An up-to-date review on halogen-bonded liquid crystals

Devadiga, Deepak; Ahipa, T.N.

doi:10.1016/j.molliq.2021.115961

Cited by 35 publications

(30 citation statements)

References 99 publications

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“…Selective binding of anions is one example. Whereas some of the earlier ditopic receptors made use of H-bonds, more recent work has taken advantage of various sorts of σ-hole bonds to improve on the binding strength and selectivity. − The σ-hole bonds have grown in terms of their impact on synthesis and catalysis, − crystal and polymer design, − ionic liquids, biological activity, − chromatography, and electronic materials …”

Section: Introductionmentioning

confidence: 99%

Dissection of the Origin of π-Holes and the Noncovalent Bonds in Which They Engage

Scheiner

2021

J. Phys. Chem. A

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Accompanying the rapidly growing list of σ-hole bonds has come the acknowledgment of parallel sorts of noncovalent bonds which owe their stability in large part to a deficiency of electron density in the area above the molecular plane, known as a π-hole. The origins of these π-holes are probed for a wide series of molecules, comprising halogen, chalcogen, pnicogen, tetrel, aerogen, and spodium bonds. Much like in the case of their σ-hole counterparts, formation of the internal covalent π-bond in the Lewis acid molecule pulls density toward the bond midpoint and away from its extremities. This depletion of density above the central atom is amplified by an electron-withdrawing substituent. At the same time, the amplitude of the π*-orbital is enhanced in the region of the density-depleted π-hole, facilitating a better overlap with the nucleophile’s lone pair orbital and a stabilizing n → π* charge transfer. The presence of lone pairs on the central atom acts to attenuate the π-hole and shift its position somewhat, resulting in an overall weakening of the π-hole bond. There is a tendency for π-hole bonds to include a higher fraction of induction energy than σ-bonds with proportionately smaller electrostatic and dispersion components, but this distinction is less a product of the σ- or π-character and more a function of the overall bond strength.

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Section: Introductionmentioning

confidence: 99%

Dissection of the Origin of π-Holes and the Noncovalent Bonds in Which They Engage

Scheiner

2021

J. Phys. Chem. A

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“…Intermolecular noncovalent interactions bear an immense technological potential owing to their versatile capability of construction of various complex supramolecular architectures which have found application in drug delivery, [1][2][3] materials engineering, 4,5 catalysis, 6,7 sensors, 6,[8][9][10] biological chemistry, [11][12][13] and many others. [14][15][16] Some prominent noncovalent interactions includes hydrogen bonding (HB), [17][18][19][20][21][22] halogen bonding (XB), 23,24 π-π interaction, [25][26][27] metal ion coordination, [28][29][30][31] hydrophobic interaction, [32][33][34][35] donor-acceptor interaction, [36][37][38] and so on.…”

Section: Introductionmentioning

confidence: 99%

“…[40][41][42][43][44] To date, most research interests are focused on the theoretical and crystallographic characterization of XB and their applications in the solid phase, including crystals engineering, electrical and magnetic materials, and isomers separation systems. 4,45,46 With the rapid development of controllable self-assembly in liquid and solution phases, the increasing number of investigations on the potential application of XB directed self-assembly in the liquid and solution phases (such as liquid crystal (LC), drug design, biological systems, anion recognition, and catalysis) is expected. 6,46,47 In recent years, some research groups have shed light on the study of halogen bonding towards smart materials construction.…”

Section: Introductionmentioning

confidence: 99%

Halogen bonding regulated functional nanomaterials

et al. 2021

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“…Therefore, liquid crystalline molecules exhibit the fluidity of liquid and order of the solid layer. [24][25][26][27][28][29][30][31][32][33] Small liquid crystalline molecules are desirable to use for alignment because of their low viscosity compared to liquid crystalline polymers. Nevertheless, self-assembled structures formed by the small liquid crystalline molecules are not durable and will not deliver the necessary mechanical strength for membrane applications.…”

Section: Liquid Crystal-based Water Treatment Membranesmentioning

confidence: 99%

Liquid Crystal‐Based Water Treatment Membranes

Devadiga

Ahipa

2022

Adv Materials Inter

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Water pollution is on the rise across the world and must be tackled since it leads to water shortage and poor water quality in the near future. Water has been cleaned and renewed using a variety of processes, but each has its own set of limitations. In this context, the membrane technology‐based strategy is one among the various available strategies and, moreover, it has the potentiality to tackle these problems in a more effective way. Furthermore, one of the ongoing challenges in this area of research is to identify the new and cost‐effective membranes for water treatment. Among the newly available various materials, certain materials such as carbon nanotubes and polymerized liquid crystals have attracted a great deal of interest and the pore alignments in these materials is generally a vital factor for the high water permeability, thus the pore alignment can be easily achieved for polymerized liquid crystals than for carbon nanotubes. Therefore, a critical and complete review of emerging trends in liquid crystal‐based polymer membranes for wastewater treatment is presented in this paper. Further, the different types of membranes based on the type of liquid crystal, properties, water treatment performances, advantages, and limitations have been discussed.

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An up-to-date review on halogen-bonded liquid crystals

Cited by 35 publications

References 99 publications

Dissection of the Origin of π-Holes and the Noncovalent Bonds in Which They Engage

Dissection of the Origin of π-Holes and the Noncovalent Bonds in Which They Engage

Halogen bonding regulated functional nanomaterials

Liquid Crystal‐Based Water Treatment Membranes

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