Journal
SOFT MATTER
Volume 7, Issue 1, Pages 75-84Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0sm00594k
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Funding
- Commonwealth Scholarship Commission
- Herchel Smith Fellowship Fund
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1-(3-Methyl-1H-pyrazol-5-yl)-3-(3-nitrophenyl) urea (1) forms hydrogels in a range of acids at pH 1-2. The morphology and rheology of these gels are dependent on the identity of the anion and represent a way of tuning the gels' physical properties. The magnitude of the elastic storage modulus of the gels follows the trend according to the acid used to protonate the gelator H2SO4 > MePO3H2 > H3PO4 approximate to HBF4 approximate to HPF6 > EtPO3H2. Chloride salts do not form gels and the nitrate gels are unstable with respect to crystallisation. Salting out or addition of methanol results in the characterisation of five salts of 1 which reveals extensive solvation in the solid state and the absence of urea...urea hydrogen bonding in contrast to the well known bis(urea) gelators.
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