| Abstract
| - nido-[1,1,2,2-(CO)4-1,2-(PPh3)2-1,2-FeIrB2H5](1) is formed as a degradation product from the reactionbetweentrans-Ir(CO)Cl(PPh3)2and[{Fe(CO)4}B6H9]-.1 is an analogue of a series of tetrahedral metalclusters and of a recently discovered series of tetrahedralbimetallaboranes. It is a member of a growing number ofmetalla-B2H5 species and perhaps is mostappropriately compared to the parent borane anion,nido-[B4H7]-.It was characterized by elemental analysis, high-resolution MS,NMR spectra, and a crystal structuredetermination.
- The synthesis and characterization ofnido-[1,1,2,2-(CO)4-1,2-(PPh3)2-1,2-FeIrB2H5](1) is reported. 1 is formedin low yield as a degradation product from the reaction between[{μ-Fe(CO)4}B6H9]-andtrans-Ir(CO)Cl(PPh3)2in THF and is characterized from NMR, IR, and analytical data and by asingle-crystal X-ray diffraction study.1 crystallizes in the monoclinic space groupP21/n with a =12.8622(12), b = 14.3313(12), c =23.579(3) Å, β= 97.12(2)°, Z = 4, V =4257.0(8) Å3, R1 = 4.83%,andwR2(F2)= 12.43%. The heterobimetallaborane structuremay be viewed as a derivative of the binary boron hydridenido-[B4H7]- and isrelated to the knownhomobimetallatetraborane analogues[Fe2(CO)6B2H6]and[Co2(CO)6B2H4].1 exhibits proton fluxionality in its1H NMR spectrum, which is related to that found in thelatter two compounds.
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