Lugo Christopher A, Moore Curtis E, Rheingold Arnold L, Lavallo Vincent
Department of Chemistry, University of California-Riverside (UCR) , Riverside, California 92521, United States.
Inorg Chem. 2015 Mar 2;54(5):2094-6. doi: 10.1021/ic5030636. Epub 2015 Feb 10.
A hybrid terphenyl/o-carborane ligand building block is synthesized by the reaction of m-terphenylalkyne with B10H14. This sterically demanding substituent can be installed into ligands, as demonstrated by the preparation of carboranylphosphine. The bulky phosphine reacts with [ClRh(CO)2]2 to produce monophosphine complex ClRhL(CO)2, which subsequently extrudes CO under vacuum to afford the dimeric species [ClRhL(CO)]2. The latter complex does not react with excess phosphine and is resistant toward cyclometalation, which is in contrast to related o-carborane phosphine complexes. Data from a single-crystal X-ray diffraction study are utilized to quantify the steric impact of the ligand via the percent buried volume approach.
