Effect of Pnictogen Ligand Substitution on a Tripalladium Ditropylium Core

A combination of multinuclei NMR, UV−vis spectroscopy, and single crystal X-ray diffraction was used to characterize a new series of tripalladium ditropylium sandwich complexes [Pd3Tr2(E)3][BF4]2 (E = PPh3, AsPh3, and SbPh3 and PEt3). Ligand substitution leads to a systematic shift of the 1H and 13C...

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Bibliographic Details
Published in:Inorganic chemistry 2010-05, Vol.49 (9), p.4307-4312
Main Authors: Babbini, Dominic C, Mulligan, Frank L, Schulhauser, Hannah R, Sweigart, Tara C, Nichol, Gary S, Hurst, Stephanie K
Format: Article
Language:English
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Summary:A combination of multinuclei NMR, UV−vis spectroscopy, and single crystal X-ray diffraction was used to characterize a new series of tripalladium ditropylium sandwich complexes [Pd3Tr2(E)3][BF4]2 (E = PPh3, AsPh3, and SbPh3 and PEt3). Ligand substitution leads to a systematic shift of the 1H and 13C NMR tropylium resonances and is correlated with the electron donating properties of the substituent group. Replacement of the ligand increases the palladium-pnictogen bond length in the order P < As < Sb; however, this only slightly alters the internal Pd−Pd bond lengths, supporting the hypothesis that there are only weak Pd−Pd bonding interactions.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic100151x