A cyano-bridged molecular magnet with a novel two-dimensional brick wall structure

2000 ◽  
pp. 1309-1310 ◽  
Author(s):  
Hui-Zhong Kou ◽  
Song Gao ◽  
Bao-Qing Ma ◽  
Dai-Zheng Liao
Keyword(s):  
Wall Structure ◽  
Molecular Magnet ◽  
Brick Wall ◽  
Two Dimensional

scholarly journals A two-dimensional copper(I) coordination polymer based on 1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one

2017 ◽  
Vol 73 (11) ◽  
pp. 1782-1785
Author(s):  
Hyunjin Park ◽  
Jineun Kim ◽  
Hansu Im ◽  
Tae Ho Kim
Keyword(s):  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Wall Structure ◽  
Brick Wall ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Iodide Ions ◽  
Π Interactions

The reaction of copper(I) iodide with 1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one (L, C13H19NOS) in acetonitrile/dichloromethane results in a crystalline coordination polymer, namely poly[bis{μ2-1-[2-(cyclohexylsulfanyl)ethyl]pyridin-2(1H)-one}tetra-μ3-iodidotetracopper(I)], [Cu4I4L2]n. The asymmetric unit comprises two ligand molecules, four copper(I) ions and four iodide ions. Interestingly, the O atoms are bound to the soft copper(I) ions. The stair-step clusters of Cu and I atoms in the asymmetric unit are linked repeatedly, giving rise to infinite chains along [100]. Neighbouring infinite chains are linked through theLmolecules, forming a two-dimensional brick-wall structure. These two-dimensional networks are stacked alternately along [001]. Additionally, there are intermolecular C—H...I hydrogen bonds and C—H...π interactions between the ligands.

Assembly of C-propyl-pyrogallol[4]arene with bipyridine-based spacers and solvent molecules

2020 ◽  
Vol 75 (4) ◽  
pp. 341-345
Author(s):  
Xiao-Li Liu ◽  
Jing-Long Liu ◽  
Hong-Mei Yang ◽  
Ai-Quan Jia ◽  
Qian-Feng Zhang
Keyword(s):  
Mixed Solvent ◽  
Polymer Structure ◽  
Brick Wall ◽  
Two Dimensional ◽  
One Dimensional ◽  
X Ray ◽  
X Ray Crystallography ◽  
Wave Trough ◽  
Hydrogen Bonding Networks ◽  
Solvent Molecules

AbstractCo-crystallization of C-propyl-pyrogallol[4]arene (PgC3) with 4,4′-bipyridine (bpy) in ethanol afforded a multi-component complex (PgC3) · 3(bpy) ·(EtOH) (1) that consists of a one-dimensional brick-wall framework, which was formed by four pyrogallol[4]arene molecules and two juxtaposed bpy molecules, entrapping two other bpy molecules as guests within each cavity. Heating a mixture of PgC3 and trans-1,2-bis-(4-pyridyl)ethylene (bpe) in an ethanol-water mixed solvent allowed the isolation of a multi-component complex (PgC3) ·(bpe) · 2(EtOH) ·(H2O) (2), which has a two-dimensional wave-like polymer structure with the bpe molecules embedded in the wave trough between two PgC3 molecules. Single-crystal X-ray crystallography was utilized to investigate the hydrogen bonding networks of the multi-component complexes 1 and 2.

Multifunctional films with a highly oriented “nano-brick wall” structure by regulating modified TiO2@graphene oxide/poly(vinyl alcohol) nanocomposites

Nanoscale ◽  
2019 ◽  
Vol 11 (15) ◽  
pp. 7424-7432 ◽  
Author(s):  
Shumeng Bi ◽  
Ling Zhang ◽  
Chunzhong Li
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Wall Structure ◽  
Poly Vinyl Alcohol ◽  
Brick Wall

A multifunctional film based on a modified TiO2@GO/PVA nanocomposite with a multilayer nano-brick wall structure is fabricated by a facile approach.

ENTROPY OF A NONSTATIC BLACK HOLE

2000 ◽  
Vol 15 (28) ◽  
pp. 1739-1747 ◽  
Author(s):  
LI XIANG ◽  
ZHAO ZHENG
Keyword(s):  
Black Hole ◽  
Black Hole Entropy ◽  
Time Dependent ◽  
Brick Wall ◽  
Two Dimensional ◽  
De Sitter ◽  
Wall Model ◽  
New Model ◽  
Brick Wall Model ◽  
Dynamical Degrees

We point out that the brick-wall model cannot be applied to the nonstatic black hole. In the case of a static hole, we propose a new model where the black hole entropy is attributed to the dynamical degrees of the field covering the two-dimensional membrane just outside the horizon. A cutoff different from the model of 't Hooft is necessarily introduced. It can be treated as an increase in horizon because of the space–time fluctuations. We also apply our model to the nonequilibrium and nonstatic cases, such as Schwarzschild–de Sitter and Vaidya space–times. In the nonstatic case, the entropy relies on a time-dependent cutoff.

scholarly journals Stucco repair method for enclosing brick walls

2019 ◽  
Vol 135 ◽  
pp. 03047
Author(s):  
Alexandr Zholobov ◽  
Nadezhda Ivannikova ◽  
Olga Razinkova ◽  
Peter Dukhanin
Keyword(s):  
High Efficiency ◽  
Wall Structure ◽  
Brick Wall ◽  
Test Results ◽  
Repair Method ◽  
Internal Surfaces ◽  
Strong Adhesion ◽  
Additional Process ◽  
The Russian Federation ◽  
Repair Techniques

During the operation of buildings, plaster coatings of the external and internal enclosing surfaces of brick walls are subjected to various destructive influences. Existing methods of repairing plaster coatings do not fully ensure strong adhesion of the material of the repair layer of plaster to the surface of the repaired brick wall structure. In addition, these methods can only get rid of damage but do not improve the operational properties of the plaster layer of the repaired structure. Thus, the urgent problem is the development of an effective method of repairing plaster coatings on the surfaces of brick walls, due to which it will become possible to ensure the monolithic of the repaired plastering structure. In order to address the shortcomings of the existing plaster coating repair techniques on the surfaces of the brick walls and finding ways to improve it, by the authors investigated the possibility and the expediency of performing the repair of additional process steps. A feature of this repair method is the use of preheated plaster mortar, flexible plaster molding, as well as compaction of the stucco mortar in the contact area with the repaired brick wall structure with a deep plate compactor. The test results of samples of plaster coatings manufactured by the proposed method showed the high efficiency and feasibility of using this method for repairs on the external and internal surfaces of walling of brick walls and are mentioned in the patent for the invention of the Russian Federation. The performance characteristics of the plaster are significantly increased as a result of the application of this method, and, consequently, the service life of the plaster coating is increased several times.

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