Issue 45, 2011
From the journal:

Dalton Transactions

Nickel(ii) and iron(ii) triple helicates assembled from expanded quaterpyridines incorporating flexible linkages†

Christopher R. K. Glasson,a   George V. Meehan,*a   Cherie A. Motti,b   Jack K. Clegg,cd   Peter Turner,c   Paul Jensenc  and  Leonard F. Lindoy*c  

* Corresponding authors

a School of Pharmacy and Molecular Sciences, James Cook University, Townsville, Qld., Australia
E-mail: George.Meehan@jcu.edu.au

b The Australian Institute of Marine Science, Townsville, Qld., Australia

c School of Chemistry, F11, The University of Sydney, NSW, Australia
E-mail: lindoy@chem.usyd.edu.au
Fax: +61 2 93513329

d Department of Chemistry, The University of Cambridge, Lensfield Rd, Cambridge, UK

Abstract

In the present study the interaction of Fe(II) and Ni(II) with the related expanded quaterpyridines, 1,2-, 1,3- and 1,4-bis-(5′-methyl-[2,2′]bipyridinyl-5-ylmethoxy)benzene ligands (4–6 respectively), incorporating flexible, bis-aryl/methylene ether linkages in the bridges between the dipyridyl domains, was shown to predominantly result in the assembly of [M2L3]4+ complexes; although with 4 and 6 there was also evidence for the (minor) formation of the corresponding [M4L6]8+ species. Overall, this result contrasts with the behaviour of the essentially rigid ‘parent’ quaterpyridine 1 for which only tetrahedral [M4L6]8+ cage species were observed when reacted with various Fe(II) salts. It also contrasts with that observed for 2 and 3 incorporating essentially rigid substituted phenylene and biphenylene bridges between the dipyridyl domains where reaction with Fe(II) and Ni(II) yielded both [M2L3]4+ and [M4L6]8+ complex types, but in this case it was the latter species that was assigned as the thermodynamically favoured product type. The X-ray structures of the triple helicate complexes [H2O⊂Ni2(4)3](PF6)4·THF·2.2H2O, [Ni2(6)3](PF6)4·1.95MeCN·1.2THF·1.8H2O, and the very unusual triple helicate PF6− inclusion complex, [(PF6)⊂Ni2(5)3](PF6)3·1.75MeCN·5.25THF·0.25H2O are reported.

Graphical abstract: Nickel(ii) and iron(ii) triple helicates assembled from expanded quaterpyridines incorporating flexible linkages

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Article information

DOI
https://doi.org/10.1039/C1DT10820D
Article type
Paper
Submitted
03 May 2011
Accepted
30 Jun 2011
First published
24 Aug 2011

Dalton Trans., 2011,40, 12153-12159

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Nickel(II) and iron(II) triple helicates assembled from expanded quaterpyridines incorporating flexible linkages

C. R. K. Glasson, G. V. Meehan, C. A. Motti, J. K. Clegg, P. Turner, P. Jensen and L. F. Lindoy, Dalton Trans., 2011, 40, 12153 DOI: 10.1039/C1DT10820D

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