Supramolecular main-chain liquid crystalline polymers with competitive hydrogen bonding: Inclusion of structurally analogous hydrogen bond acceptors and the effects on liquid crystallinity

Carli, John T.; Lindberg, Charles D.; Heltne, Michael D.; Bornowski, Evan C.; John, Eric A.; Wiegel, Kurt N.

doi:10.1080/15421406.2017.1399762

Cited by 5 publications

(2 citation statements)

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“…Carli et al 38 prepared a series of hydrogen bonded liquid crystalline supramolecular copolymers. They synthesized the tetra(ethyleneglycxoy)bis-4-benzoic acid (86) by referring to the literature report by Greuel et al; 39 later, it was mixed with the proton acceptors 1,2-bis(4-pyridyl)ethene (88) and 1,2-bis(4pyridyl)ethane (87) and converted to a molten state for two minutes in nitrogen atmosphere, followed by cooling the mixtures to room temperature to yield the expected complexes.…”

Section: Pyridine-based Molecules As Thermotropic Mesogensmentioning

confidence: 99%

Recent synthetic advances in pyridine-based thermotropic mesogens

Devadiga

Ahipa

2019

RSC Adv.

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Section: Pyridine-based Molecules As Thermotropic Mesogensmentioning

confidence: 99%

Recent synthetic advances in pyridine-based thermotropic mesogens

Devadiga

Ahipa

2019

RSC Adv.

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“…Designing of photosensitive supramolecular liquid crystal materials (SMLCs) through intermolecular hydrogen-bonding interactions are also concerns of our area of interest [6,[21][22][23][24][25][26]. The use of dinitrogen heterocyclic rings (dipyridine) with different nitrogen atom orientations widely improves many characteristics of SMLCs complexes [27,28]. Changes in the characteristics may impact the mesomorphism as well as the properties essential for technical use.…”

Section: Introductionmentioning

confidence: 99%

Induced Wide Nematic Phase by Seven-Ring Supramolecular H-Bonded Systems: Experimental and Computational Evaluation

et al. 2020

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New seven-ring systems of dipyridine derivative liquid crystalline 2:1 supramolecular H-bonded complexes were formed between 4-n-alkoxyphenylazo benzoic acids and 4-(2-(pyridin-4-yl)diazenyl)phenyl nicotinate. Mesomorphic behaviors of the prepared complexes were investigated using a combination of differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fermi bands attributed to the presence of intermolecular H-bond interactions were confirmed by FT–IR spectroscopy. All prepared complexes possessed an enantiotropic nematic phase with a broad temperature nematogenic range. Phases were confirmed by miscibility with a standard nematic (N) compound. A comparison was constructed to investigate the influence of the incorporation of the azophenyl moiety on the mesomeric behavior of corresponding five-membered complexes. It was found that the present complexes observed induced a wide nematic phase with relatively higher temperature ranges than the five aromatic systems. Density functional theory (DFT) suggested the nonlinear geometry of the formed complex. The results of the DFT explained the nematic mesophase formation. Moreover, the π–π stacking of the aromatic moiety in the phenylazo acid plays an effective role in the mesomorphic thermal stability. The energy difference between the frontier molecular orbitals, HOMO (highest occupied) and LUMO (lowest occupied), and the molecular electrostatic potential (MEP) of the prepared complexes were estimated by DFT calculations. The results were used to illustrate the observed nematic phase for all H-bonded supramolecular complexes. Finally, photophysical studies were discussed which were carried out by UV spectroscopy connected to a hot stage.

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