Molecular force field for thionyl fluoride and sulphuryl fluoride

1967 ◽  
Vol 20 (6) ◽  
pp. 1055 ◽  
Author(s):  
R Pichai ◽  
MGK Pillai ◽  
K Ramaswamy
Keyword(s):  
Oxygen Atom ◽  
Potential Energy ◽  
Force Field ◽  
Spectral Data ◽  
Lone Pair ◽  
Molecular Force ◽  
Molecular Force Field ◽  
Energy Constants

The potential energy constants of thionyl fluoride and sulphuryl fluoride were calculated using a modified UBRF. The behaviour of the oxygen atom is found to be similar to that of the lone pair of electrons in thionyl fluoride. The vibrational mean amplitudes of thionyl fluoride and sulphuryl fluoride were also calculated from the vibrational spectral data.

Molecular force field for chlorine trifluoride

1965 ◽  
Vol 18 (3) ◽  
pp. 261 ◽  
Author(s):  
MG Krishna ◽  
K Ramaswamy ◽  
R Pichai
Keyword(s):  
Force Field ◽  
Force Constant ◽  
Lone Pair ◽  
Pair Interaction ◽  
Pair Bond ◽  
Approximate Relation ◽  
Lone Pairs ◽  
Bond Pair ◽  
Molecular Force ◽  
Molecular Force Field

An attempt has been made to modify the UBFF for chlorine trifluoride by taking into account the presence of lone pairs of electrons, on the lines suggested by Pariseau, Wu, and Overend. It was found that the lone-pair-bond-pair interaction is less than the lone-pair-lone-pair interaction which is considerably lower than the stretching force constant for the lone pair of electrons. An approximate relation between the above interactions was obtained.

Molecular force field for bromine pentafluoride

1968 ◽  
Vol 46 (14) ◽  
pp. 2393-2397 ◽  
Author(s):  
M. G. Krishna Pillai ◽  
P. Parameswaran Pillai
Keyword(s):  
Force Field ◽  
Lone Pair ◽  
Pair Interaction ◽  
Pair Bond ◽  
Halogen Atoms ◽  
Bond Pair ◽  
Molecular Force ◽  
Molecular Force Field ◽  
Lone Pair Electrons

An attempt has been made to study the influence of lone pair electrons on the potential constants of BrF5 with a modified Urey–Bradley force field. It is found that the lone pair – bond pair repulsion is greater than the bond pair – bond pair repulsion. It is also concluded from a study of other molecules containing halogen atoms that the ratio of lone pair – bond pair interaction to bond pair – bond pair interaction is very nearly 1.23.

Molecular force field evaluation by empirical constraints

1976 ◽  
Vol 73 ◽  
pp. 1051-1057
Author(s):  
Sadao Isotani ◽  
Alain J.-P. Alix
Keyword(s):  
Force Field ◽  
Field Evaluation ◽  
Molecular Force ◽  
Molecular Force Field

Molecular force field and structure of water: Recent microwave results

1974 ◽  
Vol 53 (1) ◽  
pp. 62-76 ◽  
Author(s):  
Robert L. Cook ◽  
Frank C. De Lucia ◽  
Paul Helminger
Keyword(s):  
Force Field ◽  
Structure Of Water ◽  
Molecular Force ◽  
Molecular Force Field

scholarly journals Pengaruh Minimisasi Energi MMFF94 dengan MarvinSketch dan Open Babel PyRx pada Penambatan Molekular Turunan Oksindola Tersubstitusi

ALCHEMY ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 33-40
Author(s):  
Atika Umi Hanif ◽  
Prima Agusti Lukis ◽  
Arif Fadlan
Keyword(s):  
Molecular Docking ◽  
Drug Discovery ◽  
Force Field ◽  
Binding Affinity ◽  
Energy Minimization ◽  
In Silico ◽  
Initial State ◽  
Molecular Force ◽  
Molecular Force Field ◽  
Docking Energy

 In silico technique is widely used for drug discovery because it can predict the conformation of ligands in protein macromolecules and it can calculate the binding affinity. The energy minimization is carried out to make the ligand more stable near the initial state during molecular docking process. The Merck Molecular Force Field (MMFF94) is one type of energy minimization process often used in organic compounds. The molecular docking of substituted oxindole derivatives on indoleamine macromolecules 2,3-dioxygenase (IDO-1, PDB: 2D0T) by MMFF94 minimization operated by MarvinSketch and Open Babel in PyRx showed different results. The binding affinity energy obtained was also quite different, but the ligands have the same conformation and bind the same residue with slightly different bond distances. Keywords: Molecular docking, energy minimization, substituted oxindole, Merck Molecular Force Field 94  Teknik in silico banyak digunakan untuk penemuan senyawa obat karena dapat memprediksi konformasi suatu ligan dalam makromolekul protein dan mampu menghitung nilai afinitas ikatan. Proses minimisasi energi dilakukan untuk menjadikan ligan lebih stabil mendekati keadaan awal selama penambatan molekular berlangsung. Merck Molecular Force Field (MMFF94) adalah salah satu jenis persamaan minimisasi energi yang sering digunakan pada senyawa organik. Hasil pengujian pengaruh minimisasi energi dengan MMFF94 menggunakan program MarvinSketch dan Open Babel dalam PyRx pada turunan oksindola tersubstitusi alkil terhadap makromolekul 2,3-dioxygenase indoleamine (IDO-1, PDB: 2D0T) menunjukkan hasil dengan nilai yang berbeda. Energi afinitas ikatan yang didapatkan juga cukup berbeda, namun ligan memiliki konformasi yang sama dan mengikat residu yang sama dengan jarak ikatan yang sedikit berbeda. Kata kunci: Penambatan molekular, minimisasi energi, oksindola tersubstitusi, Merck Molecular Force Field 94

Molecular Force Field of Methanol

1993 ◽  
Vol 26 (8) ◽  
pp. 1497-1510 ◽  
Author(s):  
Y. Hase ◽  
R. Forneris ◽  
S. C. da Silva
Keyword(s):  
Force Field ◽  
Molecular Force ◽  
Molecular Force Field

scholarly journals ESTUDO TEÓRICO DO ÁCIDO GIBERÉLICO: CARACTERIZAÇÃO CONFORMACIONAL, ELETRÔNICA E ADME

2019 ◽  
Vol 4 (2) ◽  
pp. 79
Author(s):  
Matheus Nunes da Rocha ◽  
Othon Souto Campos ◽  
Márcia Machado Marinho ◽  
Emmanuel Silva Marinho
Keyword(s):  
Force Field ◽  
In Silico ◽  
Log P ◽  
Molecular Force ◽  
Molecular Force Field

A indústria moderna utiliza-se dos produtos naturais para diversos fins, desde os alimentícios até os farmacêuticos. Muitas vezes a própria indústria é interessada na biossíntese de determinados compostos naturalmente disponíveis, sendo que certas propriedades físico-químicas não estão reportadas. Uma dessas biomoléculas é o ácido giberélico (GA3), que atua modificando a forma de vegetais e acelerando seu metabolismo, cuja biossíntese tem baixo rendimento. Nesse contexto, as técnicas computacionais auxiliam na predição de propriedades físico-químicas, dentre elas a técnica do campo de força clássico MMFF94 (do inglês Merck Molecular Force Field 94). Desse modo, o presente trabalho tem como objetivo realizar um estudo inicial de caracterização eletrônica e estrutural do GA3 através do método dos cálculos de campo de força clássico MMFF94. Os cálculos de química computacional realizados foram determinantes na obtenção das propriedades físico-químicas do GA3, além do cálculo do coeficiente de partição log P, cálculos esses essenciais para futuros testes de docking molecular ou dinâmica molecular. A otimização eletrônica e estrutural do GA3 atingiu o ponto de menor energia potencial mais estável de valor 100,087 kJ mol-1 através do algoritmo MMFF94. Deste modo, propõe-se uma metodologia de otimização molecular para futuras simulações in silico para docking molecular.

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