scholarly journals Comparative Theoretical Study of Stability, Lypophilicity, Dipole Moments, Acidity and Spectroscopic Properties of Non-Steroidal Anti-Inflammatory Drugs: Ibuprofen, Ketoprofen and Flurbiprofen

2020 ◽  
pp. 51-60
Author(s):  
Assoma Amon Benjamine ◽  
Atse Adepo Jacques ◽  
Kone Soleymane ◽  
Bamba El Hadji Sawaliho
Keyword(s):  
Dft Calculations ◽  
Physicochemical Properties ◽  
Theoretical Study ◽  
Dipole Moments ◽  
Spectroscopic Properties ◽  
Dft Methods ◽  
Gibbs Energies ◽  
Td Dft ◽  
Inflammatory Drugs ◽  
Homo Lumo

A comparative theoretical study of some physicochemical properties of R and S enantiomers of ibuprofen, ketoprofen and flurbiprofen is undertaken in order to understand their reactivity. To do this, DFT and TD-DFT methods at the B3LYP/6-311G(d,p) level theory are used. The partition coefficient determined is 3.72 for ibuprofen, 2.81 for ketoprofen and 4.12. for flurbiprofen. That means that these NSAIDs are characterized by a high lipophilicity. The calculated Gibbs energies show that the R enantiomer is the most stable in the case of ibuprofen and the S enantiomer in the case of ketoprofen and flurbiprofen. The study of acidity shows that S enantiomer of ibuprofen and R enantiomers of ketoprofen and flurbiprofen are the most acidic enantiomers. TD-DFT calculations show that, the absorption maxima (λmax) of ibuprofen and flurbiprofen correspond to the HOMO→LUMO transition. For ketoprofen, these are associated with the transition HOMO→LUMO+1. These results elucidate the reactivity of the investigated NSAIDs and could help to establish a classification their efficacy.

A Theoretical Study of Substituted Stepwise Fluorinated Cyclopropanone Keto-Enol System

2003 ◽  
Vol 58 (12) ◽  
pp. 749-755
Author(s):  
Abdullah El-Alali ◽  
Ali A. Marashdeh ◽  
Salim M. Khalil
Keyword(s):  
Theoretical Study ◽  
Dipole Moments ◽  
Heats Of Formation ◽  
Geometrical Parameters ◽  
Free Energies ◽  
Isodesmic Reactions ◽  
Orbital Energies ◽  
Substantial Concentration ◽  
Homo Lumo ◽  
Complete Optimization

MINDO-Forces calculations have been performed with complete optimization of the geometries on stepwise fluorinated cyclopropanones and their enols. Increase in the number of fluorine atoms causes destabilization of cyclopropanone. Perfluorinated enol was found to be present in substantial concentration, as was mentioned in previous work. This is supported by calculations of Gibbs free energies and isodesmic reactions. Geometrical parameters, heats of formation, electron densities, dipole moments and orbital energies (HOMO-LUMO) are reported.

TD-DFT calculations of the excited states of metalloporphyrins relevant to organic solar photovoltaic cells

2014 ◽  
Vol 18 (06) ◽  
pp. 475-492 ◽  
Author(s):  
Neha Agnihotri ◽  
Ronald P. Steer
Keyword(s):  
Dft Calculations ◽  
Electronic State ◽  
Excited States ◽  
Photovoltaic Cells ◽  
Oscillator Strengths ◽  
Solar Photovoltaic ◽  
Dft Methods ◽  
Radiative Transitions ◽  
Td Dft ◽  
Triplet Excited States

The molecular orbital energies and symmetries, electronic state energies and symmetries, and orbital compositions and oscillator strengths for one-photon radiative transitions up to an energy of 4 eV have been calculated by DFT and TD-DFT methods for 15 d0 and d10 metalloporphyrins. Data for both singlet and triplet excited states are reported and used to identify potential candidates for use as photon upconverters by homomolecular triplet–triplet annihilation.

Theoretical Study of Octahedral Substitution Effect in Delaminated Pyrophyllite: Physicochemical Properties and Applications

2021 ◽  
Author(s):  
Carla Romina Luna ◽  
Walter Guillermo Reimers ◽  
Marcelo Avena ◽  
Alfredo Juan
Keyword(s):  
Dft Calculations ◽  
Physicochemical Properties ◽  
Electronic Properties ◽  
Theoretical Study ◽  
Substitution Effect ◽  
Isomorphic Substitution ◽  
Octahedral Sheet ◽  
Octahedral Substitution

We have studied, using DFT calculations, some geometrical and electronic properties of delaminated pyrophyllite (D-P) and the corresponding layers that resulted from three isomorphic substitution on the octahedral sheet (Mg2+,...

Dithienosilole extended BODIPYs: Synthesis and spectroscopic properties

2019 ◽  
Vol 23 (06) ◽  
pp. 664-670 ◽  
Author(s):  
Yijuan Sun ◽  
Lizhi Gai ◽  
Yitong Wang ◽  
Zhirong Qu ◽  
Hua Lu
Keyword(s):  
Absorption Coefficient ◽  
Dft Calculations ◽  
Knoevenagel Condensation ◽  
Spectroscopic Properties ◽  
Condensation Reactions ◽  
Spectral Bands ◽  
Spectral Shifts ◽  
Td Dft

3,/3,5-Dithienosilole-vinyl-BODIPYs were readily synthesized through Knoevenagel condensation reactions. Spectroscopic properties of two dyes in various solvents were investigated. Dyes 1 and 2 show an absorption maxima at 620 and 738 nm with absorption coefficient of 60900 and 77900 [Formula: see text] cm[Formula: see text] in DCM, respectively. Significant red shifts of the main spectral bands are observed relative to that of the parent 1,3,5,7-tetramethyl-BODIPY. TD-DFT calculations reproduce the spectral shifts and experimental spectra.

XAS of tetrakis(phenyl)- and tetrakis(pentafluorophenyl)-porphyrin: an experimental and theoretical study

2015 ◽  
Vol 17 (3) ◽  
pp. 2001-2011 ◽  
Author(s):  
Marco Vittorio Nardi ◽  
Roberto Verucchi ◽  
Luca Pasquali ◽  
Angelo Giglia ◽  
Giovanna Fronzoni ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Oscillator Strength ◽  
Theoretical Study ◽  
Excitation Energies ◽  
Porphyrin Macrocycle ◽  
Td Dft

NEXAFS outcomes and TD-DFT calculations pertaining to H2TPP and H2TPP(F) demonstrate the electronic inertness of b1u porphyrin macrocycle 1s → π* excitations. In fact, corresponding excitation energies, but not their oscillator strength values, are substantially unaffected upon fluorination of Ph rings.

DFT and TD-DFT Calculations on the Electronic Structures and Spectroscopic Properties of Cyclometalated Platinum(II) Complexes

2007 ◽  
Vol 111 (25) ◽  
pp. 5465-5472 ◽  
Author(s):  
Xin Zhou ◽  
Qing-Jiang Pan ◽  
Bao-Hui Xia ◽  
Ming-Xia Li ◽  
Hong-Xing Zhang ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Electronic Structures ◽  
Spectroscopic Properties ◽  
Td Dft

scholarly journals DFT and TD-DFT Study of Structure and Properties of Semiconductive Hybrid Networks Formed by Bismuth Halides and Different Polycyclic Aromatic Ligands

2011 ◽  
Vol 8 (s1) ◽  
pp. S195-S202
Author(s):  
Y. Belhocine ◽  
M. Bencharif
Keyword(s):  
Density Functional Theory ◽  
Band Gap ◽  
Density Functional ◽  
Relativistic Effects ◽  
Spectroscopic Properties ◽  
Basis Set ◽  
Dft Methods ◽  
Functional Theory ◽  
Td Dft ◽  
Polycyclic Aromatic

The structure and spectroscopic properties of polycyclic aromatic ligands of 2,3,6,7,10,11-hexakis (alkylthio) triphenylene (alkyl: methyl, ethyl, and isopropyl; corresponding to the abbreviations of the molecules: HMTT, HETT and HiPTT) were studied using density functional theory (DFT) and time dependent density functional theory (TD-DFT) methods with triple-zeta valence polarization (TZVP) basis set. It was shown that the type of functional theory used, Becke-Perdew (BP) and Leeuwen-Baerends (LB94) implemented in Amsterdam Density functional (ADF) program package, does not have essential influence on the geometry of studied compounds in both ground and excited states. However, significant differences were obtained for the band gap values with relativistic effects of the zero order regular approximation scalar corrections (ZORA) and LB94 functional seems to reproduce better the experimental optical band gap of these systems.

scholarly journals Synthesis, characterization, X-ray crystal structure and DFT calculations of 4-([2,2':6',2''-terpyridin]- 4'-yl)phenol

2018 ◽  
Vol 47 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Cesar Sierra ◽  
Brian Castro Agudelo ◽  
Cristian Ochoa-Puentes ◽  
William Rodriguez-Cordoba ◽  
Andreas Reiber
Keyword(s):  
Crystal Structure ◽  
Dft Calculations ◽  
X Ray ◽  
Td Dft ◽  
Homo Lumo

La síntesis de derivados terpiridinicos (Tpy) se ha investigado ampliamente debido a su potencial para la conversión de  energía solar. En este artículo se sintetizó  y caracterizó el 4-([2,2':6',2'' terpiridin]-4'-il)fenol (TpyOH), a través de varias metodologías como la cristalografía de rayos X y herramientas computacionales. El análisis de rayos X de monocristal mostró que el TpyOH es plano, con ángulos diedros de 5,03° entre el piridinilo central y el anillo fenólico, con presencia de ángulos de 6,05 y 12,2º en la porción terpiridínica. En el cristal, las moléculas están unidas por  enlaces  de  hidrógeno intermoleculares  y  mediante  interacciones  de apilamiento  π-π. Utilizando cálculos DFT dependientes del tiempo (TD-DFT) y teniendo en cuenta el efecto de los  disolventes, se investigaron y  compararon los  espectros  de absorción  y fluorescencia  de TpyOH. Las energías de transición TD-DFT de S0→Sn y S1→S0 concuerdan con los resultados experimentales. El análisis de orbitales moleculares de frontera mostró que la banda de absorción de baja energía corresponde a transferencia de carga intraligando (ICT); mientras que la banda de alta energía es común en las transiciones π-π* del resto Tpy. La emisión debido a la transición S1→S0 corresponde  a  ICT,  con  una  contribución  del 90%  proveniente  de  transiciones HOMO→LUMO.

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