Modelling Charge Transfer in Weak Chemical Bonds: Insights from the Chemistry of Helium

ChemPhysChem ◽  
2018 ◽  
Vol 19 (12) ◽  
pp. 1476-1485 ◽  
Author(s):  
Francesca Nunzi ◽  
Diego Cesario ◽  
Fernando Pirani ◽  
Leonardo Belpassi ◽  
Francesco Tarantelli
Keyword(s):  
Charge Transfer ◽  
Chemical Bonds ◽  
Weak Chemical

Zur Kristallchemie von Graphen und Graphit

2009 ◽  
Vol 66 (1) ◽  
pp. 81-83
Author(s):  
M. Trömel
Keyword(s):  
Crystal Structure ◽  
Chemical Properties ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Chemical Bonds ◽  
Graphene Layers ◽  
Layer Graphene ◽  
Closest Packing ◽  
Weak Chemical ◽  
And Chemical Properties

The crystal structure of single-layer graphene in comparison to graphite is discussed with regard to its crystallographic and chemical properties. In both of these polymorphs of carbon, the atomic volume of carbon, reduced to the closest packing of atoms, is practically the same and considerably smaller than in diamond. This indicates pentavalent carbon in graphene as well as in graphite. The observed elastic corrugations of the graphene layers which probably cause their amazing rigidity seem to be due to numerous weak chemical bonds within the layers.

scholarly journals Characterization of weak chemical bonds in highly strained and hypervalent compounds

2008 ◽  
Vol 64 (a1) ◽  
pp. C70-C70
Author(s):  
D. Hashizume ◽  
N. Suzuki ◽  
T. Chihara ◽  
Y. Yamamoto
Keyword(s):  
Chemical Bonds ◽  
Highly Strained ◽  
Weak Chemical

scholarly journals Role of interfacial charge transfer process in the graphene-ZnO-MoO3 core-shell nanoassemblies for efficient disinfection of industrial effluents

2019 ◽  
Vol 13 (4) ◽  
pp. 376-386
Author(s):  
Rakkesh Ajay ◽  
Dhinasekaran Durgalakshmi ◽  
Ponnuraj Karthe ◽  
Subramanian Balakumar
Keyword(s):  
Charge Transfer ◽  
Photocatalytic Performance ◽  
Graphene Nanosheets ◽  
Electronic Conductivity ◽  
Reaction Medium ◽  
Core Shell ◽  
Chemical Bonds ◽  
Interfacial Charge Transfer ◽  
Synthesis Strategy ◽  
Interfacial Charge

A combined wet chemical strategy was adopted to fabricate size controllable ZnO-MoO3 core-shell nanostructures by varying the surface potential in the reaction medium. The layered MoO3 was adsorbed on the surface of ZnO particles by electrostatic interaction and simultaneously anchored onto graphene nanosheets (GNS) by chemical bonds. The sunlight induced photocatalytic phenomena of the GNS-ZnO-MoO3 hybrid nanoassemblies have been examined by photodegradation of harmful organic pollutant. As a result, the as-synthesized GNS-ZnO-MoO3 hybrid nanoassemblies showed a better photocatalytic performance towards acridine orange dye (AO). The efficient photocatalytic performance was due to the interfacial charge transfer processes between GNS and ZnO-MoO3 that improves the electronic conductivity of the hybrid nanostructure. Moreover, the chemical bonds formed between the MoO3 shells and GNS efficiently hinder the recombination loss of photogenerated charges. This synthesis strategy was very simple, effective and can be extended to assembling other ternary nanostructures with enhanced photodegradation performance.

scholarly journals Ultrafast photoactivation of C─H bonds inside water-soluble nanocages

2019 ◽  
Vol 5 (2) ◽  
pp. eaav4806 ◽  
Author(s):  
Ankita Das ◽  
Imon Mandal ◽  
Ravindra Venkatramani ◽  
Jyotishman Dasgupta
Keyword(s):  
Charge Transfer ◽  
Degrees Of Freedom ◽  
Bond Cleavage ◽  
Electron Transfer Reaction ◽  
Water Soluble ◽  
Charge Transfer Complexes ◽  
Chemical Bonds ◽  
Proton Coupled Electron Transfer ◽  
Selective Reaction ◽  
Carbon Centered Radical

Light energy absorbed by molecules can be harnessed to activate chemical bonds with extraordinary speed. However, excitation energy redistribution within various molecular degrees of freedom prohibits bond-selective chemistry. Inspired by enzymes, we devised a new photocatalytic scheme that preorganizes and polarizes target chemical bonds inside water-soluble cationic nanocavities to engineer selective functionalization. Specifically, we present a route to photoactivate weakly polarized sp3C─H bonds in water via host-guest charge transfer and control its reactivity with aerial O2. Electron-rich aromatic hydrocarbons self-organize inside redox complementary supramolecular cavities to form photoactivatable host-guest charge transfer complexes in water. An ultrafast C─H bond cleavage within ~10 to 400 ps is triggered by visible-light excitation, through a cage-assisted and solvent water–assisted proton-coupled electron transfer reaction. The confinement prolongs the lifetime of the carbon-centered radical to enable a facile yet selective reaction with molecular O2leading to photocatalytic turnover of oxidized products in water.

Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature

2020 ◽  
Vol 7 (10) ◽  
pp. 2031-2042
Author(s):  
Wenna Li ◽  
Lang He ◽  
Xue Bai ◽  
Lujia Liu ◽  
Muhammad Ikram ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Bonds ◽  
Sensing Performance

S-Doped biomorphic SnO2 with active S-terminations and S–Sn–O chemical bonds has significantly improved gas sensing performance to NO2 at room temperature.

Zu einer Bindungslängen-Kristallchemie

1992 ◽  
Vol 200 (3-4) ◽  
Author(s):  
Martin Trömel
Keyword(s):  
Electrical Conductivity ◽  
Bond Strength ◽  
Bond Length ◽  
Chemical Bonds ◽  
Ionic Radii ◽  
Interatomic Distances ◽  
Secondary Bonds ◽  
Oxidizing Power ◽  
Oxygen Bond ◽  
Weak Chemical

AbstractFundamentals of a bond length based crystal chemistry which emerges from the bond valence method and goes beyond the concept of ionic radii are discussed. In many cases, atomic distances can serve as a measure of chemical bonding. Unobserved interatomic distances and ionic radii can be predicted from bond-length – bond-strength relationships. Electrical conductivity appears to be connected with peculiarities of bondlengths. The oxidizing power of oxides and oxo-complexes seems to be correlated with oxygen bond-lengths. Secondary bonds and intermolecular interactions appear as weak chemical bonds.

Interaction between Carbon Nanotube and Mg Surface: Ab-Initio Investigation

2007 ◽  
Vol 546-549 ◽  
pp. 481-484
Author(s):  
Jian Feng Wan ◽  
Yan Qiong Fei ◽  
Jian Nong Wang
Keyword(s):  
Charge Transfer ◽  
Carbon Nanotube ◽  
Ab Initio ◽  
Density Of States ◽  
Electronic Structures ◽  
Metal Surfaces ◽  
Bond Order ◽  
Chemical Bonds ◽  
Single Walled Carbon Nanotube ◽  
Work Functions

ab-initio calculations on the interaction between the single-walled carbon nanotube (SWCN) and the Mg (0001) surface have been reported. It was found that the charge transfer from metal surfaces to the nanotubes takes place depending on both the electronic structures of the nanotubes and the work functions of the metal surfaces. The stable geometries for the nanotube between two consecutive objectives with C-Mg chemical bonds formed. The interaction energy in the most stable geometry is found to be CNT’s structural dependence. Concerning the electronic properties, the most stable structure showed a decrease in the density of states near the Fermi level due to the formation of C-Mg bonds enhancing the metallic character of the nanotube by the contact with the surface. The nature of the nanotube-interface interaction for nanotubes of larger diameters has been also discussed based on the calculated bond order.

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