The crystal and molecular structure of [1,1,1,1-(CO)H(PPh3)2-arachno-1-IrB3H7] and some bonding considerations in arachno-type four-vertex metal ‘π-allyl’ and ‘borallyl’ clusters
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 1843-1847
- https://doi.org/10.1039/dt9850001843
Abstract
The detailed molecular structure of [(CO)(PPh3)2HIrB3H7] has been determined by X-ray diffraction analysis. The colourless crystals are monoclinic, space group P21/n with a= 1 182.0(3), b= 2 189.4(4), c= 1 355.7(3) pm, β= 104.27(2)°, and Z= 4. The molecular structure (R= 0.032 for 4 119 reflections) features a four-vertex butterfly cluster (IrB3) with Ir on a ‘hinge’ position. The structure is interpreted in terms of a ‘capped octahedral’ seven-orbital 18-electron d4 iridium(V) complex in which the metal–borane bonding occurs predominantly via three two-electron two-centre iridium–boron bonds. The cluster bonding implications are discussed with reference to the ‘π-allyl’ and ‘borallyl’ bonding modes.Keywords
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