scholarly journals Supramolecular tessellations by the exo-wall interactions of pagoda[4]arene

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiao-Ni Han ◽  
Ying Han ◽  
Chuan-Feng Chen
Keyword(s):  
Charge Transfer ◽  
Supramolecular Chemistry ◽  
Building Block ◽  
Two Dimensional ◽  
Potential Applications ◽  
New Perspective ◽  
Rhombic Tiling ◽  
Tiling Patterns ◽  
Wall Charge ◽  
Wall Interactions

AbstractSupramolecular tessellation has gained increasing interest in supramolecular chemistry for its structural aesthetics and potential applications in optics, magnetics and catalysis. In this work, a new kind of supramolecular tessellations (STs) have been fabricated by the exo-wall interactions of pagoda[4]arene (P4). ST with rhombic tiling pattern was first constructed by P4 itself through favorable π···π interactions between anthracene units of adjacent P4. Notably, various highly ordered STs with different tiling patterns have been fabricated based on exo-wall charge transfer interactions between electron-rich P4 and electron-deficient guests including 1,4-dinitrobenzene, terephthalonitrile and tetrafluoroterephthalonitrile. Interestingly, solvent modulation and guest selection played a crucial role in controlling the molecular arrangements in the co-crystal superstructures. This work not only proves that P4 is an excellent macrocyclic building block for the fabrication of various STs, but also provides a new perspective and opportunity for the design and construction of supramolecular two-dimensional organic materials.

Phosphonoacetic acid as a building block in supramolecular chemistry: salts with organic polyamines

2003 ◽  
Vol 59 (1) ◽  
pp. 87-99 ◽  
Author(s):  
Katharine F. Bowes ◽  
George Ferguson ◽  
Alan J. Lough ◽  
Choudhury M. Zakaria ◽  
Christopher Glidewell
Keyword(s):  
Supramolecular Chemistry ◽  
Building Block ◽  
Three Dimensional ◽  
Neutral Molecule ◽  
Two Dimensional ◽  
Phosphonoacetic Acid ◽  
Acid Component ◽  
A Chain

Phosphonoacetic acid, (HO)2P(O)CH2COOH, forms adducts with a range of amines. The acid component in these adducts may be the neutral molecule C2H5O5P, the mono-anion (C2H4O5P)− or the di-anion (C2H3O5P)2−. The substructure formed by the acid component takes the form of simple chains in compounds (1)–(3), which are the 1:1 adducts formed with 1,4-diazabicyclo[2.2.2]octane, 4,4′-bipyridyl and 1,3-trimethylenedipiperidine, respectively. These adducts contain C2H5O5P, (C2H4O5P)− and (C2H3O5P)2−, respectively, although (3) is solvated by a mixture of methanol and water. The (C2H4O5P)− anion substructure in (4), which is the adduct formed with meso-5,5,7,12,12,14-hexa-C-methyl-1,4,8,11-tetraazacyclotetradecane, is a chain of spiro-fused rings, while the substructure in (5), which is the adduct formed with 2,2′-dipyridylamine, is a chain of edge-fused rings. In (6), the adduct formed with 1,2-bis(4′-pyridyl)ethane, the anion substructure is two-dimensional. The chain substructures are linked by the amine units into two-dimensional structures in (1) and (4) and into three-dimensional frameworks in (2), (3) and (5), while the anion sheets in (6) are likewise linked by the amine units into a three-dimensional framework.

Designed Borophene/TMDs Hybrid Catalysts for Enhanced Hydrogen Evolution Reaction

2021 ◽  
Author(s):  
Yuxing Lin ◽  
Mingxin Yu ◽  
Xiaoyan Li ◽  
weicheng gao ◽  
Licheng Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electronic Properties ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Two Dimensional ◽  
Hybrid Catalysts ◽  
Potential Applications

Interlayer charge transfer in heterostructures plays an important role in tuning the electronic properties, which opens a new avenue for potential applications of two-dimensional nanomaterials. In this work, the hydrogen evolution...

scholarly journals The Triple-Decker Complex [Cp*Fe(µ,η5:η5-P5)Mo(CO)3] as a Building Block in Coordination Chemistry

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 325
Author(s):  
Mehdi Elsayed Moussa ◽  
Stefan Welsch ◽  
Luis Dütsch ◽  
Martin Piesch ◽  
Stephan Reichl ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Transition Metal ◽  
Supramolecular Chemistry ◽  
Coordination Compound ◽  
Building Block ◽  
Fluorine Atom ◽  
Metal Compounds ◽  
X Ray ◽  
New Perspective ◽  
Selective Formation

Although the triple-decker complex [Cp*Fe(µ,η5:η5-P5)Mo(CO)3] (2) was first reported 26 years ago, its reactivity has not yet been explored. Herein, we report a new high-yielding synthesis of 2 and the isolation of its new polymorph (2’). In addition, we study its reactivity towards AgI and CuI ions. The reaction of 2 with Ag[BF4] selectively produces the coordination compound [Ag{Cp*Fe(µ,η5:η5-P5)Mo(CO)3}2][BF4] (3). Its reaction with Ag[TEF] and Cu[TEF] ([TEF]− = [Al{OC(CF3)3}4]−) leads to the selective formation of the complexes [Ag{Cp*Fe(µ,η5:η5-P5)Mo(CO)3}2][TEF] (4) and [Cu{Cp*Fe(µ,η5:η5-P5)Mo(CO)3}2][TEF] (5), respectively. The X-ray structures of compounds 3–5 each show an MI ion (MI = AgI, CuI) bridged by two P atoms from two triple-decker complexes (2). Additionally, four short MI···CO distances (two to each triple-decker complex 2) participate in stabilizing the coordination sphere of the MI ion. Evidently, the X-ray structure for compound 3 shows a weak interaction of the AgI ion with one fluorine atom of the counterion [BF4]−. Such an Ag···F interaction does not exist for compound 4. These findings demonstrate the possibility of using triple-decker complex 2 as a ligand in coordination chemistry and opening a new perspective in the field of supramolecular chemistry of transition metal compounds with phosphorus-rich complexes.

scholarly journals A First-Principle Study of Monolayer Transition Metal Carbon Trichalcogenides

2021 ◽  
Author(s):  
Muhammad Yar Khan ◽  
Yan Liu ◽  
Tao Wang ◽  
Hu Long ◽  
Miaogen Chen ◽  
...  
Keyword(s):  
Phonon Dispersion ◽  
Magnetic Ordering ◽  
Dimensional Structure ◽  
First Principle ◽  
Two Dimensional ◽  
Biaxial Strain ◽  
Half Metallic ◽  
First Principle Calculations ◽  
Potential Applications ◽  
External Strain

AbstractMonolayer MnCX3 metal–carbon trichalcogenides have been investigated by using the first-principle calculations. The compounds show half-metallic ferromagnetic characters. Our results reveal that their electronic and magnetic properties can be altered by applying uniaxial or biaxial strain. By tuning the strength of the external strain, the electronic bandgap and magnetic ordering of the compounds change and result in a phase transition from the half-metallic to the semiconducting phase. Furthermore, the vibrational and thermodynamic stability of the two-dimensional structure has been verified by calculating the phonon dispersion and molecular dynamics. Our study paves guidance for the potential applications of these two mono-layers in the future for spintronics and straintronics devices.

Controllable Synthesis of Ultrathin Layered Transition Metallic Hydroxide/Zeolitic Imidazolate Framework-67 Hybrid Nanosheets for High-Performance Supercapacitors

2021 ◽  
Author(s):  
Chunli Liu ◽  
Yang Bai ◽  
Ji Wang ◽  
Ziming Qiu ◽  
Huan Pang
Keyword(s):  
Charge Transfer ◽  
Energy Conversion ◽  
High Performance ◽  
2D Materials ◽  
Two Dimensional ◽  
Controllable Synthesis ◽  
Zeolitic Imidazolate Framework ◽  
Fast Charge ◽  
Energy Conversion And Storage ◽  
And Storage

Two-dimensional (2D) materials with structures having diverse features are promising for application in energy conversion and storage. A stronger layered orientation can guarantee fast charge transfer along the 2D planes...

scholarly journals Composite Poly(vinyl alcohol)-Based Nanofibers Embedding Differently-Shaped Gold Nanoparticles: Preparation and Characterization

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1604
Author(s):  
Andrea Dodero ◽  
Maila Castellano ◽  
Paola Lova ◽  
Massimo Ottonelli ◽  
Elisabetta Brunengo ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Ad Hoc ◽  
Chemical Reduction ◽  
Chemical Properties ◽  
Single Step ◽  
Gold Nanostructures ◽  
Poly Vinyl Alcohol ◽  
Spherical Nanoparticles ◽  
Potential Applications ◽  
New Perspective

Poly(vinyl alcohol) nanofibrous mats containing ad hoc synthesized gold nanostructures were prepared via a single-step electrospinning procedure and investigated as a novel composite platform with several potential applications. Specifically, the effect of differently shaped and sized gold nanostructures on the resulting mat physical-chemical properties was investigated. In detail, nearly spherical nanoparticles and nanorods were first synthesized through a chemical reduction of gold precursors in water by using (hexadecyl)trimethylammonium bromide as the stabilizing agent. These nanostructures were then dispersed in poly(vinyl alcohol) aqueous solutions to prepare nanofibrous mats, which were then stabilized via a humble thermal treatment able to enhance their thermal stability and water resistance. Remarkably, the nanostructure type was proven to influence the mesh morphology, with the small spherical nanoparticles and the large nanorods leading to thinner well defined or bigger defect-rich nanofibers, respectively. Finally, the good mechanical properties shown by the prepared composite mats suggest their ease of handleability thereby opening new perspective applications.

scholarly journals Synthesis and Photobehavior of a NewDehydrobenzoannulene-Based HOF with Fluorine Atoms: From Solution to Single Crystals Observation

2021 ◽  
Vol 22 (9) ◽  
pp. 4803
Author(s):  
Eduardo Gomez ◽  
Ichiro Hisaki ◽  
Abderrazzak Douhal
Keyword(s):  
Charge Transfer ◽  
Single Crystals ◽  
Parent Compound ◽  
Time Resolved ◽  
Strong Basis ◽  
Triplet Structure ◽  
Carboxylic Groups ◽  
Potential Applications ◽  
A Charge ◽  
Further Development

Hydrogen-bonded organic frameworks (HOFs) are the focus of intense scientific research due their potential applications in science and technology. Here, we report on the synthesis, characterization, and photobehavior of a new HOF (T12F-1(124TCB)) based on a dehydrobenzoannulene derivative containing fluorine atoms (T12F-COOH). This HOF exhibits a 2D porous sheet, which is hexagonally networked via H-bonds between the carboxylic groups, and has an interlayers distance (4.3 Å) that is longer than that of a typical π–π interaction. The presence of the fluorine atoms in the DBA molecular units largely increases the emission quantum yield in DMF (0.33, T12F-COOH) when compared to the parent compound (0.02, T12-COOH). The time-resolved dynamics of T12F-COOH in DMF is governed by the emission from a locally excited state (S1, ~ 0.4 ns), a charge-transfer state (S1(CT), ~ 2 ns), and a room temperature emissive triplet state (T1, ~ 20 ns), in addition to a non-emissive triplet structure with a charge-transfer character (T1(CT), τ = 0.75 µs). We also report on the results using T12F-ester. Interestingly, FLIM experiments on single crystals unravel that the emission lifetimes of the crystalline HOF are almost twice those of the amorphous ones or the solid T12F-ester sample. This shows the relevance of the H-bonds in the photodynamics of the HOF and provides a strong basis for further development and study of HOFs based on DBAs for potential applications in photonics.

Charge transfer in an inhomogeneous two-dimensional electron system in the arrangement of Laughlin’s gedanken experiment

1993 ◽  
Vol 48 (11) ◽  
pp. 8480-8482 ◽  
Author(s):  
V. T. Dolgopolov ◽  
A. A. Shashkin ◽  
G. V. Kravchenko ◽  
S. I. Dorozhkin ◽  
K. von Klitzing
Keyword(s):  
Charge Transfer ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Gedanken Experiment ◽  
Dimensional Electron System

Two-Dimensional Conjugated Microporous Polymers Films: Fabrication Strategies and Potential Applications

2021 ◽  
Author(s):  
Juqing Liu ◽  
Zhengdong Liu ◽  
Yuhang Yin ◽  
Mustafa Eginligil ◽  
Laiyuan Wang ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Microporous Polymers ◽  
The Past ◽  
Potential Applications ◽  
Conjugated Microporous Polymers

Two-dimensional conjugated microporous polymers (2D CMPs) are the sheet/film-like CMPs with amorphous, permanent porous and π-conjugated structures, which have attracted considerable attention over the past few years. Owing to the...

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