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Issue 38, 2010
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δ-Bonding in the [Pd44-C9H9)(μ4-C8H8)]+ sandwich complex

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A remarkable triple-decker sandwich complex [Pd44-C9H9)(μ4-C8H8)][BArf4] (BArf4 = B{3,5-(CF3)2(C6H3)}4) composed of cyclononatetraenyl anion and cyclooctatetraene as “bread pieces” and square tetrapalladium dication as “meat” (Fig. 1a) has been synthesized recently [Murahashi et al., J. Am. Chem. Soc., 2009, 131, 9888]. This complex attracted our attention because of the presence of an almost perfect square sheet composed of four palladium atoms. Such a structure could be a sign of aromatic nature of chemical bonding as it was shown to be present in the square Al42 cluster [Li et al., Science, 2001, 291, 859]. In this work we show that according to our chemical bonding analysis the bonding in the Pd42+ unit of [Pd44-C9H9)(μ4-C8H8)]+ is of δ-character among four palladium atoms, making the triple-decker sandwich complex the first synthesized compound identified as having δ-bonding in its cyclic building block when it's in solution or in a crystalline state.

Graphical abstract: δ-Bonding in the [Pd4(μ4-C9H9)(μ4-C8H8)]+ sandwich complex

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Publication details

The article was received on 07 May 2010, accepted on 22 Jul 2010 and first published on 20 Aug 2010

Article type: Communication
DOI: 10.1039/C0CP00475H
Citation: Phys. Chem. Chem. Phys., 2010,12, 12050-12054
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    δ-Bonding in the [Pd44-C9H9)(μ4-C8H8)]+ sandwich complex

    A. P. Sergeeva and A. I. Boldyrev, Phys. Chem. Chem. Phys., 2010, 12, 12050
    DOI: 10.1039/C0CP00475H

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