Supramolecular gels based on organic diacid monoamides of cholesteryl glycinate

This article is intended to provide an overview of recent progress in the studies of cholesterol-based low-molecular mass gelators (LMMGs) with unusual properties, in particular, gelation and selective gelation at room temperature, gel emulsions and gel film formation, etc. Potential applications of the LMMGs in spilled oil collection and water purification are briefly presented.gelation at room temperature, selective gelation, gel emulsions, gel films

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“…Furthermore, the process can be reversed by simply eliminating CO 2 . Similar observations were also reported by other groups [37,38].…”

Section: Gelation At Room Temperaturesupporting

confidence: 92%

Progress in the studies of low-molecular mass gelators with unusual properties

Liu

Fang

2011

Sci. China Chem.

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“…It has been demonstrated in former research that organic diacid monoamides of cholesteryl glycinate are poor gelators for organic solvents [25]. However, neutralization of the acids with ammonia enhanced their gelling ability significantly [25].…”

Section: Design and Synthesis Of The Gelatorsmentioning

confidence: 99%

“…However, neutralization of the acids with ammonia enhanced their gelling ability significantly [25]. Referring to the structures of these compounds, another simple way to enhance their gelling ability is to modify their structures by connecting two molecules in order to change their structure from LS type to LS 2 type.…”

Section: Design and Synthesis Of The Gelatorsmentioning

confidence: 99%

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Synthesis and gelation behaviors of five new dimeric cholesteryl derivatives

et al. 2011

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Five new diacid amides of di-cholesteryl L-glycinates were designed and prepared. The compounds with linkers containing 0, 1, 2, 3, or 4 methylene units are denoted as 1, 2, 3, 4, and 5, respectively. Their gelation behaviors in 25 solvents were tested as novel low-molecular-mass organic gelators (LMOGs). It was shown that the length of the linker connecting the two-cholesteryl residues in a gelator plays a crucial role in the gelation behavior of the compound. 1 gels 11 of the 25 solvents tested at a concentration lower than 1.0%, while 2 gels 17 of the solvents tested. 4 and 5, however, gel only 2 and 4 of them, respectively. SEM observation reveals that the lengths of the linkers and the identity of the solvents are the main factors affecting the structures of the aggregates in the gels. Experimentally, a clear linker effect on the microstructures of the gels was observed. As example, the aggregates of 1, 2 and 3 in benzene or 1-heptanol adopt structures of thin fibers, rods or lamellas, respectively. Furthermore, it was found that the gelation and aggregation behaviors of 2, 3, 4, and 5 in DMSO showed an even-odd effect. organogelators, cholesterol, linker effect, solvent effect

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“…[1][2][3][4] In suitable solvents, LMOGs could autonomously assemble into the three-dimensional networks through the non-covalent interaction, such as hydrogen bond, electrostatic force, hydrophobic force, π-π stacking etc. Up to now, a mass of organogels that can respond to the external stimuli, 5 and small molecules, 16 have been reported. However, designing controllable gelation system based on reversible changes of a gelator molecule induced by external stimuli is still a significant challenge to scientists.…”

Section: Introductionmentioning

confidence: 99%

Study on the Controlled Gel Formation and Photochromic Properties of a New Cholesterol-bridge-naphthopyran Dyad

Sun¹,

Wang²,

Liu³

et al. 2014

Bulletin of the Korean Chemical Society

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A cholesterol-bridge-naphthopyran dyad (NP-MCB) was designed and synthesized. NP-MCB can readily selfassemble into gels under ultrasound-radiation in several organic solvents and the formed gels easily transfer to solution by heat. This reversible process can be repeated many times. Scanning Electron Microscopy results showed that the morphologies of all formed xerogels in different solvents have fibrillar microstructure. The gels formation was due to energy and pressure afforded by the ultrasonic process, resulting in formation of molecular hydrogen bonding and molecular aggregation. NP-MCB displayed the normal photochromism both in solution and gel states. The kinetic results confirm that the colored merocyanine in gels show a slower fading speed than that in solution due to the compact aggregation of NP-MCB molecules in gels. The xerogel film formed in polar gelling solvent had large surface wettability than that in nonpolar gelling solvent.

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Supramolecular gels based on organic diacid monoamides of cholesteryl glycinate

Cited by 23 publications

References 57 publications

Progress in the studies of low-molecular mass gelators with unusual properties

Progress in the studies of low-molecular mass gelators with unusual properties

Synthesis and gelation behaviors of five new dimeric cholesteryl derivatives

Study on the Controlled Gel Formation and Photochromic Properties of a New Cholesterol-bridge-naphthopyran Dyad

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