Probing the electronic structure, magnetotropicity, and absorption spectra of benzene trapped by lanthanide monoxides, C6 H6 ···LnO, using DFT methods

2012 ◽  
Vol 113 (5) ◽  
pp. 694-708
Author(s):  
Athanassios Tsipis ◽  
Dimitrios Gkarmpounis
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
Dft Methods ◽  
Lanthanide Monoxides

Effect of DFT methods on electronic structure and K-absorption spectra of InPS4: detailed studies of the optical, thermoelectric and elastic properties

2019 ◽  
Vol 6 (10) ◽  
pp. 106320 ◽  
Author(s):  
Tuan V Vu ◽  
A A Lavrentyev ◽  
B V Gabrelian ◽  
K F Kalmykova ◽  
Dat D Vo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
Elastic Properties ◽  
Dft Methods

Electronic Structure and X-ray Absorption Spectra of Rutile TiO2 Using First-Principles Calculations

2014 ◽  
Vol 52 (12) ◽  
pp. 1025-1029
Author(s):  
Min-Wook Oh ◽  
Tae-Gu Kang ◽  
Byungki Ryu ◽  
Ji Eun Lee ◽  
Sung-Jae Joo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
First Principles ◽  
First Principles Calculations ◽  
Rutile Tio2 ◽  
X Ray ◽  
X Ray Absorption

Performance of Electronic Structure Methods for the Description of Hückel-Möbius Interconversions in Extended π-Systems

2019 ◽  
Author(s):  
Tatiana Woller ◽  
Ambar Banerjee ◽  
Nitai Sylvetsky ◽  
Xavier Deraet ◽  
Frank De Proft ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Basis Set ◽  
Dft Methods ◽  
Molecular Switching ◽  
Wide Range ◽  
Electronic Structure Methods ◽  
Explicitly Correlated ◽  
Relative Errors ◽  
The Stability ◽  
Basis Set Expansion

<p>Expanded porphyrins provide a versatile route to molecular switching devices due to their ability to shift between several π-conjugation topologies encoding distinct properties. Taking into account its size and huge conformational flexibility, DFT remains the workhorse for modeling such extended macrocycles. Nevertheless, the stability of Hückel and Möbius conformers depends on a complex interplay of different factors, such as hydrogen bonding, p···p stacking, steric effects, ring strain and electron delocalization. As a consequence, the selection of an exchange-correlation functional for describing the energy profile of topological switches is very difficult. For these reasons, we have examined the performance of a variety of wavefunction methods and density functionals for describing the thermochemistry and kinetics of topology interconversions across a wide range of macrocycles. Especially for hexa- and heptaphyrins, the Möbius structures have a pronouncedly stronger degree of static correlation than the Hückel and figure-eight structures, and as a result the relative energies of singly-twisted structures are a challenging test for electronic structure methods. Comparison of limited orbital space full CI calculations with CCSD(T) calculations within the same active spaces shows that post-CCSD(T) correlation contributions to relative energies are very minor. At the same time, relative energies are weakly sensitive to further basis set expansion, as proven by the minor energy differences between MP2/cc-pVDZ and explicitly correlated MP2-F12/cc-pVDZ-F12 calculations. Hence, our CCSD(T) reference values are reasonably well-converged in both 1-particle and n-particle spaces. While conventional MP2 and MP3 yield very poor results, SCS-MP2 and particularly SOS-MP2 and SCS-MP3 agree to better than 1 kcal mol<sup>-1</sup> with the CCSD(T) relative energies. Regarding DFT methods, only M06-2X provides relative errors close to chemical accuracy with a RMSD of 1.2 kcal mol<sup>-1</sup>. While the original DSD-PBEP86 double hybrid performs fairly poorly for these extended p-systems, the errors drop down to 2 kcal mol<sup>-1</sup> for the revised revDSD-PBEP86-NL, again showing that same-spin MP2-like correlation has a detrimental impact on performance like the SOS-MP2 results. </p>

DFT Investigation of Substitution Effects on the Electronic Properties of Perylene Bisimides Derivatives

2014 ◽  
Vol 513-517 ◽  
pp. 347-350
Author(s):  
Bo Wei Chen ◽  
Ye Wei Xu ◽  
Lin Zhang
Keyword(s):  
Electronic Structure ◽  
Electronic Properties ◽  
Absorption Spectra ◽  
Electronic Structures ◽  
Semiconductor Materials ◽  
Substitution Effects ◽  
Density Functions ◽  
Computational Results ◽  
Good Accordance ◽  
Perylene Bisimides

Perylene Bisimides Derivatives (PBIs) are typical semiconductor materials. The electronic structures of PBIs were successfully investigated by density functions theory (DFT). The computational results were in the good accordance with the experimental UV-vis spectra. Additionally, the electronic structure and the variational UV-vis absorption spectra of PBIs were explained.

Electronic structure of C60F36 studied by quantum-chemical modeling of experimental photoemission and x-ray absorption spectra

2009 ◽  
Vol 130 (1) ◽  
pp. 014704 ◽  
Author(s):  
L. G. Bulusheva ◽  
A. V. Okotrub ◽  
V. V. Shnitov ◽  
V. V. Bryzgalov ◽  
O. V. Boltalina ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
Quantum Chemical ◽  
Quantum Chemical Modeling ◽  
Chemical Modeling ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Fingerprinting Electronic Structure of Heme Iron by Ab Initio Modeling of Metal L-Edge X-ray Absorption Spectra

2018 ◽  
Vol 15 (1) ◽  
pp. 477-489 ◽  
Author(s):  
Meiyuan Guo ◽  
Erik Källman ◽  
Rahul V. Pinjari ◽  
Rafael C. Couto ◽  
Lasse Kragh Sørensen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Ab Initio ◽  
Absorption Spectra ◽  
Heme Iron ◽  
X Ray ◽  
Ab Initio Modeling ◽  
X Ray Absorption

Electronic structure and MnK absorption spectra of MnO clusters in nanocomposites

2008 ◽  
Vol 49 (S1) ◽  
pp. 47-53
Author(s):  
V. V. Ilyasov ◽  
D. A. Velikohatskii ◽  
I. Ya. Nikiforov
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra
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