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Issue 13, 2011
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Access to multinuclear salen complexes using olefin metathesis

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The use of olefin metathesis as a construction tool for multimetallic salen-based structures is described. The approach involves mono- and diallyl-functionalized metallosalen complexes that can be directly coupled by metathesis leading to dimetallic species or mixtures of linear and cyclic oligomers. The metathesis of bis-allyl Ni(salen) complexes has been studied in detail. At high concentration it is possible to selectively obtain di-Ni species rather than heavier oligomers while under dilute conditions cyclic rather than linear oligomers are preferentially obtained. A mono-allyl Zn(salphen) complex was efficiently coupled using metathesis to give the di-Zn(salphen) product, which was subsequently transmetalated with a variety of metals to yield dimetallic salens of potential catalytic interest. Finally, a tetranuclear Zn4 macrocycle was also prepared using buildings blocks obtained by metathesis from commercially available precursors. The methods described herein allow for the facile construction of multi-centered Schiff base complexes of catalytic or supramolecular interest.

Graphical abstract: Access to multinuclear salen complexes using olefin metathesis

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Article information

18 Oct 2010
09 Dec 2010
First published
04 Feb 2011

Dalton Trans., 2011,40, 3352-3364
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Access to multinuclear salen complexes using olefin metathesis

R. M. Haak, A. M. Castilla, M. Martínez Belmonte, E. C. Escudero-Adán, J. Benet-Buchholz and A. W. Kleij, Dalton Trans., 2011, 40, 3352
DOI: 10.1039/C0DT01411G

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