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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
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 http://dx.doi.org/10.1071/CH11501
Submitted: 22 December 2011 Accepted: 29 January 2012 Published:
7
March
2012
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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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