scholarly journals Some Curcumin Isomers and Their Enol Tautomers - A DFT Treatment

2020 ◽  
pp. 183-197
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Natural Product ◽  
Spectral Data ◽  
Quantum Chemical ◽  
Density Functional ◽  
Health Benefits ◽  
Functional Theory

Curcumin is a well known natural product having some health benefits. In the present study, within the constraints of density functional theory (at the level of B3LYP/6-31G(d,p)), some configurational isomers of curcumin and their keto-enol tautomers have been investigated. Some quantum chemical, QSAR and spectral data of them have been obtained and discussed.

scholarly journals A Quire Polycyclic Structure of N8 - A DFT Treatise

2021 ◽  
pp. 1-14
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Spectral Data ◽  
Quantum Chemical ◽  
Density Functional ◽  
Functional Theory ◽  
Methods Of Calculations

The present study considers a quire polycyclic structure of N8 and biradicals constructed from it which keep molecular integrity within the limitations of density functional theory at the levels of UB3LYP/6-311++G(2df,2p) and UB3LYP/cc-PVTZ. Certain structural, energetic, quantum chemical and spectral data have been obtained for them and discussed. The both methods of calculations generally produce parallel results.

scholarly journals Comparative Approach to Interaction of Zinc Dication with Theobromine and Theophilline-A DFT Treatment

2021 ◽  
pp. 295-306
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Spectral Data ◽  
Quantum Chemical ◽  
Density Functional ◽  
Comparative Approach ◽  
Chemical Thermodynamic ◽  
Functional Theory ◽  
Analogous System

Two isomeric methylxanthines, theobromine and theophilline, and their Zn+2 containing composites are considered within the restrictions of density functional theory (B3LYP/ 6-31++G(d,p)). Certain quantum chemical, thermodynamic and spectral data have been harvested, compared and interpreted. The results revealed that theophilline+Zn+2 system is thermodynamically more exothermic, more favorable and electronically stable compared to the analogous system, theobromine+Zn+2.

scholarly journals Some DADNE Originated Cyclic Isomers - A DFT Study

2020 ◽  
pp. 137-153
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Spectral Data ◽  
Quantum Chemical ◽  
Density Functional ◽  
Dft Study ◽  
Functional Theory ◽  
Type Molecule ◽  
Cis And Trans ◽  
Ionic Forms

Diaminodinitroethylene (DADNE) has three constitutional isomers, geminal, cis and trans. The geminal one is the well known FOX-7 explosive. It is a push-pull type molecule. In the present study, within the restrictions of density functional theory at the level of B3LYP/6-311++G(d,p), two cyclic dimeric structures of DADNE are investigated quantum chemically. Also their mono ionic forms have been investigated (unrestricted treatment). All the structures are found to be stable. Various quantum chemical and spectral data are collected computationally and discussed.

scholarly journals Effect of Titanium on FOX-7 - A DFT Treatment

2020 ◽  
pp. 19-34
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Spectral Data ◽  
Quantum Chemical ◽  
Density Functional ◽  
Titanium Atom ◽  
High Energy ◽  
Functional Theory ◽  
Electron Population ◽  
Energy Material ◽  
High Energy Material

FOX-7 is a push-pull type conjugated system which attracts attention as an insensitive high energy material. The present study considers its titanium composite within the restrictions of density functional theory at the levels of B3LYP/LANL2DZ and B3LYP/6-311++G(2df,2p). The results indicate that the titanium atom transfers some electron population to the organic component, thus forces one of the N-O bonds to rupture. Various structural, quantum chemical and UV-VIS spectral data are collected and discussed.

scholarly journals Tautomerism in Fuscin - A DFT Treatment

2020 ◽  
pp. 243-259
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Natural Product ◽  
Quantum Chemical ◽  
Spectral Properties ◽  
Density Functional ◽  
Functional Theory ◽  
Valence Tautomerism ◽  
Valence Tautomer ◽  
Benzenoid Ring ◽  
Stable Structures

Fuscin, a natural product having various functionalities, may exhibit 1,3- and 1,5-proton tautomerism, as well as valence tautomerism via its 1,5-proton tautomer. All those possible forms are investigated within the realm of density functional theory with the constraints of B3LYP/6-311+G(d,p) level. NICS(0) calculation has been performed for the valence tautomer which possesses a benzenoid ring. The tautomers are found to be stable structures but the valence tautomer is the least likely one. Some QSAR, quantum chemical and spectral properties are obtained and discussed.

scholarly journals Tautomerism in Flindersine - A DFT Treatment

2020 ◽  
pp. 89-104
Author(s):  
Lemi Türker
Keyword(s):  
Density Functional Theory ◽  
Transition State ◽  
Natural Product ◽  
Quantum Chemical ◽  
Density Functional ◽  
Functional Theory ◽  
Valence Tautomerism ◽  
Plant Kingdom

Flindersine is a natural product of plant kingdom. Its structure contains a lactam group which could undergo 1,3-type proton tautomerism. It also has an embedded pyran moiety which might show valence tautomerism. Presently, those tautomers are investigated within the restrictions of density functional theory at the level of B3LYP/6-311++G(d,p). Certain quantum chemical output has been collected compared and discussed. Also the possibility of valence tautomerism has been searched by proposing two transition state paths.

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

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