Abstract
The diselenaundecaborate anion, [Se2B9H10]− (1), is isolated in 49 % yield from the one-pot reaction of nido-B10H14, Proton Sponge and selenium in thf. In solution, 1 exhibits a fluxional interchange between symmetry-equivalent positions of its two selenium atoms and open-face ‘bridging’ hydrogen atom that cannot be frozen out on the NMR timescale. This is however resolved by solid-state boron-11 NMR spectroscopy, which shows the spectrum expected from a DFT/GIAO calculation. The treatment of two equivalents of 1 with HgCl2 in dichloromethane affords the conjoined binary cluster anion [(Se2B9H10)(SeB9H11)]− (2), in which the ‘bridging’ selenium atom in 1 links to an {arachno-SeB9H11} moiety. This metal-mediated linking of selenaborane clusters potentially opens a gateway to new macropolyhedral heteroborane assemblies.
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