An interaction potential between an alanine zwitterion and a water molecule based on ab initio calculations

1988 ◽  
Vol 34 (6) ◽  
pp. 527-533 ◽  
Author(s):  
Xiangshan Ni ◽  
Xiufan Shi ◽  
Lunjiang Ling
Keyword(s):  
Water Molecule ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Interaction Potential

Benzene—O2 interaction potential from ab initio calculations

1993 ◽  
Vol 205 (2-3) ◽  
pp. 331-336 ◽  
Author(s):  
Giovanni Granucci ◽  
Maurizio Persico
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Interaction Potential

Evidence For a Water-Stabilised Ion Radical Complex: Photoelectron Spectroscopy and Ab Initio Calculations

2020 ◽  
Vol 73 (8) ◽  
pp. 693
Author(s):  
Timothy R. Corkish ◽  
Christian T. Haakansson ◽  
Allan J. McKinley ◽  
Duncan A. Wild
Keyword(s):  
Water Molecule ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Unpaired Electron ◽  
Photoelectron Spectroscopy ◽  
Radical Anion ◽  
Photoelectron Spectrum ◽  
The Other ◽  
Spin Orbit ◽  
Anion Complex

A photoelectron spectrum corresponding to an unknown 174m/z anion complex has been recorded. Initially believed to be I−…CH3CH2OH (173m/z), the spectrum has been assigned as belonging to that of an I−…H2O…CH3CH2 radical anion complex. The major peaks in the photoelectron spectrum occur at 3.54eV and 4.48eV as the 2P3/2 and 2P1/2 spin-orbit states of iodine respectively. Ab initio calculations were performed in order to rationalise the existence of the complex, with all structures converging to a ‘ring-like’ geometry, with the iodide anion bound to both the water molecule as well as a hydrogen of the ethyl radical, with the other hydrogen of water bound to the unpaired electron site of the ethyl. Simulated vertical detachment energies of 3.59eV and 4.53eV were found to be in agreement with the experimental results.

scholarly journals SPECTROSCOPY STUDY OF MCl2(H2O)n CLUSTER USING AB INITIO CALCULATIONS

2020 ◽  
Vol 17 (36) ◽  
pp. 584-597
Author(s):  
Ahmed M SADOON ◽  
Omar SHEEJ AHMAD
Keyword(s):  
Water Molecule ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Minimum Energy ◽  
Solvent Molecule ◽  
Chloride Ion ◽  
Ion Pair ◽  
Basis Sets ◽  
Chemical Structures ◽  
Ion Size

The Infrared (IR) spectroscopy of alkali earth halide salt (MX2) complexes with few numbers of water molecules have been investigated for the first time in this work. BeCl2 and MgCl2 are divalent salts and have been incorporated with water as a polar solvent to form complexes of type MX2(H2O)n. The effect of ion size plays a critical rule in the interactions between solvent and solute. Therefore, Beryllium and Magnesium salts with chloride were chosen to explore this difference. The importance of BeCl2 and MgCl2 comes from their several applications in the industry and pharmacy. For instance, BeCl2 is widely used in the industry as a catalysis of Friede-Craft reactions, while the main application of MgCl2 in pharmacy is as hemodialysis and peritoneal dialysis fluids. Three complexes of each BeCl2 and MgCl2 with water, MX2(H2O)n (n=1-3), were studied, and the chemical structures of these complexes have been performed using ab initio calculations. Ab initio calculations were used to predict possible structures, isomers, and their corresponding IR spectra using Second-order Møller-Plesset perturbation theory (MP2) with 6-311++G as a basis sets. The Geometry evaluations, energy searches, vibrational frequency calculations, and the binding energy of each complex were also extracted theoretically. The minimum energy of complexes structures was calculated, and different isomers have been recorded. Ionic hydrogen bonds (IHBs) between the OH in each water molecule and the chloride ion in the MCl2 was proposed to be the main prevalent contribution to the binding between the salt and water. The bond length between the alkaline metal and chlorine showed a significant increase with increasing the attached water molecule as a result of forming the IHB. Also, the infrared vibrational bands of the OH stretching region were recorded for the minimum structures, and dramatic redshift was performed. The formation of contact-ion pair structures in which each solvent molecule forms an ionic hydrogen bond (IHB) to the salt ion-pair (X-M+X-) has been confirmed by the predicted infrared spectra.

Atomistic model derived from ab initio calculations tested in Benzene–Benzene interaction potential

2020 ◽  
Vol 537 ◽  
pp. 122679
Author(s):  
Elizane Efigenia de Moraes ◽  
Mariana Zancan Tonel ◽  
Solange Binotto Fagan ◽  
Marcia C. Barbosa
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Interaction Potential ◽  
Atomistic Model

Millimetre-wave and infrared spectroscopy of Br13 CN: anharmonic force field of cyanogen bromide from spectroscopic data and ab initio calculations

1997 ◽  
Vol 90 (3) ◽  
pp. 495-497
Author(s):  
CLAUDIO ESPOSTI ◽  
FILIPPO TAMASSIA ◽  
CRISTINA PUZZARINI ◽  
RICCARDO TARRONI ◽  
ZDENEK ZELINGER
Keyword(s):  
Infrared Spectroscopy ◽  
Force Field ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Spectroscopic Data ◽  
Cyanogen Bromide ◽  
Millimetre Wave ◽  
Anharmonic Force
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