and co-workers reported gelator 30 (Scheme 2.5), the cooperation and relative
competition of intra- and intermolecular hydrogen bonds are directed by the sonication or thermal process. Upon sonication irradiation, the conformational transition from intramolecular hydrogen bonding between the –C=O bond of naphthalic
anhydride and –NH (ethyl imide) to intermolecular hydrogen bonding accompanied
by the morphology changes from vesicle to fibres (Fig. 2.22) [93]. Similarly, the
(R)-N-Fmoc-octylglycine cyclohexane gels are induced under sonication with
interconnection of nanofibres for the formation of the fibrous network [106].
Complex 31 (Scheme 2.5) as a typical sonication-induced gelator has been studied
by Liu and co-workers The transformation of the conformation converts from a
perpendicular mode to a coplanar mode of 1,8-naphthalimide and the platinum(II)terpyridyl ring accompanied by the precipitate-to-gel transition. The initial vesicles
are formed by the hydrophobic interactions between cholesterol groups, aggregate
Fig. 2.20 Schematic representation of the aggregation changes of 28 in acetonitrile and toluene.
Reprinted with the permission from Ref. [104]. Copyright 2010 John Wiley & Sons, Inc.
Fig. 2.21 Schematic representation of structure transformations induced by sonication. Reprinted
with the permission from Ref. [105]. Copyright 2005 American Chemical Society
32
2 Supramolecular Gels
competition of intra- and intermolecular hydrogen bonds are directed by the sonication or thermal process. Upon sonication irradiation, the conformational transition from intramolecular hydrogen bonding between the –C=O bond of naphthalic
anhydride and –NH (ethyl imide) to intermolecular hydrogen bonding accompanied
by the morphology changes from vesicle to fibres (Fig. 2.22) [93]. Similarly, the
(R)-N-Fmoc-octylglycine cyclohexane gels are induced under sonication with
interconnection of nanofibres for the formation of the fibrous network [106].
Complex 31 (Scheme 2.5) as a typical sonication-induced gelator has been studied
by Liu and co-workers The transformation of the conformation converts from a
perpendicular mode to a coplanar mode of 1,8-naphthalimide and the platinum(II)terpyridyl ring accompanied by the precipitate-to-gel transition. The initial vesicles
are formed by the hydrophobic interactions between cholesterol groups, aggregate
Fig. 2.20 Schematic representation of the aggregation changes of 28 in acetonitrile and toluene.
Reprinted with the permission from Ref. [104]. Copyright 2010 John Wiley & Sons, Inc.
Fig. 2.21 Schematic representation of structure transformations induced by sonication. Reprinted
with the permission from Ref. [105]. Copyright 2005 American Chemical Society
32
2 Supramolecular Gels