An Introduction to Hydrogen Bonding By George A. Jeffrey (University of Pittsburgh). Oxford University Press:  New York and Oxford. 1997. ix + 303 pp. $60.00. ISBN 0-19-509549-9.

“…H-bond is a directional dipole-dipole bond between an electronegative atom and a hydrogen atom bonded to hetero atom with lone pair of electrons, such as oxygen, fluorine or nitrogen. Jeffrey [119] classified H-bonds with a donor-acceptor distance of 2.2-2.5 Å as strong and mostly covalent, of 2.5-3.2 Å as moderate and mostly electrostatic, and of 3.2-4.0 Å as weakly electrostatic with their corresponding energies as 40-14, 15-4, and less than 4 kcal mol À [1] respectively. Despite being 10 times weaker compared to carbon-carbon (CÀ C) bonds (3 45 kJ mol À 1 ), [120] the H-bonding is strongest among the noncovalent interactions and its directionality and high per-volume concentration confers acceptable mechanical strength and significantly affects the viscoelastic and self-healing properties of PNCs.…”

Section: Hydrogen-bonding In Self-healing Materialsmentioning

confidence: 99%

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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Polymers and polymer nanocomposites (PNCs) are extensively used in daily life. However, the growing requirement of advanced PNCs laid persistent environmental issues due to deformation‐induced damage that once formed, does not vanish at future stages. Therefore, self‐healing materials with significantly enhanced long life and safety have been designed to epitomize the forefront of recent advances in materials chemistry and engineering. Self‐healing PNC (SH‐PNCs) materials are a class of smart composites in which nanoparticles induce interfacial reconstruction via multiple covalent and non‐covalent interactions culminating in improved mechanical strength and self‐healing capability. However, since the filler nanoparticles are independent of the reversible supramolecular network, the filler incorporation destroys the self‐healing ability but could enhance the mechanical strength. Hence, the molecular parameters controlling the alliance of robust mechanical strength with virtuous self‐healing ability is a crucial challenge. Herein, we review the latest developments that have been made in self‐healing materials and puts advancing insights into the fabrication of SH‐PNCs in which the combination of covalent bonds and non‐covalent interactions provides an optimal balance between their mechanical performance and self‐healing capability. We highlight the importance of specific entropic, enthalpic changes, polymer chain conformations and flexibility that enable the reconstruction of damaged surface and physical reshuffling of dynamic bonds at the interface of cut surfaces.

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“…These interactions were observed between the 3′‐hydroxyl from the guanine (G14) in layer 1 and two phosphate backbone oxygens from adenine (A5) in layer 3, with each base belonging to strand S3 of the system (Figure A and Figure B). Hydrogen bonds with such strong and weak polar interactions are not without precedent, and we questioned whether or not they somehow worked in concert to influence the rhombohedral crystal packing, or if the close polar contact (PC) between layers was somehow a result of the DNA sequence at that site. To probe the possibility that the bases involved in the interaction were culpable, we prepared crystals containing a single base substitution at each position (G14‐T & A5‐C), and solved the PC variant structure to 2.95 Å.…”

Section: Resultsmentioning

confidence: 99%

A Self‐Assembled Rhombohedral DNA Crystal Scaffold with Tunable Cavity Sizes and High‐Resolution Structural Detail

et al. 2020

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DNAisanideal molecule for the construction of 3D crystals with tunable properties owingt oi ts high programmability based on canonical Watson-Crickb ase pairing,w ith crystal assembly in all three dimensions facilitated by immobile Holliday junctions and stickye nd cohesion. Despite the promise of these systems,o nly ah andful of unique crystal scaffolds have been reported. Herein, we describe anew crystal system with arepeating sequence that mediates the assembly of a3Dscaffold via aseries of Holliday junctions linked together with complementary stickye nds.B yu sing an optimized junction sequence,w ec ould determine ah igh-resolution (2.7)structure containing R3 crystal symmetry,with aslight subsequent improvement (2.6)u sing am odified sticky-end sequence.T he immobile Holliday junction sequence allowed us to produce crystals that provided unprecedented atomic detail. In addition, we expanded the crystal cavities by 50 %by adding an additional helical turn between junctions,a nd we solved the structure to 4.5 resolution by molecular replacement.

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An Introduction to Hydrogen Bonding By George A. Jeffrey (University of Pittsburgh). Oxford University Press: New York and Oxford. 1997. ix + 303 pp. $60.00. ISBN 0-19-509549-9.

Cited by 68 publications

References 0 publications

Intramolecular hydrogen-bonding in a cobalt aqua complex and electrochemical water oxidation activity

Intramolecular hydrogen-bonding in a cobalt aqua complex and electrochemical water oxidation activity

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

A Self‐Assembled Rhombohedral DNA Crystal Scaffold with Tunable Cavity Sizes and High‐Resolution Structural Detail

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