Fluorescence quenching of methanol-soluble polypyrimidine by aluminum ion

2020 ◽  
Vol 10 (7) ◽  
pp. 1177-1188
Author(s):  
Yuemaierjiang Maimaiti ◽  
Xieraili Maimaitiyiming
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Organic Solvent ◽  
Ir Spectrum ◽  
Good Recovery ◽  
Environment Friendly ◽  
Dichloromethane Solution ◽  
Soluble Polymers ◽  
Eds Analysis ◽  
Ft Ir

The different proportion methylpyrimidine ring copolymers has been synthesized and characterized by 1HNMR, 13CNMR and FT-IR spectrum. The detection limit of P80 for Al3+ ions of 7.94 × 10–8 M at the dichloromethane solution. The binding constant (Kb) between copolymers and with Al3+ was 1.10 × 104 M–1. The EDS analysis and XPS spectroscopy can expose that the copolymer and Al3+ had been coordination with each other. The neutral polymers with good recovery properties can be used as sensor detect Al3+ in the organic solvent. The methanol-soluble polymer has been synthesized from methylpyrimidine ring copolymers, and investigated acidochromic properties and found that the acidochromic property of the polymer was retained after quaternization, but cannot detect Al3+ in the methanol (MeOH). The methanol-soluble polymers using environment-friendly solvents such as methanol can be used in detect H+ in the methanol.

Synthesis, Characterization and Application of N,N-Dimethyl-N-Sulfoethan Ammonium tetra-Chloro Aluminate: A Novel micro-Heterogeneous Cata-lyst for Synthesis of tri-Arylmethanes

2020 ◽  
Vol 17 ◽  
Author(s):  
Saeid Azimi ◽  
Niloofar Mohamadighader
Keyword(s):  
Ionic Liquid ◽  
Heterogeneous Catalyst ◽  
Mass Spectroscopy ◽  
Aromatic Aldehydes ◽  
Solid Catalyst ◽  
Sem Images ◽  
One Pot ◽  
Acidic Catalyst ◽  
Eds Analysis ◽  
Ft Ir

Abstract: A new solid catalyst was synthesized from an ionic liquid and heterogenised by changing anion reaction. The new heterogeneous acidic catalyst was characterized by SEM images, EDS analysis, AFM images, Ft-IR, HNMR, 13CNMR and Mass Spectroscopy. It was applied to synthesis of tri-arylmethanes throughout one-pot tri-component reactions among aromatic aldehydes, N,N-dimethylaniline and other carbonic nucleophiles such as anisole and indole. Hence, synthesis of convenient and inexpensive micro-heterogeneous catalyst was introduced, the efficiency of which was confirmed. Also, various useful products were synthesized throughout this simple and clean procedure.

scholarly journals Research on FT-IR spectrum data mining of diesel engine lubricating oil

2021 ◽  
Vol 1883 (1) ◽  
pp. 012121
Author(s):  
Jing Li ◽  
Hongxiang Tian ◽  
Tingfeng Ming ◽  
Yunling Sun ◽  
Shuai Zhang
Keyword(s):  
Data Mining ◽  
Diesel Engine ◽  
Ir Spectrum ◽  
Lubricating Oil ◽  
Ft Ir ◽  
Spectrum Data

Synthesis of N2, N6-bis(5-methylthiazol-2-yl)pyridine-2,6-dicarboxamide fluoroscent sensor for detection of Cu2+ and Ni2+ Ions

Drug Research ◽  
2021 ◽  
Author(s):  
Anuroop Kumar ◽  
Netrapal Singh ◽  
Mordhwaj Kumar ◽  
Uma Agarwal
Keyword(s):  
Spectral Analysis ◽  
Detection Limit ◽  
Metal Ions ◽  
1H Nmr Spectroscopy ◽  
Stoichiometric Ratio ◽  
Selective Detection ◽  
Ft Ir ◽  
Uv Visible ◽  
Complexes With Metal Ions ◽  
Competitive Ions

AbstractThis article reports an amide based Chemosensor used for selective detection of divalent Cu+2 and Ni+2 ions via Fluorescence turn off. The selective sensing ability of Chemosensor was investigated in presence of different metal ions Mg2+, Ag+, Fe2+, K+, Cu2+, Ni2+, Hg2+, Pb2+, Mn2+, Pd2+, Cd2+ and Mn3+ as competitive ions. The receptor i. e. Chemosensor formed complexes with metal ions in 1:1 stoichiometric ratio. The detection limit and binding constant calculated as 1.92×10–4 and 1.4×10–4 M and 2.16×103 M−1 and 3.09×103 M−1 for Cu2+ and Ni2+ions respectively. The complexes were characterized by UV/visible, FT-IR, 13C NMR and 1H NMR spectroscopy. Further the structure and Crystallinity were calculated by P-XRD spectral analysis. The crystallinity found to be 65.27 and 67.87% respectively

scholarly journals Diverse resourcing of Nerium indicum leaves for bio-utilization

2020 ◽  
Vol 24 (3 Part A) ◽  
pp. 1785-1793
Author(s):  
Dongli Ma ◽  
Yuanyuan Chen ◽  
Yong Lai ◽  
Zanpei Zhang ◽  
Ximei Li ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Organic Solvents ◽  
Raw Materials ◽  
Chemical Constituents ◽  
Food Additives ◽  
Ornamental Plant ◽  
Bioactive Ingredients ◽  
Ft Ir ◽  
Medicinal Properties ◽  
Alcohol Benzene

Nerium indicum is an ornamental plant that is widely distributed in tropical and subtropical regions wordwide. It has toxic and medicinal properties which is closely related to the bioactive ingredients contained in Nerium indicum. In our research, the leaves of Nerium indicum was used as raw materials to study the chemical constituents and their effects. The chemical constituents of the leaves were analyzed by FT-IR and GC-MS with alcohol, benzene and acetone as organic solvents. A total of 73 compounds were obtained by acetone organic solvent, 25 compounds were extracted from benzene and 146 compounds were obtained from alcohol. Rich bioactive and bioenergy components were found in all three kinds of extract, suggesting that Nerium indicum leaves are of great significance for the diverse resourcing of bio-utilization including biomedicine, bioenergy, aroma, food additives.

scholarly journals Impact of non-covalent interactions on FT-IR spectrum and properties of 4-methylbenzylammonium nitrate. A DFT and Molecular docking study

Heliyon ◽  
2021 ◽  
pp. e08204
Author(s):  
Mouna Medimagh ◽  
Noureddine Issaoui ◽  
Sofian Gatfaoui ◽  
Silvia Antonia Brandán ◽  
Omar Al-Dossary ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Ir Spectrum ◽  
Docking Study ◽  
Molecular Docking Study ◽  
Ft Ir ◽  
Non Covalent Interactions ◽  
Covalent Interactions

scholarly journals RAPID INVESTIGATION OF THE METABOLITE CONTENT IN HIBISCUS SABDARIFFA var. UKMR-2 CULTIVATED UNDER THE INFLUENCE OF ELEVATED CO2 USING TRI-STEP FT-IR SPECTROSCOPY

2020 ◽  
Vol 83 (1) ◽  
pp. 75-83
Author(s):  
Siti Aishah Mohd Ali ◽  
Jalifah Latip
Keyword(s):  
Ir Spectroscopy ◽  
Elevated Co2 ◽  
Ir Spectrum ◽  
Food Authentication ◽  
2D Ir ◽  
Correlation Spectrum ◽  
Ft Ir ◽  
Metabolite Content ◽  
Co2 Treatment ◽  
Ft Ir Spectroscopy

Rapid methods based on untargeted analysis technique such as Fourier Transform Infrared (FT-IR) spectroscopy can provide much faster and easier solution for food authentication. However, studies on the metabolite content in UKMR-2 calyces using FT-IR spectroscopy has not been reported yet in any previous studies. Thus, the present study was performed to analyze the differences in metabolite content in UKMR-2 calyces under the influences of different [CO2] treatment by applying tri-step infrared based fingerprinting. The UKMR-2 plant cultivation was exposed to ambient [CO2] (400 µmol/mol) and elevated [CO2] (800 µmol/mol) treatment. The UKMR-2 calyx extracts were analysed by conventional infrared (1D-IR), second derivative infrared (SD-IR) and two-dimensional correlation infrared (2D-IR) spectroscopy. The 1D-IR spectrum results revealed a similar absorption spectrum in the range of 1900 - 650 cm-1, which suggest similar major metabolites content present in both extracts. For SD-IR spectrum, both treatments clearly showed have more peaks with different shape, position and intensity in the range of 1650 - 1450 cm-1 and 1200 - 950 cm-1, which is likely to have different flavonoid and carbohydrate content in UKMR-2 calyces. The 2D-IR synchronous correlation spectrum in the range of 1000 – 650 cm-1 clearly distinguished the metabolite content in the UKMR-2 calyx extract from different [CO2] treatment. Therefore, this tri-step infrared based fingerprinting has the potential as one of the effective methods to discriminate extract samples with similar infrared fingerprint features and indicate that the metabolite content in UKMR-2 calyces were influenced by different [CO2] treatments.

A donor–acceptor liganded metal–organic framework showcases the hydrogen-bond-enhanced sensing of N-heterocyclic explosives

2021 ◽  
Vol 9 (36) ◽  
pp. 12086-12093
Author(s):  
Junjie Wang ◽  
Yao Cheng ◽  
Jie Zhou ◽  
Weihua Tang
Keyword(s):  
Hydrogen Bond ◽  
Detection Limit ◽  
Fluorescence Quenching ◽  
Metal Organic Framework ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Organic Framework

Zn(ii)-based MOF for detecting FOX-7 like explosives is designed via hydrogen-bond-intensified host–guest interactions. The crystalline MOF achieves 0.14 ppm detection limit and a highest fluorescence quenching constant of 3.22 × 104 M−1.

Simple and environment-friendly method for graphene synthesis by using ultrasound.

2021 ◽  
Vol 17 ◽  
Author(s):  
Irena Markovska ◽  
Dimitar Georgiev ◽  
Fila Yovkova ◽  
Miroslav Abrashev
Keyword(s):  
Electrical Conductivity ◽  
Raman Spectroscopy ◽  
Monolayer Graphene ◽  
Conductivity Measurements ◽  
Environment Friendly ◽  
Complex Processes ◽  
Graphene Synthesis ◽  
Pure Graphite ◽  
Ft Ir ◽  
Electrodes For Supercapacitors

Background: This paper proposes a technology for the production of monolayer graphene by an easy, accessible, and non-toxic method. Methods: For the preparation of graphene, a combination of chemical and physical (ultrasonic) treatment of the original graphite precursor (purity >99%) was applied. The precursor of graphite is placed in a beaker with a solution of KOH or H2SO4. The mixtures were homogenized well and sonicated for 4h. The applied ultrasound has a power of 120 W, frequency 40 kHz. Due to the effects of ultrasound, complex processes take place in the solutions, which leads to the formation of superfine graphene. Better results were obtained at samples treated with 2n H2SO4. The physicochemical properties of the resulting graphene were characterized mainly by Raman spectroscopy, FT-IR, TEM, SEM, and electrical conductivity measurements. Results: Our research was focused mainly on the field of nanotechnology, in particular on the synthesis of graphene, which could be used as a coating on electrodes for supercapacitors. In this connection, three series of samples were developed in which the pristine graphite was treated with 2n H2SO4, 4n H2SO4, and 6n H2SO4, respectively, and their electrical properties were measured. Conclusion: The obtained graphene shows electrical resistivity 2-3 times lower than that of the precursor of pure graphite.

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