Enantiospecific assembly of a homochiral, hexanuclear palladium complex
Colquhoun, H.M., Powell, T., Zhu, Z.X., Cardin, C.J., Gan, Y., Tootell, P., Tsang, J.S.W. and Boag, N.M. (2009) Enantiospecific assembly of a homochiral, hexanuclear palladium complex. European Journal of Inorganic Chemistry, 2009 (8). pp. 999-1002. ISSN 1434-1948
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To link to this article DOI: 10.1002/ejic.200801045
The linking of orthopalladated ferrocenylene units by parabanato(2-) ligands results in enantiospecific assembly of a hexanuclear complex in which (i) the steric bulk of the ferrocenylene moiety, (ii) the folded configuration dictated by the imidato(2-) bridging ligand, and (iii) the strong preference for a trans arrangement of the carbonyl oxygen and ferrocenyl carbon atoms, combine to ensure that only ferrocenylene-palladium units with the same chirality can be located at adjacent positions in the assembled complex. The resulting tris-parabanato(2-)-bridged, hexapalladium complex is thus homochiral (R,R,R,R,R,R or S,S,S,S,S,S), as demonstrated by H-1 NMR spectroscopy and by X-ray analysis of a racemic crystal which shows the complex to possess a tapering, twisted, trigonal-prismatic skeleton of palladium atoms with threefold crystallographic symmetry. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)