THEORETICAL INVESTIGATION ON THE STRUCTURE AND PROPERTIES OF ALUMAZINE⋯M COMPLEXES (M = Li+, Na+, K+, Be2+, Mg2+, AND Ca2+)

2013 ◽  
Vol 12 (05) ◽  
pp. 1350033
Author(s):  
MAHTAB FATHI RASEKH
Keyword(s):  
Charge Transfer ◽  
Chemical Shift ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Interaction Energy ◽  
Natural Bond Orbital ◽  
Energy Charge ◽  
Interaction Energies ◽  
Structure And Properties ◽  
Nucleus Independent Chemical Shift

The nature of alumazine⋯M ( M = Li+ , Na+ , K+ , Be2+ , Mg2+ , AND Ca2+ ) interactions was studied by ab initio calculations. The interaction energies were calculated at MP2/6-311++G(d,p)//B3LYP/6-311++G(d,p) level. The calculations suggest that the size and charge of cation are two important factors that affect the interaction energy, charge transfer values and the variation in aromaticity of alumazine ring upon complexation. The theory of atoms in molecules (AIM) and natural bond orbital (NBO) analyses of complexes indicate that the variation of densities and the extent of charge shifts upon complexation correlate well with the obtained interaction energies. Finally, nucleus independent chemical shift (NICS) method was applied for evaluating the variation in aromaticity of alumazine ring upon complexation.

scholarly journals Theoretical insights into the properties of the borazine… X- complexes (X- = H, F, Cl, CN, NC or NCO)

2009 ◽  
Vol 74 (10) ◽  
pp. 1105-1111 ◽  
Author(s):  
Reza Ghiasi
Keyword(s):  
Charge Transfer ◽  
Chemical Shift ◽  
Total Energy ◽  
Ab Initio ◽  
Intermolecular Interactions ◽  
Natural Bond Orbital ◽  
Nbo Analysis ◽  
Interaction Energies ◽  
Ab Initio Method ◽  
Nucleus Independent Chemical Shift

The character of the NH ...X- (X- = H, F, Cl, CN, NC or NCO) interactions of borazine with anions was studied using ab initio method. The interaction energies were calculated at the B3LYP/6-311++G(d,p) level. The energetic and geometric characteristics of the complexes were compared. The 'atoms in molecules' methodology was used to analyze the electron density and to obtain atomic contributions to the total energy and charge of the systems. Natural bond orbital (NBO) analysis demonstrated the charge transfer in the study of the nature of the intermolecular interactions. The aromaticity of these compounds was predicted in light of the nucleus-independent chemical shift (NICS).

Ab-Initio Calculations of the Electronic Structure and Properties of Titanium Carbosulfide

1995 ◽  
Vol 408 ◽  
Author(s):  
Bala Ramalingam ◽  
Michael E. McHenry ◽  
Warren M. Garrison ◽  
James M. MacLaren
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Ground State ◽  
Manganese Sulfide ◽  
Structure And Properties ◽  
Host Matrix ◽  
Inclusion Phase ◽  
Equilibrium Lattice Constant ◽  
Volume Curve ◽  
Titanium Carbosulfide

AbstractTitanium carbosulfide (Ti2CS) is frequently found as an inclusion phase in Ti - containing steels. It is of considerable interest because, whenever present in preference to the more common manganese sulfide (MnS), it significantly improves the toughness (a very desirable property) of the steel. Currently, to the best of our knowledge, there is no data, either computational or experimental, regarding the structural properties of Ti2CS. This data is needed to understand the influence of the Ti2CS inclusions on the toughness of the host material.In this paper, our results from the ab-initio calculations, using the LKKR-ASA (Layer Korringa Kohn Rostoker method in the Atomic Spheres Approximation) on the equilibrium ground state properties of bulk Ti2CS are presented and discussed. In particular, attention is focused upon (a) the Energy – Atomic Volume curve generated to calculate the equilibrium lattice constant and the bulk modulus, and (b) the density of states calculations. The application of these results to the subsequent study of an interface involving the carbosulfide and the host matrix is also illustrated.

Insight into the halogen-bond nature of noble gas-chlorine systems by molecular beam scattering experiments, ab initio calculations and charge displacement analysis

2019 ◽  
Vol 21 (14) ◽  
pp. 7330-7340 ◽  
Author(s):  
Francesca Nunzi ◽  
Diego Cesario ◽  
Leonardo Belpassi ◽  
Francesco Tarantelli ◽  
Luiz F. Roncaratti ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Molecular Beam ◽  
Halogen Bond ◽  
Noble Gas ◽  
Molecular Beam Scattering ◽  
Beam Scattering ◽  
Charge Displacement ◽  
Insight Into

A weak halogen bond, together with charge transfer from a noble gas to Cl2, characterizes the intermolecular interaction between a noble gas atom and Cl2 in a collinear configuration.

scholarly journals Structure and properties of CoCrFeNiX multi-principal element alloys from ab initio calculations

2020 ◽  
Vol 127 (14) ◽  
pp. 145102 ◽  
Author(s):  
Natalia E. Koval ◽  
Joseba Iñaki Juaristi ◽  
Ricardo Díez Muiño ◽  
Maite Alducin
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Structure And Properties ◽  
Principal Element

Ultrafast Charge Transfer Studied by Femtosecond IR-Spectroscopy and ab Initio Calculations

2000 ◽  
Vol 47 (4A) ◽  
pp. 721-728 ◽  
Author(s):  
Andreas Kummrow ◽  
Jens Dreyer ◽  
Christian Chudoba ◽  
Jens Stenger ◽  
Erik Theodorus ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Ir Spectroscopy ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Ultrafast Charge Transfer

An extended DFTB-CI model for charge-transfer excited states in cationic molecular clusters: model studies versus ab initio calculations in small PAH clusters

2016 ◽  
Vol 18 (5) ◽  
pp. 3545-3557 ◽  
Author(s):  
Léo Dontot ◽  
Nicolas Suaud ◽  
Mathias Rapacioli ◽  
Fernand Spiegelman
Keyword(s):  
Charge Transfer ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Excited States ◽  
Configuration Interaction ◽  
Density Functional ◽  
Tight Binding ◽  
Molecular Clusters ◽  
Molecular Cluster ◽  
Model Studies

We present an extension of the constrained density functional tight binding scheme combined with configuration interaction (DFTB-CI) to efficiently compute excited states of molecular cluster cations.

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