A Deep Insight into the Details of the Interisomerization and Decomposition Mechanism of o-Quinolyl and o-Isoquinolyl Radicals. Quantum Chemical Calculations and Computer Modeling

2016 ◽  
Vol 120 (38) ◽  
pp. 7538-7547 ◽  
Author(s):  
Faina Dubnikova ◽  
Carmen Tamburu ◽  
Assa Lifshitz
Keyword(s):  
Computer Modeling ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Decomposition Mechanism ◽  
Deep Insight ◽  
Insight Into

A density functional theory insight into the structure and reactivity of diphenyltin(IV) derivative of glycylphenylalanine

2016 ◽  
Vol 39 (3-4) ◽  
Author(s):  
Sandeep Pokharia ◽  
Rachana Joshi ◽  
Mamta Pokharia ◽  
Swatantra Kumar Yadav ◽  
Hirdyesh Mishra
Keyword(s):  
Density Functional Theory ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Density Functional ◽  
Functional Theory ◽  
Insight Into

AbstractThe quantum-chemical calculations based on density functional theory (DFT) have been performed on the diphenyltin(IV) derivative of glycyl-phenylalanine (H

Crystal and electronic structure of the new ternary phosphide Ho5Pd19P12

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Olha Zhak ◽  
Oksana Karychort ◽  
Volodymyr Babizhetskyy ◽  
Chong Zheng
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Structure Property Relationships ◽  
Metallic Bonding ◽  
Crystal And Electronic Structure ◽  
Insight Into

Abstract The title compound was prepared from the pure elements by sintering. The crystal structure was investigated by means of powder X-ray diffraction data. Ho5Pd19P12 exhibits the hexagonal Ho5Ni19P12-type structure with space group P 6 ‾ 2 m $P‾{6}2m$ , a = 13.1342(2), c = 3.9839(1) Å, R I = 0.060, R p = 0.080. The crystal structure can be described as a combination of two types of the structural units, [HoPd6P3] and [Ho3Pd10P6], respectively, mutually displaced by 1/2 along the crystallographic c axis. Quantum chemical calculations have been performed to analyze the electronic structure and provide deeper insight into the structure-property relationships. The results of the quantum chemical calculations indicate that the material features metallic bonding between Ho and Pd and covalent bonding between Pd and P.

Ab initio conformational analysis of 1,2,3,4-tetrahydroquinoline and the high-resolution rotational spectrum of its lowest energy conformer

2018 ◽  
Vol 20 (21) ◽  
pp. 14664-14670 ◽  
Author(s):  
Kateřina Luková ◽  
Radim Nesvadba ◽  
Tereza Uhlíková ◽  
Daniel A. Obenchain ◽  
Dennis Wachsmuth ◽  
...  
Keyword(s):  
High Resolution ◽  
Conformational Analysis ◽  
Ab Initio ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Rotational Spectroscopy ◽  
Rotational Spectrum ◽  
Molecular Physics ◽  
Insight Into

The tight combination of rotational spectroscopy and quantum-chemical calculations provides an insight into the molecular physics of the lowest energy conformer of 1,2,3,4-tetrahydroquinoline.

scholarly journals Carborane-Based Carbonic Anhydrase Inhibitors: Insight into CAII/CAIX Specificity from a High-Resolution Crystal Structure, Modeling, and Quantum Chemical Calculations

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Pavel Mader ◽  
Adam Pecina ◽  
Petr Cígler ◽  
Martin Lepšík ◽  
Václav Šícha ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Carbonic Anhydrase ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Computational Analysis ◽  
Structure Modeling ◽  
Carbonic Anhydrases ◽  
Carbonic Anhydrase Inhibitors ◽  
Insight Into

Carborane-based compounds are promising lead structures for development of inhibitors of carbonic anhydrases (CAs). Here, we report structural and computational analysis applicable to structure-based design of carborane compounds with selectivity toward the cancer-specific CAIX isoenzyme. We determined the crystal structure of CAII in complex with 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane at 1.0 Å resolution and used this structure to model the 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane interactions with CAIX. A virtual glycine scan revealed the contributions of individual residues to the energy of binding of 1-methylenesulfamide-1,2-dicarba-closo-dodecaborane to CAII and CAIX, respectively.

Influence of Structural Organization On Optical and Transport Properties in Organic Materials

1999 ◽  
Vol 598 ◽  
Author(s):  
J. Cornil ◽  
J.Ph. Calbert ◽  
D. Beljonne ◽  
D.A. Dos Santos ◽  
J.L. Bredas
Keyword(s):  
Transport Properties ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Structural Organization ◽  
Conjugated Oligomers ◽  
Structure Property ◽  
Chain Packing ◽  
Crystalline Phases ◽  
Structure Property Relationships ◽  
Insight Into

ABSTRACTCorrelated quantum-chemical calculations performed on supermolecular structures, i.e., on clusters made of several oligomer chains in interaction, provide insight into structure-property relationships in well-organized molecular films. This supermolecular approach is applied to crystalline phases of two prototypical conjugated oligomers and shows that variations in chain packing can lead to dramatically different optical (Davydov) splittings and carrier mobilities. Optimal chain organizations for various types of devices are discussed.

scholarly journals Supramolecular insight into the substitution of sulfur by selenium, based on crystal structures, quantum-chemical calculations and biosystem recognition

2020 ◽  
Vol 76 (1) ◽  
pp. 122-136 ◽  
Author(s):  
Ivana S. Đorđević ◽  
Marko Popadić ◽  
Mirjana Sarvan ◽  
Marija Petković-Benazzouz ◽  
Goran V. Janjić
Keyword(s):  
Crystal Structures ◽  
Quantum Chemical Calculations ◽  
Binding Sites ◽  
Quantum Chemical ◽  
Electrostatic Interactions ◽  
Docking Studies ◽  
Amino Acid Residues ◽  
Structural Database ◽  
Insight Into ◽  
Influence Of Substituents

Statistical analysis of data from crystal structures extracted from the Cambridge Structural Database (CSD) has shown that S and Se atoms display a similar tendency towards specific types of interaction if they are part of a fragment that corresponds to the side chains of cysteine (Cys), methionine (Met) selenocysteine (Sec) and selenomethionine (Mse). The most numerous are structures with C—H...Se and C—H...S interactions (∼80%), notably less numerous are structures with Se...Se and S...S interactions (∼5%), and Se...π and S...π interactions are the least numerous. The results of quantum-chemical calculations have indicated that C—H...Se (∼−0.8 kcal mol−1) and C—H...S interactions are weaker than the most stable parallel interaction (∼−3.3 kcal mol−1) and electrostatic interactions of σ/π type (∼−2.6 kcal mol−1). Their significant presence can be explained by the abundance of CH groups compared with the numbers of Se and S atoms in the crystal structures, and also by the influence of substituents bonded to the Se or S atom that further reduce their possibilities for interacting with species from the environment. This can also offer an explanation as to why O—H...Se (∼−4.4 kcal mol−1) and N—H...Se interactions (∼−2.2 kcal mol−1) are less numerous. Docking studies revealed that S and Se rarely participate in interactions with the amino acid residues of target enzymes, mostly because those residues preferentially interact with the substituents bonded to Se and S. The differences between Se and S ligands in the number and positions of their binding sites are more pronounced if the substituents are polar and if there are more Se/S atoms in the ligand.

Molecular ruthenium water oxidation catalysts carrying non-innocent ligands: mechanistic insight through structure–activity relationships and quantum chemical calculations

2016 ◽  
Vol 6 (5) ◽  
pp. 1306-1319 ◽  
Author(s):  
Markus D. Kärkäs ◽  
Rong-Zhen Liao ◽  
Tanja M. Laine ◽  
Torbjörn Åkermark ◽  
Shams Ghanem ◽  
...  
Keyword(s):  
Quantum Chemical Calculations ◽  
Water Oxidation ◽  
Quantum Chemical ◽  
Oxidation Catalysis ◽  
Oxidation Catalysts ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Mechanistic Insight ◽  
Insight Into

Herein is highlighted how structure–activity relationships can be used to provide mechanistic insight into H2O oxidation catalysis.

scholarly journals Experimental and Computational Study on the Debenzylation of (2,4-dimethoxybenzyl)-protected 1,3-diazaoxindoles

2017 ◽  
Vol 61 (4) ◽  
pp. 264
Author(s):  
Eszter Kókai ◽  
Benjámin Kováts ◽  
Balázs Komjáti ◽  
Balázs Volk ◽  
József Nagy
Keyword(s):  
Reaction Mechanism ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Computational Study ◽  
Protecting Group ◽  
Electronic Effects ◽  
Triflic Acid ◽  
Drug Candidates ◽  
Insight Into

The introduction and removal of the 2,4-dimethoxybenzyl (DMB) moiety was studied in order to use it as a protecting group in the synthesis of diverse drug candidates containing the 1,3-diazaoxindole scaffold. The debenzylation of C(5)-unsubstituted and C(5)-isopropylidene-substituted 1,3-diazaoxindoles was investigated under various conditions. The DMB group could only be removed from the latter derivative using triflic acid. This observation can most likely be explained with electronic effects. In order to get a deeper insight into the reaction mechanism, quantum chemical calculations have been performed.

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