Preparation of novel organometallic derivatives of cholesterol and their gel-formation properties

He, Panli; Liu, Jing; Liu, Kaiqiang; Ding, Liping; Yan, Jun; Gao, Di; Fang, Yu

doi:10.1016/j.colsurfa.2010.04.009

Cited by 32 publications

(12 citation statements)

References 47 publications

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“…As far as the spectrum of CH-C1 xerogel in nitrobenzene, some main peaks were observed at 3,436, 3,415, 1,728, and 1,593 cm -1 . These bands can be attributed to the N-H stretching, C=O stretching of ester, amide I band, and benzene ring, respectively [ 34 , 46 , 47 ]. These bands indicate H-bond formation between intermolecular amide and carbonyl groups in the gel state.…”

Section: Resultsmentioning

confidence: 99%

Spacer effect on nanostructures and self-assembly in organogels via some bolaform cholesteryl imide derivatives with different spacers

et al. 2013

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In this paper, new bolaform cholesteryl imide derivatives with different spacers were designed and synthesized. Their gelation behaviors in 23 solvents were investigated, and some of them were found to be low molecular mass organic gelators. The experimental results indicated that these as-formed organogels can be regulated by changing the flexible/rigid segments in spacers and organic solvents. Suitable combination of flexible/rigid segments in molecular spacers in the present cholesteryl gelators is favorable for the gelation of organic solvents. Scanning electron microscopy and atomic force microscopy observations revealed that the gelator molecules self-assemble into different aggregates, from wrinkle and belt to fiber with the change of spacers and solvents. Spectral studies indicated that there existed different H-bond formations between imide groups and assembly modes, depending on the substituent spacers in molecular skeletons. The present work may give some insight into the design and character of new organogelators and soft materials with special molecular structures.

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Section: Resultsmentioning

confidence: 99%

Spacer effect on nanostructures and self-assembly in organogels via some bolaform cholesteryl imide derivatives with different spacers

et al. 2013

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“…35 Using a cholesterol based gelator, ferrocene has been introduced as a pendant unit into dicholesteryl derivatives and the gelation behavior of these compounds has been explored. 23 Interestingly, the gel of one of these gelators with n-decane shows thermo-, mechanical-, acoustic-, and even chemical-stimulus responsive sol-gel phase transition properties but not the expected redox responsiveness to the gel systems. The latter finding is particularly surprising and may be attributed to the choice of the special oxidant used in this investigation.…”

Section: Switchable Polaritymentioning

confidence: 99%

Polymers with pendant ferrocenes

2016

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The tailoring of smart material properties is one of the challenges in materials science. The unique features of polymers with pendant ferrocene units, either as ferrocenyl or ferrocenediyl groups, provide electrochemical, electronic, optoelectronic, catalytic, and biological properties with potential for applications as smart materials. The possibility to tune or to switch the properties of such materials relies mostly on the redox activity of the ferrocene/ferricenium couple. By switching the redox state of ferrocenyl units - separately or in a cooperative fashion - charge, polarity, color (UV-vis range) and hydrophilicity of polymers, polymer functionalized surfaces and polymer derived networks (sol-gel) may be controlled. In turn, also the vicinity of such polymers influences the redox behavior of the pendant ferrocenyl units allowing for sensing applications by using polymer bound enzymes as triggering units. In this review the focus is set mainly on the literature of the past five years.

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“…In recent years, self-assembly and gelation properties of low-molecular-mass organic gelators have become one of the hot areas in soft matter research due to their scientific values and many potential applications in biomedical field, including tissue engineering, controlled drug release, and medical implants [1][2][3][4][5][6][7][8][9][10]. These organogels are usually considered as supramolecular gels, in which the gelator molecules self-assemble into three-dimensional networks in which the solvent is trapped via various noncovalent interactions, such as hydrogen bonding, -stacking, van der Waals interaction, dipole-dipole interaction, coordination, solvophobic interaction, and host-guest interaction [11][12][13][14][15]. In order to form appropriate organogels, there are two important points.…”

Section: Introductionmentioning

confidence: 99%

Nanostructures and Self‐Assembly of Organogels via Benzimidazole/Benzothiazole Imide Derivatives with Different Alkyl Substituent Chains

Shen

Jiao

Zhang

et al. 2013

Journal of Nanomaterials

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New benzimidazole/benzothiazole imide derivatives with different alkyl substituent chains were designed and synthesized. Their gelation behaviors in 22 solvents were tested as novel low-molecular-mass organic gelators. The test showed that the alkyl substituent chains and headgroups of benzimidazole/benzothiazole residues in gelators played a crucial role in the gelation behavior of all compounds in various organic solvents. More alkyl chains in molecular skeletons in present gelators are favorable for the gelation of organic solvents. SEM and AFM observations revealed that the gelator molecules self-assemble into different aggregates from wrinkle, lamella and belt to dot with change of solvents. Spectral studies indicated that there existed different H-bond formation between imide groups and hydrophobic force of alkyl substituent chains in molecular skeletons. The present work may give some insights into design and character of new organogelators and soft materials with special molecular structures.

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Preparation of novel organometallic derivatives of cholesterol and their gel-formation properties

Cited by 32 publications

References 47 publications

Spacer effect on nanostructures and self-assembly in organogels via some bolaform cholesteryl imide derivatives with different spacers

Spacer effect on nanostructures and self-assembly in organogels via some bolaform cholesteryl imide derivatives with different spacers

Polymers with pendant ferrocenes

Nanostructures and Self‐Assembly of Organogels via Benzimidazole/Benzothiazole Imide Derivatives with Different Alkyl Substituent Chains

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