Synthesis and Crystal Structures of the Gold-Carbaborane Complexes -9-(μ-H)-10-endo--7,8-Me2-nido-7,8-C2B9H8> and -10-endo--7,8-Me2-nido-7,8-C2B9H8>

DOI: 10.1039/DT9940000025

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Journal of the Chemical Society, Dalton Transactions p. 25 - 32 (1994)

Update date:2022-08-02

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Authors:

Jeffery, John C.

Jelliss, Paul A.

Stone, F.Gordon A.

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Article abstract of DOI:10.1039/DT9940000025

Treatment of the salt <10-endo--7,8-Me2-nido-7,8-C2B9H9> with in CH2Cl2 afforded the digold complex <9-exo--9-(μ-H)-10-endo--7,8-Me2-nido-7,8-C2B9H8>.Deprotonation of the latter with NaH in tetrahydrofuran followed by addition of gave the trigold compound <10-exo--10-endo--7,8-Me2-nido-7,8-C2B9H8>.The crystal structures of the new compounds have been determined by X-ray diffraction.In the digold species one Au(PPh3) group is endo-bound to the nido-C2B9 cage, primarily through a connectivity with the boron atom which is in the β-site with respect to the two carbons in the open face.There is a weaker attachment to one of the α-boron atoms, while the other α-BH unit forms a three-centre two-electron B-H <*> Au bond with the second Au(PPh3) group .The latter gold fragment lies exo with respect to the open face of the carbaborane cage, with an Au-Au separation of 2.875(1) Angstroem.The structure of the trigold complex is formally related to that of its digold precursor by replacement of the μ-H atom in the latter by an Au(PPh3) moiety.This results in the molecule having an essentially isosceles triangle of gold atoms , asymmetrically bridged by the β-boron of the open face of the C2B9 cage.The NMR data (1H, 13C-<1H>, 31P-<1H> and 11B-<1H>) of the compounds are reported and discussed.

Full text of DOI:10.1039/DT9940000025

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