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Issue 1, 2006
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SPANphos: trans-spanning diphosphines as cis chelating ligands!

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Several SPANphos ligands based on a spirobichroman backbone, introduced as a putative trans ligand, form compounds of the type [Rh(nbd)(SPANphos)]BF4 (1–6) in which both norbornadiene and SPANphos act as cis chelating ligands. The cyclooctadiene rhodium chloride derivatives form bimetallic complexes. Crystal structures for several of these compounds and free ligands are reported. Semiemperical AM1 and DFT calculations show that spirobichroman can assume several conformations, some of which are suitable for the formation of cis chelating SPANphos. All calculations on SPANphos complexes of PdCl2, PtCl2 and Rh(CO)Cl show that the trans complex is more stable by 4–10 kcal mol−1. The cis conformation in 1–6 is enforced by the cis chelating norbornadiene ligand.

Graphical abstract: SPANphos: trans-spanning diphosphines as cis chelating ligands!

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Article information

29 Sep 2005
31 Oct 2005
First published
18 Nov 2005

Dalton Trans., 2006, 268-278
Article type

SPANphos: trans-spanning diphosphines as cis chelating ligands!

C. Jiménez-Rodríguez, F. X. Roca, C. Bo, J. Benet-Buchholz, E. C. Escudero-Adán, Z. Freixa and P. W. N. M. van Leeuwen, Dalton Trans., 2006, 268
DOI: 10.1039/B513870C

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