Hydration Effect on Amide I Infrared Bands in Water: An Interpretation Based on an Interaction Energy Decomposition Scheme

2014 ◽  
Vol 119 (29) ◽  
pp. 9056-9067 ◽  
Author(s):  
Marwa H. Farag ◽  
Manuel F. Ruiz-López ◽  
Adolfo Bastida ◽  
Gérald Monard ◽  
Francesca Ingrosso
Keyword(s):  
Interaction Energy ◽  
Energy Decomposition ◽  
Decomposition Scheme ◽  
Hydration Effect

scholarly journals Unravelling the Interactions of Magnetic Ionic Liquids by Energy Decomposition Schemes: Towards a Transferable Polarizable Force Field

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5526
Author(s):  
Iván González-Veloso ◽  
Nádia M. Figueiredo ◽  
M. Natália D. S. Cordeiro
Keyword(s):  
Ionic Liquids ◽  
Force Field ◽  
Interaction Energy ◽  
Energy Decomposition ◽  
Polarizable Force Field ◽  
Decomposition Scheme ◽  
Magnetic Ionic Liquids ◽  
Optimal Separation ◽  
Set Up ◽  
Decomposition Schemes

This work aims at unravelling the interactions in magnetic ionic liquids (MILs) by applying Symmetry-Adapted Perturbation Theory (SAPT) calculations, as well as based on those to set-up a polarisable force field model for these liquids. The targeted MILs comprise two different cations, namely: 1-butyl-3-methylimidazolium ([Bmim]+) and 1-ethyl-3-methylimidazolium ([Emim]+), along with several metal halides anions such as [FeCl4]−, [FeBr4]−, [ZnCl3]− and [SnCl4]2− To begin with, DFT geometry optimisations of such MILs were performed, which in turn revealed that the metallic anions prefer to stay close to the region of the carbon atom between the nitrogen atoms in the imidazolium fragment. Then, a SAPT study was carried out to find the optimal separation of the monomers and the different contributions for their interaction energy. It was found that the main contribution to the interaction energy is the electrostatic interaction component, followed by the dispersion one in most of the cases. The SAPT results were compared with those obtained by employing the local energy decomposition scheme based on the DLPNO-CCSD(T) method, the latter showing slightly lower values for the interaction energy as well as an increase of the distance between the minima centres of mass. Finally, the calculated SAPT interaction energies were found to correlate well with the melting points experimentally measured for these MILs.

scholarly journals Energy decomposition analysis approaches and their evaluation on prototypical protein–drug interaction patterns

2015 ◽  
Vol 44 (10) ◽  
pp. 3177-3211 ◽  
Author(s):  
Maximillian J. S. Phipps ◽  
Thomas Fox ◽  
Christofer S. Tautermann ◽  
Chris-Kriton Skylaris
Keyword(s):  
Drug Interaction ◽  
Charge Transfer ◽  
Interaction Energy ◽  
Decomposition Analysis ◽  
Energy Decomposition Analysis ◽  
Chemical Components ◽  
Protein Drug ◽  
Interaction Patterns ◽  
Energy Decomposition

The partitioning of the interaction energy into chemical components such as electrostatics, polarization, and charge transfer is possible with energy decomposition analysis approaches. We review and evaluate these for biomolecular applications.

Implementation of the interacting quantum atoms energy decomposition with the CASPT2 method

2021 ◽  
Author(s):  
Jesús Jara-Cortés ◽  
Edith Leal-Sánchez ◽  
Evelio Francisco ◽  
Jose A. Perez-Pimienta ◽  
Ángel Martín Pendás ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Real Space ◽  
Order Perturbation ◽  
Order Perturbation Theory ◽  
Energy Decomposition ◽  
Complete Active Space ◽  
Active Space ◽  
Decomposition Scheme ◽  
Interacting Quantum Atoms ◽  
Second Order Perturbation Theory

We present an implementation of the interacting quantum atoms energy decomposition scheme (IQA) with the complete active space second-order perturbation theory (CASPT2). This combination yields a real-space interpretation tool with...

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