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Determination of gelation properties
A solid sample (5 mg) was placed in a test tube and the solvent
was added whilst heating on a hot plate. Insoluble solid was
denoted as ‘‘I’’ (insoluble). If the solid dissolved, the solution
was allowed to stand at room temperature. The precipitate
that formed was denoted as ‘‘P’’ (precipitate). Gelation was
confirmed by flow in the tube inversion test method. If a drop
was observed, it was denoted as ‘‘S’’ (soluble). If not, it was
denoted as ‘‘G’’ (gel). Upon formation of a gel, the procedure
was repeated with addition of the solvent until no gelation was
observed. Thus, the lowest concentration of the sample that
was required to afford a gel was determined, and this was
defined as the minimum gelation concentration (MGC, g LÀ1).
The thermal stability of the gels was evaluated by the gel-to-sol
transition temperature (Tg), which was defined as the tempera-
ture at which the gel started to collapse due to heating.
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Conflicts of interest
There are no conflicts to declare.
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Acknowledgements
We thank to Dr Yasuhiro Ishida (RIKEN) for giving the samples
for the synthesis of (S)-1.
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