Dipolar Characteristics of the Imine-Group and its Hydrogen Bonds. A Quantum-Chemical and Experimental Approach

1991 ◽  
Vol 95 (1) ◽  
pp. 1-9
Author(s):  
D. Peeters ◽  
P. Huyskens ◽  
K. Nelis
Keyword(s):  
Hydrogen Bonds ◽  
Quantum Chemical ◽  
Experimental Approach ◽  
Imine Group

scholarly journals Crystal structure of 2-{[2-methoxy-5-(trifluoromethyl)phenyl]iminomethyl}-4-nitrophenol

2015 ◽  
Vol 71 (7) ◽  
pp. o466-o467 ◽  
Author(s):  
Nevzat Karadayı ◽  
Songül Şahin ◽  
Yavuz Köysal ◽  
Emine Coşkun ◽  
Orhan Büyükgüngör
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Helical Chain ◽  
Screw Axis ◽  
Imine Group ◽  
Compound C ◽  
Benzene Rings ◽  
Axis Parallel

In the title compound, C15H11F3N2O4, the N=C bond of the central imine group adopts anEconformation. The dihedral angle between two benzene rings is 6.2 (2)°. There is an intramolecular bifurcated O—H...(N,O) hydrogen bond withS(6) andS(9) ring motifs. In the crystal, molecules are linked by C—H...O hydrogen bonds into a helical chain along the 31screw axis parallel toc. The –CF3group shows rotational disorder over two sites, with occupancies of 0.39 (2) and 0.61 (2).

scholarly journals The nature of resonance-assisted hydrogen bonds: a quantum chemical topology perspective

2016 ◽  
Vol 18 (38) ◽  
pp. 26383-26390 ◽  
Author(s):  
José Manuel Guevara-Vela ◽  
Eduardo Romero-Montalvo ◽  
Aurora Costales ◽  
Ángel Martín Pendás ◽  
Tomás Rocha-Rinza
Keyword(s):  
Charge Transfer ◽  
Hydrogen Bonds ◽  
Quantum Chemical ◽  
Electron Localization ◽  
Chemical Topology ◽  
Quantum Chemical Topology ◽  
New Interpretation

We give a new interpretation of Resonance Assisted Hydrogen Bonds (RAHBs) in which RAHB formation leads to an overall electron localization excluding covalency as the main source of stabilization. The most relevant contributions to the RAHB energetics are electrostatics, polarization and charge transfer.

Conformational analyses for hydrated oligopeptides by quantum chemical calculation (QCC): effects of intra-molecular hydrogen bonds

2018 ◽  
Vol 76 (7) ◽  
pp. 3247-3268
Author(s):  
Minoru Kobayashi ◽  
Jae Ho Sim ◽  
Hisaya Sato
Keyword(s):  
Hydrogen Bonds ◽  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Molecular Hydrogen ◽  
Chemical Calculation

Binding of metal ions and water molecules to nucleic acid bases: the influence of water molecule coordination to a metal ion on water–nucleic acid base hydrogen bonds

2019 ◽  
Vol 75 (3) ◽  
pp. 301-309
Author(s):  
Jelena M. Andrić ◽  
Ivana M. Stanković ◽  
Snežana D. Zarić
Keyword(s):  
Nucleic Acid ◽  
Hydrogen Bonds ◽  
Nucleic Acids ◽  
Metal Ions ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Metal Ion ◽  
Water Molecules ◽  
Nucleic Acid Bases ◽  
Coordinated Water

The interactions of nucleic acid bases with non-coordinated and coordinated water molecules were studied by analyzing data in the Protein Data Bank (PDB) and by quantum chemical calculations. The analysis of the data in the crystal structures from the PDB indicates that hydrogen bonds involving oxygen or nitrogen atoms of nucleic acid bases and water molecules are shorter when water is bonded to a metal ion. These results are in agreement with the quantum chemical calculations on geometries and interaction energies of hydrogen bonds; the calculations on model systems show that hydrogen bonds of nucleic acid bases with water bonded to a metal ion are stronger than hydrogen bonds with non-coordinated water. These calculated values are similar to the strength of hydrogen bonds between nucleic acid bases. The results presented in this paper may be relevant to understand the role of water molecules and metal ions in the process of replication and stabilization of nucleic acids and also to understand the possible toxicity of metal ion interactions with nucleic acids.

A quantum chemical study of the effect of Na+ on the hydrogen bonds in the adenine-thymine base-pair

1984 ◽  
Vol 19 (3) ◽  
pp. 201-209 ◽  
Author(s):  
Pavel Hobza ◽  
Camille Sandorfy
Keyword(s):  
Hydrogen Bonds ◽  
Base Pair ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Adenine Thymine
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