Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00003 : Ion tunable of rheology of supramolecular metallogels
Author:
A bis(pyridylurea) ligand forms metallogels in methanol in the
presence of
up to 0.5 equiv of copper(II) chloride. The addition of further
copper(II)
chloride gives an unusual crystalline 4:3 coordination polymer,
whereas in
the presence of 0.5 equiv of copper(II) nitrate, a 2:1 crystalline
coordination polymer arises. The latter represents a possible
model for
supramolecular gelators and highlights key interactions with
counteranions
that suggest a means to tune gel properties using anion binding. The
influence of chloride and acetate anions on the rheological
properties of
the copper(II) chloride metallogels are investigated [1]. The
rheology of the
anion-containing mixtures shows complex behavior with the gel
structure
evolving over time. We also observe shear-induced gelation [2],
where
vigorous shaking, rather than sonication, transforms a weak jelly
like
aggregate into a robust gel, exhibiting clear structural changes
within the
gel fibres. Reversible anion tuning allows these compounds to as
responsive
soft materials.\\[4pt]
[1] Piepenbrock, M.M.; Clarke, N.; Steed, J.W.; Langmuir, 25,
8451, 2009.\\[0pt]
[2] Piepenbrock, M.M.; Clarke, N.; Steed, J.W.; Soft Matter, 6,
3541, 2010.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.3
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