scholarly journals Synthesis, structural analysis, electrochemical and magnetic properties of tetrachloroferrate(III) ionic liquids

2021 ◽  
Author(s):  
Anham Zafar ◽  
Imtiaz-ud-Din Imtiaz-ud-Din ◽  
Safeer Ahmed ◽  
Dejan-Kresimir Bucar ◽  
Muhammad Nawaz Tahir ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ionic Liquids ◽  
Structural Analysis ◽  
General Formula ◽  
Spectroscopic Techniques ◽  
Esi Ms ◽  
Ft Ir ◽  
Electrochemical And Magnetic Properties

Eight ionic liquids have been synthesized with the tetrachloroferrate anion and varying cations having general formula [RA]+[FeCl4]−. They were characterized using spectroscopic techniques such as FT-IR, NMR, ESI-MS, Raman, and...

scholarly journals Synthesis and spectral properties of novel thiadiazolotriazinone derivatives

2012 ◽  
Vol 77 (7) ◽  
pp. 867-871 ◽  
Author(s):  
Demet Gürbüz ◽  
Süleyman Tanyolaç
Keyword(s):  
Carboxylic Acids ◽  
Analytical Methods ◽  
Spectral Properties ◽  
Phosphorus Oxychloride ◽  
Spectroscopic Techniques ◽  
Aromatic Carboxylic Acids ◽  
Esi Ms ◽  
Ft Ir

A series of new 7-substitued-4H-1,3,4-thiadiazolo[2,3-c][1,2,4]- triazin-4-oneswere synthesized in good yields by the reaction of 4-amino-3- mercapto-1,2,4-triazin-5(4H)-one with various aromatic carboxylic acids in the presence of phosphorus oxychloride. All the synthesized compounds were confirmed by FT-IR, NMR (1H and 13C), ESI-MS spectroscopic techniques and analytical methods.

scholarly journals A highly sensitive octopus-like azobenzene fluorescent probe for determination of abamectin B1 in apples

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhenlong Guo ◽  
YiFei Su ◽  
Kexin Li ◽  
MengYi Tang ◽  
Qiang Li ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Quantitative Detection ◽  
Fluorescence Signal ◽  
Ionization Mass ◽  
Limit Of Quantification ◽  
Visible Absorption ◽  
Esi Ms ◽  
Relative Standard ◽  
Ft Ir

AbstractThe development of detecting residual level of abamectin B1 in apples is of great importance to public health. Herein, we synthesized a octopus-like azobenzene fluorescent probe 1,3,5-tris (5′-[(E)-(p-phenoxyazo) diazenyl)] benzene-1,3-dicarboxylic acid) benzene (TPB) for preliminary detection of abamectin B1 in apples. The TPB molecule has been characterized by ultraviolet–visible absorption spectrometry, 1H-nuclear magnetic resonance, fourier-transform infrared (FT-IR), electrospray ionization mass spectroscopy (ESI-MS) and fluorescent spectra. A proper determination condition was optimized, with limit of detection and limit of quantification of 1.3 µg L−1 and 4.4 μg L−1, respectively. The mechanism of this probe to identify abamectin B1 was illustrated in terms of undergoing aromatic nucleophilic substitution, by comparing fluorescence changes, FT-IR and ESI-MS. Furthermore, a facile quantitative detection of the residual abamectin B1 in apples was achieved. Good reproducibility was present based on relative standard deviation of 2.2%. Six carboxyl recognition sites, three azo groups and unique fluorescence signal towards abamectin B1 of this fluorescent probe demonstrated reasonable sensitivity, specificity and selectivity. The results indicate that the octopus-like azobenzene fluorescent probe can be expected to be reliable for evaluating abamectin B1 in agricultural foods.

NMR, FT-IR, ESI MS and PM5 semiempirical study of new lasalocid 5-hydroxy-3-oxapentyl ester and its complexes with monovalent cations

2005 ◽  
Vol 733 (1-3) ◽  
pp. 155-165 ◽  
Author(s):  
Radosław Pankiewicz ◽  
Grzegorz Schroeder ◽  
Bogumił Brzezinski
Keyword(s):  
Monovalent Cations ◽  
Esi Ms ◽  
Ft Ir

scholarly journals Electrochemical and magnetic properties of nanostructured CoMn2O4 and Co2MnO4

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84988-84998 ◽  
Author(s):  
Neha Garg ◽  
Monu Mishra ◽  
Govind Govind ◽  
Ashok Kumar Ganguli
Keyword(s):  
Magnetic Properties ◽  
Spinel Phases ◽  
Electrochemical And Magnetic Properties

Phase dependent electrocatalysis of the two spinel phases (CoMn2O4 and Co2MnO4 nanocubes) towards OER and ORR.

Liquid Crystalline Properties of 4,4and#39;-methylenebis(N-(4-Alkanoxybenzylidene)aniline): Synthesis, Characterization, and Theoretical study

2019 ◽  
Vol 41 (6) ◽  
pp. 1107-1107
Author(s):  
Mohammed Taha Yaseen and Abdullah Hussein Kshash Mohammed Taha Yaseen and Abdullah Hussein Kshash
Keyword(s):  
Liquid Crystalline ◽  
Theoretical Study ◽  
Basis Set ◽  
Spectroscopic Techniques ◽  
Benzene Nucleus ◽  
Crystal Properties ◽  
Ft Ir ◽  
Alkoxy Groups ◽  
Gaussian Program ◽  
Mesomorphic Properties

The paper presents six homologues series of Schiff bases ether compounds distinguished by the length of terminal alkoxy groups which substituted on a side benzene nucleus. The above structures were demonstrated through the use of spectroscopic techniques, like FT- IR and 1H-NMR. Polarized hot stage optical microscopy was used to study both mesomorphic properties and phase transitions. The results showed that out of the six compounds only three (B2, B3 and B4) were pure (marble) nematic mesophase, while no liquid crystal properties for (B5, B6 and B7) compounds. The theoretical study for the electronic structures was intended to study the effects of alkyl chain length on the electronic structure by using Gaussian program, DFT and 6-31G as basis set. The theoretical results indicate that there is no effect to the terminal substituted alkoxy groups on the HOMO energies but there is an effect on LUMO energies through decreasing energy for the prepared compounds.

scholarly journals The Influence of Storage Conditions on the Biochemical Composition and Morphology of Dahlia Tubers

2016 ◽  
Vol 44 (2) ◽  
pp. 459-465 ◽  
Author(s):  
Ioana CIOBANU ◽  
Maria CANTOR ◽  
Razvan STEFAN ◽  
Erzsebet BUTA ◽  
Klara MAGYARI ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
Storage Conditions ◽  
Spectroscopic Techniques ◽  
Air Humidity ◽  
Raman Spectroscopic ◽  
Pathogen Invasion ◽  
Ft Ir ◽  
Biometric Measurements ◽  
C 30 ◽  
Ft Raman

The aim of this study was to assess by means of biometric measurements and FT-IR and FT-Raman spectroscopic techniques the influence of storage conditions on the morphology and biochemical composition of Dahlia tubers. Investigated samples belong to ‘Kennemerland’ and ‘Red Pygmy’ cultivars of the Dahlia hybrida species, which were preserved over winterat 5-8 °C, 30-40% air humidity in different substrates: sand, sand and sawdust, peat and sawdust. The biometric parameters revealed that the peat and sawdust substrate is the most appropriate one for tubers storage, whereas the sand substrate is the least suitable one. The inulin signature was evidenced in all tuber samples as well as the changes of biochemical composition induced by different storage conditions. The analysis of the FT-IR and FT-Raman spectra demonstrated that the inulinaccumulation inside the tubers is favourably influenced by the sand storage, and depends on the cultivar type. Moreover, it was established that the peat and sawdust substrate favours the polyacetylene formation inside the tubers probably because it facilitates the occurrence and development of pathogens inside the tuber. It was also found that the polyacetylene concentration increased, which is associated with the plant response to the pathogen invasion, depends on the cultivar type.

scholarly journals Spectroscopic Methods in the Evaluation of Modified Vegetable Base Oils from Crambe abyssinica

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3243 ◽  
Author(s):  
Michał Szmatoła ◽  
Justyna Chrobak ◽  
Rafał Grabowski ◽  
Jolanta Iłowska ◽  
Julia Woch ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Vegetable Oil ◽  
Supercritical Co2 ◽  
Spectroscopic Methods ◽  
Spectroscopic Techniques ◽  
Chemical Transformations ◽  
Chemical Changes ◽  
Crambe Abyssinica ◽  
Oxidation Processes ◽  
Ft Ir

Raw vegetable oil from Crambe abyssinica was subjected to oxidative treatment to enhance its viscosity. The oxidation processes were carried out in the presence of N-hydroxyphthalimide with or without supercritical CO2 as a solvent. Four spectroscopic techniques (Raman, UV-VIS, FT-IR, NMR) were applied to assess the chemical changes taking place during the oxidation. Raman and NMR spectroscopy proved best in the assessment of the chemical transformations leading to increased viscosity of the modified vegetable oil.

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