scholarly journals Can ion mobility mass spectrometry and density functional theory help elucidate protonation sites in 'small' molecules?

2013 ◽  
Vol 27 (21) ◽  
pp. 2399-2410 ◽  
Author(s):  
Cris Lapthorn ◽  
Trevor J. Dines ◽  
Babur Z. Chowdhry ◽  
George L. Perkins ◽  
Frank S. Pullen
Keyword(s):  
Mass Spectrometry ◽  
Density Functional Theory ◽  
Small Molecules ◽  
Ion Mobility ◽  
Density Functional ◽  
Ion Mobility Mass Spectrometry ◽  
Functional Theory

Density functional theory for the selective adsorption of small molecules on a surface modified with polymer brushes

2012 ◽  
Vol 38 (4) ◽  
pp. 274-283 ◽  
Author(s):  
Yuli Xu ◽  
Xueqian Chen ◽  
Houyang Chen ◽  
Shouhong Xu ◽  
Honglai Liu ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Small Molecules ◽  
Polymer Brushes ◽  
Density Functional ◽  
Selective Adsorption ◽  
Functional Theory ◽  
Surface Modified

Synthesis of urease inhibitory 2, 4-bis (4-cyanobenzyl)glycoluril using sandmeyer reaction and density functional theory investigation

2021 ◽  
Vol 18 ◽  
Author(s):  
Mirza Arfan Yawer ◽  
Shehar Bano ◽  
Muhammad Saleem ◽  
Affiefa Yawer ◽  
Riaz Hussain ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Density Functional Theory ◽  
1H Nmr ◽  
13C Nmr ◽  
Density Functional ◽  
Spectroscopic Techniques ◽  
Pure Compound ◽  
Functional Theory ◽  
Sandmeyer Reaction ◽  
Urease Enzyme

Aims: The aim of present research was to synthesize glycoluril derivative 2,4-Bis(4-cyanobenzyl)glycoluril through convergent scheme. Background: For this purpose Sandmeyer reaction procedure was employed for the synthesis of said compound. The structure of the pure compound was confirmed by using different spectroscopic techniques such as 1H-NMR, 13C-NMR and (HR-MS) Mass spectrometry. Objective: Convergent synthesis of 2,4-BIS (4-CYANOBENZYL)GLYCOLURIL USING SANDMEYER REACTION and urease inhibition study. Methods: The structure of the pure compound was confirmed by using different spectroscopic techniques such as 1H-NMR, 13C-NMR and (HR-MS) Mass spectrometry. The electronic properties of newly synthesized compound and thiourea were determined by using density functional theory. Results: Furthermore compound was evaluated against urease enzyme and was found to be potent inhibitors with IC50 value of 11.5 ± 1.50 µM when compared with standard inhibitor thiourea (IC50 = 21.0 ± 1.90 µM). Compound may serve as lead compound for the synthesis of new cyano based bambusuril in future with enhanced biological properties. Conclusion: We have synthesized a new glycoluril derivative 2,4-Bis(4-cyanobenzyl)glycoluril by the sandmeyer reaction. It has obtained in the form of light yellowish powder in good yield (96%). Glycoluril based macrocycles have been used in various fields. Starting from the 2,4-Bis(4-nitrobenzyl)glycoluril (already reported compound) which has undergone reduction (CH3OH,Pt/C) , diazotization (NaNO2/HCl), cyanation (CuCl/KCN) respectively in order to synthesize the desired new glycoluril derivative. The obtained product will be used as a building block for the synthesis of the cyano based bambusuril marcocycle in future. The yield of the obtained product has been monitored by using different amount of cyanating reagent but the best results shown by the use of 4 mmol of CuCl/KCN. KCN with CuCl assisted the conversion of diazo group into cyano group with enhanced yield when used in excess amount. It act as a catalyst. Solubility characteristic of 2,4-Bis(4-cyanobenzyl)glycoluril has determined also in different organic solvents. 1H NMR technique proved to be very helpful for the structure determination of our desired product. Benzylic protons give signals at 7.5 ppm and 7.8 ppm respectively. The downfield peaks confirm about the presence of CN group near the benzylic protons. Methine protons show signal at 5.2 ppm which ensures about the basic skeleton of glycoluril. Ureidyl protons also confirm the synthesis of the heterocyclic 2,4-Bis(4-cyanobenzyl)glycoluril compound. The negative and positive electrostatic potential sites, molecular descriptors, and charge density distribution of frontier molecular orbitals are revealing that 4a with promising sites for electrophilic and nucleophilic attacks would result to enhance the urease inhbition which is in good agreement with the experimental data.

Synthesis, spectrophotometric, voltammetric, and density functional theory studies of tetrahydro[3,2‐ b ]indolocarbazoles for sensing small molecules

2020 ◽  
Vol 58 (1) ◽  
pp. 127-136
Author(s):  
Zehbah Ali Al‐Ahmed ◽  
Ibrahim H. I. Habib ◽  
Reham R. Khattab ◽  
Reda M. Abdelhameed ◽  
Mohamed El‐Naggar ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Small Molecules ◽  
Density Functional ◽  
Functional Theory

Probing the potential of metalla-N-heterocyclic carbenes towards activation of enthalpically strong bonds

2020 ◽  
Vol 49 (27) ◽  
pp. 9505-9515
Author(s):  
Bijoy Ghosh ◽  
Ashwini K. Phukan
Keyword(s):  
Density Functional Theory ◽  
Small Molecules ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Heterocyclic Carbenes ◽  
Functional Theory

Density functional theory calculations predict that metalla-N-heterocyclic carbenes are ideal candidates for the activation of a range of small molecules.

scholarly journals Investigation of the position of the radical in z3-ions resulting from electron transfer dissociation using infrared ion spectroscopy

2019 ◽  
Vol 217 ◽  
pp. 434-452 ◽  
Author(s):  
Lisanne J. M. Kempkes ◽  
Jonathan Martens ◽  
Giel Berden ◽  
Kas J. Houthuijs ◽  
Jos Oomens
Keyword(s):  
Mass Spectrometry ◽  
Density Functional Theory ◽  
Electron Transfer ◽  
Density Functional ◽  
Electron Transfer Dissociation ◽  
Open Shell ◽  
Molecular Structures ◽  
Functional Theory ◽  
Ion Spectroscopy ◽  
Molecular Dynamics Calculations

The molecular structures of six open-shell z3-ions resulting from electron transfer dissociation mass spectrometry (ETD MS) were investigated using infrared ion spectroscopy in combination with density functional theory and molecular mechanics/molecular dynamics calculations.

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