Cholesterol-based dimeric liquid crystals: synthesis and mesomorphic behaviour

Yelamaggad, C. V.; Nagamani, S. Anitha; Hiremath, Uma S.; Nair, Geetha G.

doi:10.1080/02678290110039499

Cited by 60 publications

(28 citation statements)

References 4 publications

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“…1(c)] was also found. In addition, the spectrum of Chol-(CL) 40 -Chol shown a broad band at 3387 cm 21 , which belongs to NÀ ÀH stretching vibration, the presence of CÀ ÀN was supported by the absorption peak at 1530 cm 21 . These indicated that HDI was present in Chol-(CL) 40 -Chol.…”

Section: Synthesis and Characterization Of Functionalized Triblock Pomentioning

confidence: 95%

“…As a typical example, the FTIR spectra for Chol-(CL) 40 -Chol was shown in Figure 1, the band at 1724 cm 21 was attributed to C¼ ¼O in Chol-(CL) 40 -Chol repeating units as well as in Chol-(CL) 20 . And the weak absorption peak at 1630 cm 21 which comes from C¼ ¼C of cholesteryl moiety both in the spectra of Chol-(CL) 20 [ Fig. 1(b)] and that of Chol-(CL) 40 -Chol [ Fig.…”

Section: Synthesis and Characterization Of Functionalized Triblock Pomentioning

confidence: 99%

“…Fourier transform infrared (FTIR) spectra were recorded on a Nicolet-510P spectrometer at frequencies ranging from 400 to 4000 cm 21 . Samples were thoroughly mixed with KBr and pressed into pellet form.…”

Section: Instrument and Measurementmentioning

confidence: 99%

“…It is well known that the liquid crystalline character of a series of cholesteryl esters has been found for a long time, [20][21][22][23][24] especially in recent years low molecular weight dicholesteryl esters attracted much attention as a new class of self-assembly materials. [25][26][27][28][29] Here, it was anticipated that the cholesteryl moiety could provide a driving force for the self assembly of the dicholesteryl functionalized triblock polymers.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of functionalized triblock polymer: The prepared polymer is cholesteryl terminated and chain‐extended PCL

Guo

Sun

Cao

et al. 2007

J of Applied Polymer Sci

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The functionalized triblock polymer for the preparation of self-assembly biomaterials, Chol-(CL) n -Chol, was synthesized through ring-opening polymerization of ecaprolactone (e-CL) following by chain-extension reaction. The chemical structure of functionalized triblock polymer was confirmed by Fourier transform infrared and 1 H-NMR. The molecular weight of the functionalized polymer increased with decreasing feed ratio of the initiator cholesterol (Chol) to the monomer e-CL. Liquid crystalline properties and the self-assembly behavior of the functionalized polymer were validated by Wide angle X-ray diffraction, differential scanning calorimetry, and polarizing light microscope. The results showed that Chol-(CL) n -Chol ( n 40) exhibited liquid crystallinity in particular temperature ranges because of the incorporation of the cholesteryl moiety. In addition, the functionalized triblock polymer can be homogeneously blended with high molecular weight poly(e-caprolactone) (PCL), which offers the possibility to modify the properties of biomaterials based on PCL. Mixing a small amount of a Chol-(CL) n -Chol functionalized polymer with PCL, or coating a thin layer of the functionalized polymer on the surface of a PCL-based implant may modify cell response.

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Section: Synthesis and Characterization Of Functionalized Triblock Pomentioning

confidence: 95%

Section: Synthesis and Characterization Of Functionalized Triblock Pomentioning

confidence: 99%

Section: Instrument and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and characterization of functionalized triblock polymer: The prepared polymer is cholesteryl terminated and chain‐extended PCL

Guo

Sun

Cao

et al. 2007

J of Applied Polymer Sci

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“…8 On the other hand, most of their phase transition temperature is high and not wide enough. For example, in the case of the compounds 2 that contain cholesteryl and biphenyl aromatic mesogens linked by polymethylene spacer, 4,6,7 most of their phase transition temperature are much higher than 80 ℃ and the width of N* is narrower.…”

Section: Introductionmentioning

confidence: 98%

Low and Wide Phase Transition Temperature Dimesogenic Compounds Consisting of a Cholesteryl and 4-(trans-4-n-Alkylcyclohexyl)phenoxy Mesogens

et al. 2006

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Unsymmetrical dimesogenic compounds with cholesteryl and 4-(trans-4-n-alkylcyclohexyl)phenoxy parts were synthesized by condensation of cholester-3-yl 6-bromohexanoate with appropriate 4-(trans-4-n-alkylcyclohexyl)-phenols. Structures and thermal phase behaviour of these dimesogenic compounds have been confirmed by IR, 1 H NMR, elemental analysis, DSC, polarity microscopy and XRD measurements. Their thermal phase behaviour was significantly different with that of other cholesterol-based dimesogens while they exhibited low and wide phase transition temperature.

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Synthesis and Properties of Dimesogenic Compounds Containing Cholesterol and 4‐(trans‐4‐n‐Alkylcyclohexyl)‐benzoic Acid Moieties

Yu¹,

Hou²,

Chen³

et al. 2009

Chin. J. Chem.

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A series of novel dimesogenic compounds containing cholesterol and 4-(trans-4-n-alkylcyclohexyl)benzoic acid moieties were synthesized. The two mesogenic units of these compounds are linked with ω-oxyalkanoyl spacers of varying lengths. The chemical structure and mesomorphic properties of this series of compounds were characterized by FT-IR, MS, 1 H NMR, polarizing optical microscopy (POM) and DSC techniques. The average viscosity and helical twisting power (HTP) in host liquid crystals of selected dimesogenic compounds were also measured. It was found that most of the present novel series of compounds exhibited only cholesteric mesophase with lower phase transition temperatures, and the average viscosity and HTP of selected compounds were similar to or superior to cholesteryl nonylate.

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Cholesterol-based dimeric liquid crystals: synthesis and mesomorphic behaviour

Cited by 60 publications

References 4 publications

Synthesis and characterization of functionalized triblock polymer: The prepared polymer is cholesteryl terminated and chain‐extended PCL

Synthesis and characterization of functionalized triblock polymer: The prepared polymer is cholesteryl terminated and chain‐extended PCL

Low and Wide Phase Transition Temperature Dimesogenic Compounds Consisting of a Cholesteryl and 4-(trans-4-n-Alkylcyclohexyl)phenoxy Mesogens

Synthesis and Properties of Dimesogenic Compounds Containing Cholesterol and 4‐(trans‐4‐n‐Alkylcyclohexyl)‐benzoic Acid Moieties

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