 for the 2019 X-ray data collected by counter methods.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry