Dynamics of Grain Boundaries in Two-Dimensional Hydrogen-Bonded Molecular Networks

Small ◽  
2005 ◽  
Vol 1 (5) ◽  
pp. 532-539 ◽  
Author(s):  
Markus Lackinger ◽  
Stefan Griessl ◽  
Lorenz Kampschulte ◽  
Ferdinand Jamitzky ◽  
Wolfgang M. Heckl
Keyword(s):  
Grain Boundaries ◽  
Molecular Networks ◽  
Two Dimensional ◽  
Hydrogen Bonded

Reversible Switching of a Single-Dipole Molecule Imbedded in Two-Dimensional Hydrogen-Bonded Binary Molecular Networks

2014 ◽  
Vol 118 (3) ◽  
pp. 1712-1718 ◽  
Author(s):  
Jia Lin Zhang ◽  
Ji Lian Xu ◽  
Tian Chao Niu ◽  
Yun Hao Lu ◽  
Lei Liu ◽  
...  
Keyword(s):  
Molecular Networks ◽  
Two Dimensional ◽  
Dipole Molecule ◽  
Single Dipole ◽  
Hydrogen Bonded

Hydrogen-bonding networks of purine derivatives and their bilayers for guest intercalation

CrystEngComm ◽  
2016 ◽  
Vol 18 (1) ◽  
pp. 62-67
Author(s):  
Yoona Jang ◽  
Seo Yeon Yoo ◽  
Hye Rin Gu ◽  
Yu Jin Lee ◽  
Young Shin Cha ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Two Dimensional ◽  
Purine Derivatives ◽  
Guest Molecules ◽  
Π Interactions ◽  
Hydrogen Bonding Networks ◽  
Hydrogen Bonded

6-Chloro-9-propyl-purin-2-amine (pr-GCl) forms two-dimensional hydrogen-bonded networks which in turn stack via π–π interactions, leading to the formation of bilayers that can accommodate organic guest molecules.

Structural study of six cycloalkylammonium cinnamate salt structures featuring one-dimensional columns and two-dimensional hydrogen-bonded networks

2012 ◽  
Vol 68 (5) ◽  
pp. o188-o194 ◽  
Author(s):  
Andreas Lemmerer ◽  
Manuel A. Fernandes
Keyword(s):  
Hydrogen Bonds ◽  
Structural Study ◽  
Two Dimensional ◽  
One Dimensional ◽  
Dimensional Network ◽  
Polymorphic Forms ◽  
Whole Molecule Disorder ◽  
Hydrogen Bonded

Six ammonium carboxylate salts, namely cyclopentylammonium cinnamate, C5H12N+·C9H7O2−, (I), cyclohexylammonium cinnamate, C6H14N+·C9H7O2−, (II), cycloheptylammonium cinnamate form I, C7H16N+·C9H7O2−, (IIIa), and form II, (IIIb), cyclooctylammonium cinnamate, C8H18N+·C9H7O2−, (IV), and cyclododecylammonium cinnamate, C12H26N+·C9H7O2−, (V), are reported. Salts (II)–(V) all have a 1:1 ratio of cation to anion and feature three N+—H...O−hydrogen bonds forming one-dimensional hydrogen-bonded columns consisting of repeatingR43(10) rings, while salt (I) has a two-dimensional network made up of alternatingR44(12) andR68(20) rings. Salt (III) consists of two polymorphic forms,viz.form I havingZ′ = 1 and form II withZ′ = 2. The latter polymorph has disorder of the cycloheptane rings in the two cations, as well as whole-molecule disorder of one of the cinnamate anions. A similar, but ordered,Z′ = 2 structure is seen in salt (IV).

Hydrogen-bonded two-dimensional sheet construction in the 1∶1 adduct between 2-cyanoguanidine and 2-(N-cyano)imino-4,6-dimethylpyrimidine

CrystEngComm ◽  
2002 ◽  
Vol 4 (94) ◽  
pp. 568-573 ◽  
Author(s):  
Daniel J. Quinlan ◽  
Alexander J. Blake ◽  
Peter Hubberstey
Keyword(s):  
Two Dimensional ◽  
Hydrogen Bonded

Research on Micro-Mechanism of Nanocomposite Ceramic in Two-Dimensional Ultrasound Grinding

2007 ◽  
Vol 359-360 ◽  
pp. 344-348 ◽  
Author(s):  
Bo Zhao ◽  
Yan Wu ◽  
Guo Fu Gao ◽  
Feng Jiao
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Deformation Mechanism ◽  
Ground Surface ◽  
Grain Boundary Sliding ◽  
Second Phase ◽  
Two Dimensional ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Boundary Sliding

Surface microstructure of nano-composite ceramics prepared by mixed coherence system and machined by two-dimensional ultrasonic precision grinding was researched using TEM, SEM, XRD detector and other equipments. Structure, formation mechanism and characteristic of metamorphic layer of ground surface of nano-composite ceramics were researched. The experiment shows micro deformation mechanism of ceramic material in two-dimensional ultrasound grinding is twin grain boundary and grain-boundary sliding for Al2O3, and it is crystal dislocation of enhanced phase, matrix grain boundary sliding, coordination deformation of intergranular second phase as well as its deformation mechanism for nano-composite ceramics. The fracture surfaces of nano-composite materials with different microscopic structure were observed using TEM and SEM. Research shows that ZrO2 plays an important influence on the generation and expansion of crack, and enhances the strength of grain boundaries. When grain boundaries is rich in the ZrO2 particles, the crack produced in grinding process will be prevented, and the surface with plastic deformation will be smooth. The results shows nanoparticles dispersed in grain boundary prevents crack propagation and makes materials fracture transgranularly which makes the processed surface fine.

Relaxations of Hydrogen-Bonded Liquids Confined in Two-Dimensional Vermiculite Clay

2004 ◽  
Vol 108 (31) ◽  
pp. 11596-11603 ◽  
Author(s):  
Silvina Cerveny ◽  
Johan Mattsson ◽  
Jan Swenson ◽  
Rikard Bergman
Keyword(s):  
Two Dimensional ◽  
Vermiculite Clay ◽  
Hydrogen Bonded

Polymorphs of phenazine hexacyanoferrate(II) hydrate: supramolecular isomerism in a 2D hydrogen-bonded network

2021 ◽  
Vol 77 (2) ◽  
pp. 211-218
Author(s):  
Ivica Cvrtila ◽  
Vladimir Stilinović
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
The Other ◽  
Two Dimensional ◽  
Structural Motifs ◽  
Supramolecular Isomerism ◽  
Other Hand ◽  
Π Stacking ◽  
Hydrogen Bonded

The crystal structures of two polymorphs of a phenazine hexacyanoferrate(II) salt/cocrystal, with the formula (Hphen)3[H2Fe(CN)6][H3Fe(CN)6]·2(phen)·2H2O, are reported. The polymorphs are comprised of (Hphen)2[H2Fe(CN)6] trimers and (Hphen)[(phen)2(H2O)2][H3Fe(CN)6] hexamers connected into two-dimensional (2D) hydrogen-bonded networks through strong hydrogen bonds between the [H2Fe(CN)6]2− and [H3Fe(CN)6]− anions. The layers are further connected by hydrogen bonds, as well as through π–π stacking of phenazine moieties. Aside from the identical 2D hydrogen-bonded networks, the two polymorphs share phenazine stacks comprising both protonated and neutral phenazine molecules. On the other hand, the polymorphs differ in the conformation, placement and orientation of the hydrogen-bonded trimers and hexamers within the hydrogen-bonded networks, which leads to different packing of the hydrogen-bonded layers, as well as to different hydrogen bonding between the layers. Thus, aside from an exceptional number of symmetry-independent units (nine in total), these two polymorphs show how robust structural motifs, such as charge-assisted hydrogen bonding or π-stacking, allow for different arrangements of the supramolecular units, resulting in polymorphism.

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