Ab Initio and Quantum Chemical Topology studies on the isomerization of HONO to HNO2. Effect of the basis set in QCT

2010 ◽  
Vol 31 (14) ◽  
pp. 2555-2567 ◽  
Author(s):  
Slawomir Berski ◽  
Zdzislaw Latajka ◽  
Agnieszka J. Gordon
Keyword(s):  
Ab Initio ◽  
Quantum Chemical ◽  
Basis Set ◽  
Chemical Topology ◽  
Quantum Chemical Topology

scholarly journals Revitalizing the Concept of Bond Order Through Delocalization Measures in Real Space

2018 ◽  
Author(s):  
Carlos Outeiral Rubiera ◽  
Mark Vincent ◽  
Ángel Martín Pendás ◽  
Paul L. A. Popelier
Keyword(s):  
Ab Initio ◽  
Quantum Chemical ◽  
Bond Order ◽  
Large Body ◽  
Real Space ◽  
Chemical Topology ◽  
Delocalization Index ◽  
Consistent Manner ◽  
Quantum Chemical Topology ◽  
Source Of Information

Ab initio quantum chemistry is an independent source of information supplying an ever widening group of experimental chemists. However, bridging the gap between these ab initio data and chemical insight remains a challenge. In particular, there is a need for a bond order index that characterizes novel bonding patterns in a reliable manner, while recovering the familiar effects occurring in well-known bonds. In this article, through a large body of calculations, we show how the delocalization index derived from Quantum Chemical Topology (QCT) serves as such a bond order. This index is defined in a parameter-free, intuitive and consistent manner, and with little qualitative dependency on the level of theory used. The delocalization index is also able to detect the subtler bonding effects that underpin most practical organic and inorganic chemistry. We explore and connect the properties of this index and open the door for its extensive usage in the understanding and discovery of novel chemistry.

scholarly journals Revitalizing the Concept of Bond Order Through Delocalization Measures in Real Space

2018 ◽  
Author(s):  
Carlos Outeiral Rubiera ◽  
Mark Vincent ◽  
Ángel Martín Pendás ◽  
Paul L. A. Popelier
Keyword(s):  
Ab Initio ◽  
Quantum Chemical ◽  
Bond Order ◽  
Large Body ◽  
Real Space ◽  
Chemical Topology ◽  
Delocalization Index ◽  
Consistent Manner ◽  
Quantum Chemical Topology ◽  
Source Of Information

Ab initio quantum chemistry is an independent source of information supplying an ever widening group of experimental chemists. However, bridging the gap between these ab initio data and chemical insight remains a challenge. In particular, there is a need for a bond order index that characterizes novel bonding patterns in a reliable manner, while recovering the familiar effects occurring in well-known bonds. In this article, through a large body of calculations, we show how the delocalization index derived from Quantum Chemical Topology (QCT) serves as such a bond order. This index is defined in a parameter-free, intuitive and consistent manner, and with little qualitative dependency on the level of theory used. The delocalization index is also able to detect the subtler bonding effects that underpin most practical organic and inorganic chemistry. We explore and connect the properties of this index and open the door for its extensive usage in the understanding and discovery of novel chemistry.

Perspectives for quantum chemical topology in crystallography

2013 ◽  
Vol 87 (4) ◽  
pp. 048106 ◽  
Author(s):  
A Martín Pendás ◽  
E Francisco ◽  
A Costales
Keyword(s):  
Quantum Chemical ◽  
Chemical Topology ◽  
Quantum Chemical Topology

Introducing topology to assess the synchronicity of organic reactions. Dual reactivity of oximes with alkenes as a case study

2017 ◽  
Vol 4 (8) ◽  
pp. 1541-1554 ◽  
Author(s):  
Pedro Merino ◽  
Maria A. Chiacchio ◽  
Laura Legnani ◽  
Ignacio Delso ◽  
Tomas Tejero
Keyword(s):  
Quantum Chemical ◽  
Organic Reactions ◽  
Dual Reactivity ◽  
Chemical Topology ◽  
Quantum Chemical Topology

Quantum chemical topology analyses provide a new way of understanding the synchronicity of organic reactions.

scholarly journals Geometric and energetic data from quantum chemical calculations of halobenzenes and xylenes

2020 ◽  
Author(s):  
Sopanant Datta ◽  
Taweetham Limpanuparb
Keyword(s):  
Ab Initio ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Software Package ◽  
Geometry Optimization ◽  
Theoretical Data ◽  
Basis Set ◽  
Chemical Calculation ◽  
Custom Made

<p>This article presents theoretical data on geometric and energetic features of halobenzenes and xylenes. Data were obtained from <i>ab initio</i> geometry optimization and frequency calculations at HF, B3LYP, MP2 and CCSD levels of theory on 6-311++G(d,p) basis set. In total, 1504 structures of halobenzenes, three structures of xylenes and one structure of benzene were generated and processed by custom-made codes in Mathematica. The quantum chemical calculation was completed in Q-Chem software package. Geometric and energetic data of the compounds are presented in this paper as supplementary tables. Raw output files as well as codes and scripts associated with production and extraction of data are also provided.</p>

scholarly journals Geometric and Energetic Data from Ab Initio Calculations of Haloethene, Haloimine, Halomethylphosphine, Haloiminophosphine, Halodiazene, Halodiphosphene and Halocyclopropane

2019 ◽  
Author(s):  
Kridtin Chinsukserm ◽  
Wanutcha Lorpaiboon ◽  
Peerayar Teeraniramitr ◽  
Taweetham Limpanuparb
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Quantum Chemical ◽  
Theoretical Data ◽  
Geometric Optimization ◽  
Basis Set ◽  
Halogenated Compounds ◽  
Wolfram Mathematica

<p>This article presents theoretical data on geometric and energetic features of halogenated compounds of cyclopropane (∆) and ethene (C=C), imine (C=N), methylphosphine (C=P), iminophosphine (N=P), diazene (N=N) and diphosphene (P=P). The data were obtained from <i>ab initio</i> geometric optimization and frequency calculations at HF, B3LYP, MP2 and CCSD levels of theory on 6-311++G(d,p) basis set. Input structures were generated by shell scripts and run by Q-Chem quantum chemical package. The output files were processed to extract geometric and energetic information by Wolfram Mathematica.</p>

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.

scholarly journals Synthesis of tetrazole fused azepanes and quantum chemical topology study on the mechanism of the intramolecular cycloaddition reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (79) ◽  
pp. 50367-50371 ◽  
Author(s):  
M. S. Pino-Gonzalez ◽  
A. Romero-Carrasco ◽  
S. Calvo-Losada ◽  
N. Oña-Bernal ◽  
J. J. Quirante ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
Concerted Mechanism ◽  
Intramolecular Cycloaddition ◽  
Chemical Topology ◽  
Quantum Chemical Topology

Syntheses of novel tetrazolo azepanes by intramolecular 1,3-dipolar cycloaddition are described. Cyclization mechanistic topology study showed a pseudo concerted mechanism.

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