Metal Template Synthesis of a Tripodal Tris(bipyridyl) Receptor that Encapsulates a Proton and an Iron(ii) Centre in a Pseudo Cage*
Christopher R. K. Glasson A , George V. Meehan A E , Cherie A. Motti B , Jack K. Clegg C D , Murray S. Davies A and Leonard F. Lindoy C E
+ Author Affiliations
- Author Affiliations
A School of Pharmacy and Molecular Sciences, James Cook University, Townsville, Qld 4814, Australia.
B The Australian Institute of Marine Science, Townsville, Qld 4810, Australia.
C School of Chemistry, F11, The University of Sydney, NSW 2006, Australia.
D Department of Chemistry, The University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK.
E Corresponding authors. Email: George.Meehan@jcu.edu.au; lindoy@chem.usyd.edu.au
Australian Journal of Chemistry 65(10) 1371-1376 https://doi.org/10.1071/CH11501
Submitted: 22 December 2011 Accepted: 29 January 2012 Published: 7 March 2012
Abstract
The Fe(ii) template synthesis of the first member of a new category of tripodal tris-bipyridine ligands incorporating a nitrogen bridgehead is reported. The X-ray structure of the reaction product shows that the ligand adopts a pseudo cage-like structure that encapsulates both a proton and an Fe(ii) ion in its cavity. The complex shows an extended helical arrangement that is effectively ‘capped’ at its open end by a hydrogen bonded PF6– counter ion that is symmetrically aligned with the 3-fold axis of the helix. A 1H NMR study demonstrated that the encapsulated proton can be reversibly exchanged under acid/base conditions in CD3CN.
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