Chemical Reactivity and Catalytic Properties of Binary Gold Clusters: Atom by Atom Tuning in a Gas Phase Approach

2017 ◽  
pp. 325-359
Author(s):  
Sandra M. Lang ◽  
Thorsten M. Bernhardt
Keyword(s):  
Gas Phase ◽  
Catalytic Properties ◽  
Chemical Reactivity ◽  
Gold Clusters ◽  
Phase Approach

scholarly journals Perspective on Diabatic Models of Chemical Reactivity as Illustrated by the Gas-Phase SN2 Reaction of Acetate Ion with 1,2-Dichloroethane

2008 ◽  
Vol 5 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Rosendo Valero ◽  
Lingchun Song ◽  
Jiali Gao ◽  
Donald G. Truhlar
Keyword(s):  
Gas Phase ◽  
Chemical Reactivity ◽  
Sn2 Reaction

SOLVENT EFFECTS ON THE ELECTRONIC STRUCTURE AND NON-LINEAR OPTICAL PROPERTIES OF PYRENE AND SOME OF ITS DERIVATIVES BASED ON DENSITY FUNCTIONAL THEORY

2021 ◽  
Vol 4 (4) ◽  
pp. 236-251
Author(s):  
A. S. Gidado ◽  
L. S. Taura ◽  
A. Musa
Keyword(s):  
Density Functional Theory ◽  
Gas Phase ◽  
Density Functional ◽  
Energy Gap ◽  
Chemical Reactivity ◽  
Basis Set ◽  
Lumo Energy ◽  
Functional Theory ◽  
Organic Optoelectronic ◽  
Homo Lumo

Pyrene (C16H10) is an organic semiconductor which has wide applications in the field of organic electronics suitable for the development of organic light emitting diodes (OLED) and organic photovoltaic cells (OPV). In this work, Density Functional Theory (DFT) using Becke’s three and Lee Yang Parr (B3LYP) functional with basis set 6-311++G(d, p) implemented in Gaussian 03 package was  used to compute total energy, bond parameters, HOMO-LUMO energy gap, electron affinity, ionization potential, chemical reactivity descriptors, dipole moment, isotropic polarizability (α), anisotropy of polarizability ( Δ∝) total first order hyper-polarizability () and second order hyperpolarizability (). The molecules used are pyrene, 1-chloropyrene and 4-chloropyrene  in gas phase and in five different solvents: benzene, chloroform, acetone, DMSO and water. The results obtained show that solvents and chlorination actually influenced the properties of the molecules. The isolated pyrene in acetone has the largest value of HOMO-LUMO energy gap of and is a bit closer to a previously reported experimental value of  and hence is the most stable. Thus, the pyrene molecule has more kinetic stability and can be described as low reactive molecule. The calculated dipole moments are in the order of 4-chloropyrene (1.7645 D) < 1-chloropyrene (1.9663 D) in gas phase. The anisotropy of polarizability ( for pyrene and its derivatives were found to increase with increasing polarity of the solvents.  In a nutshell, the molecules will be promising for organic optoelectronic devices based on their computed properties as reported by this work.

Introducing the concept of pulsed vapor phase copper-free surface click-chemistry using the ALD technique

2019 ◽  
Vol 55 (21) ◽  
pp. 3109-3112 ◽  
Author(s):  
Iva Saric ◽  
Robert Peter ◽  
Maria Kolympadi Markovic ◽  
Ivana Jelovica Badovinac ◽  
Celia Rogero ◽  
...  
Keyword(s):  
Free Surface ◽  
Click Chemistry ◽  
Gas Phase ◽  
Vapor Phase ◽  
Phase Approach

Different from other gas-phase methods, a novel pulsed vapor phase approach to copper-free surface click-chemistry by ALD processing is introduced.

CAPPED METAL CLUSTERS IN THE GAS PHASE

2005 ◽  
Vol 04 (05n06) ◽  
pp. 935-944 ◽  
Author(s):  
JOBIN CYRIAC ◽  
V. R. RAJEEV KUMAR ◽  
T. PRADEEP
Keyword(s):  
Gas Phase ◽  
Chain Length ◽  
Column Chromatography ◽  
Mass Spectra ◽  
Metal Clusters ◽  
Laser Desorption ◽  
Gold Clusters

Alkanethiol protected gold clusters of 29 kDa were prepared and separated by column chromatography. Laser desorption mass spectra of these clusters have been investigated. In the gas phase, monolayer–monolayer interaction leads to clustering of the protected clusters. Role of different matrices and effect of alkanethiol chain length on this process have been investigated.

scholarly journals Synthesis, Characterization, Catalytic Activity, and DFT Calculations of Zn(II) Hydrazone Complexes

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4043 ◽  
Author(s):  
Temiloluwa T. Adejumo ◽  
Nikolaos V. Tzouras ◽  
Leandros P. Zorba ◽  
Dušanka Radanović ◽  
Andrej Pevec ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Gas Phase ◽  
Molecular Orbital ◽  
Density Functional ◽  
Chemical Potential ◽  
Chemical Reactivity ◽  
Geometry Optimization ◽  
Coupling Reaction ◽  
Functional Theory ◽  
Reactivity Descriptors

Two new Zn(II) complexes with tridentate hydrazone-based ligands (condensation products of 2-acetylthiazole) were synthesized and characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy and single crystal X-ray diffraction methods. The complexes 1, 2 and recently synthesized [ZnL3(NCS)2] (L3 = (E)-N,N,N-trimethyl-2-oxo-2-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)ethan-1-aminium) complex 3 were tested as potential catalysts for the ketone-amine-alkyne (KA2) coupling reaction. The gas-phase geometry optimization of newly synthesized and characterized Zn(II) complexes has been computed at the density functional theory (DFT)/B3LYP/6–31G level of theory, while the highest occupied molecular orbital and lowest unoccupied molecular orbital (HOMO and LUMO) energies were calculated within the time-dependent density functional theory (TD-DFT) at B3LYP/6-31G and B3LYP/6-311G(d,p) levels of theory. From the energies of frontier molecular orbitals (HOMO–LUMO), the reactivity descriptors, such as chemical potential (μ), hardness (η), softness (S), electronegativity (χ) and electrophilicity index (ω) have been calculated. The energetic behavior of the investigated compounds (1 and 2) has been examined in gas phase and solvent media using the polarizable continuum model. For comparison reasons, the same calculations have been performed for recently synthesized [ZnL3(NCS)2] complex 3. DFT results show that compound 1 has the smaller frontier orbital gap so, it is more polarizable and is associated with a higher chemical reactivity, low kinetic stability and is termed as soft molecule.

CO oxidation on Rh-doped hexadecagold clusters

2017 ◽  
Vol 7 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Jin-Xun Liu ◽  
Zhiling Liu ◽  
Ivo A. W. Filot ◽  
Yaqiong Su ◽  
Ionut Tranca ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Gold Clusters ◽  
High Mass

Exploring the unique catalytic properties of gold clusters associated with specific nano-architectures is essential for designing improved catalysts with a high mass-specific activity.

scholarly journals Perspective on Diabatic Models of Chemical Reactivity as Illustrated by the Gas-Phase SN2 Reaction of Acetate Ion with 1,2-Dichloroethane

2009 ◽  
Vol 5 (8) ◽  
pp. 2191-2191 ◽  
Author(s):  
Rosendo Valero ◽  
Lingchun Song ◽  
Jiali Gao ◽  
Donald G. Truhlar
Keyword(s):  
Gas Phase ◽  
Chemical Reactivity ◽  
Sn2 Reaction
Sign in / Sign up

Export Citation Format

Share Document