Physicochemical properties of novel cholinium ionic liquids for the recovery of silver from nitrate media

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 78268-78277 ◽  
Author(s):  
Rafael M. Rios-Vera ◽  
Juliette Sirieix-Plénet ◽  
Laurent Gaillon ◽  
Cécile Rizzi ◽  
Mario Ávila-Rodríguez ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Esi Ms ◽  
H Nmr ◽  
Extraction Properties ◽  
C Nmr

Linear and ramified cholinium based ionic liquids have been synthesized and their physicochemical properties have been investigated by 1H NMR, 13C NMR, ATR-FTIR and ESI-MS as well as their extraction properties towards Ag(i), Cu(ii) and Fe(iii).

scholarly journals Three New Biflavonoids from Chinese Dragon's Blood, Dracaena cochinchinensis

2012 ◽  
Vol 7 (5) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Jing Guan ◽  
Shun-Xing Guo
Keyword(s):  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Chemical Calculation ◽  
Dragon’S Blood ◽  
Esi Ms ◽  
H Nmr ◽  
Cd Spectrum ◽  
The Absolute ◽  
Circular Dichroïsm ◽  
C Nmr

Three new biflavonoids, named (2 Rγ S)-3′-methoxy-8-methylsocotrin-4′-ol (1), (2 Sγ R)-3′-methoxy-8-methylsocotrin-4′-ol (2), and (2 Rγ R)-8-methylsocotrin-4′-ol (3), were isolated from Chinese Dragon's blood [Dracaena cochinchinensis (Lour.) S. C. Chen], together with two known ones. The structures of these new biflavonoids were elucidated by a combination of HR-ESI-MS, 1H NMR, 13C NMR, HMQC, and HMBC spectra. The absolute configurations of compounds 1-4 were determined by quantum chemical calculation of the circular dichroism spectrum and comparison with the experimental CD spectrum.

Synthesis and Purification of L-Phenylalanine Oligo-Peptides Assisted by Phosphorus Oxychloride

2011 ◽  
Vol 365 ◽  
pp. 150-154
Author(s):  
Ming Xiu Lv ◽  
Li Ming Qiang ◽  
Kui Lu ◽  
Ying Yan Yao
Keyword(s):  
Self Assembly ◽  
Phosphorus Oxychloride ◽  
Inorganic Phosphorus ◽  
The Self ◽  
Reaction Products ◽  
Esi Ms ◽  
H Nmr ◽  
Rp Hplc ◽  
Proper Condition ◽  
C Nmr

Oligo-peptides have been focused on by chemists recently because of the strong bioactivity an activity as drug or precursor of drug. α-Amino acid could self-assemble into oligo-peptides with the assistance of inorganic phosphorus reagents, so it could provide a new method to synthesize peptides. In this paper, the self-assembly reaction of L-Phenylalanine mediated by phosphorus oxychloride were studied by using ESI-MS. The proper condition of self-assembly reaction of L-Phe was reported. The reaction products were purified by RP-HPLC and Phe-Phe dipeptide was characterized by the means of IR, 1H-NMR, 13C-NMR and ESI-MS/MS.

scholarly journals Physicochemical Properties of Extracellular Polymeric Substances Produced by Three Bacterial Isolates From Biofouled Reverse Osmosis Membranes

2021 ◽  
Vol 12 ◽  
Author(s):  
Zahid Ur Rehman ◽  
Johannes S. Vrouwenvelder ◽  
Pascal Saikaly
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
Reverse Osmosis ◽  
Biofilm Formation ◽  
Extracellular Polymeric Substances ◽  
Nmr Analysis ◽  
Bacterial Strains ◽  
H Nmr ◽  
Ro Membrane ◽  
C Nmr

This work describes the chemical composition of extracellular polymeric substances (EPS) produced by three bacteria (RO1, RO2, and RO3) isolated from a biofouled reverse osmosis (RO) membrane. We isolated pure cultures of three bacterial strains from a 7-year-old biofouled RO module that was used in a full-scale seawater treatment plant. All the bacterial strains showed similar growth rates, biofilm formation, and produced similar quantities of proteins and polysaccharides. The gel permeation chromatography showed that the EPS produced by all the strains has a high molecular weight; however, the EPS produced by strains RO1 and RO3 showed the highest molecular weight. Fourier Transform Infrared Spectroscopy (FTIR), Proton Nuclear Magnetic Resonance (1H NMR), and Carbon NMR (13C NMR) were used for a detailed characterization of the EPS. These physicochemical analyses allowed us to identify features of EPS that are important for biofilm formation. FTIR analysis indicated the presence of α-1,4 glycosidic linkages (920 cm–1) and amide II (1,550 cm–1) in the EPS, the presence of which has been correlated with the fouling potential of bacteria. The presence of α-glycoside linkages was further confirmed by 13C NMR analysis. The 13C NMR analysis also showed that the EPS produced by these bacteria is chemically similar to foulants obtained from biofouled RO membranes in previous studies. Therefore, our results support the hypothesis that the majority of substances that cause fouling on RO membranes originate from bacteria. Investigation using 1H NMR showed that the EPS contained a high abundance of hydrophobic compounds, and these compounds can lead to flux decline in the membrane processes. Genome sequencing of the isolates showed that they represent novel species of bacteria belonging to the genus Bacillus. Examination of genomes showed that these bacteria carry carbohydrates-active enzymes that play a role in the production of polysaccharides. Further genomic studies allowed us to identify proteins involved in the biosynthesis of EPS and flagella involved in biofilm formation. These analyses provide a glimpse into the physicochemical properties of EPS found on the RO membrane. This knowledge can be useful in the rational design of biofilm control treatments for the RO membrane.

scholarly journals Synthesis and properties of novel ammonium-based room-temperature gemini ionic liquids

RSC Advances ◽  
2018 ◽  
Vol 8 (46) ◽  
pp. 26255-26265 ◽  
Author(s):  
Xuzhao Yang ◽  
Yun Fang
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
H Nmr ◽  
C Nmr

Ammonium-based asymmetrical gemini ionic liquids, 1-trimethylammonium-3-(pyridinium)propane bisdicyanamide and 1-trimethylammonium-3-(1-methylpiperidinium)propane bisdicyanamide were respectively synthesized and characterized by 1H NMR and 13C NMR.

Synthesis and molecular recognition of the uridine-containing derivative of p-tert-butylcalix[4]arene

2003 ◽  
Vol 81 (9) ◽  
pp. 1019-1024 ◽  
Author(s):  
Jian Liang ◽  
Haiying Fu ◽  
Yu Liu ◽  
Li Wang ◽  
Zhifeng Ye ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Molecular Recognition ◽  
Association Constant ◽  
Hydrogen Bond Interaction ◽  
Esi Ms ◽  
Tert Butyl ◽  
H Nmr ◽  
Bond Interaction ◽  
C Nmr ◽  
Hypochromic Effect

The new uridine-containing derivative of p-tert-butylcalix[4]arene — 5,11,17,23-tetra-tert-butyl-25,26,27-trihydroxyl-28-oxyuridinecalix[4]arene (CU) — was synthesized and characterized by 1H NMR, 13C NMR, IR, EI-MS, and ESI-MS spectra. By the aid of UV–vis spectra, the molecular recognition of CU was studied. The hypochromic effect in UV–vis spectra showed the obvious molecular recognition of CU to ATP. This recognition is actually the hydrogen bond interaction between the uracil group of CU and the base radical of ATP. The association constant between CU and adenine was determined by UV titration at low concentrations.Key words: calixarene, uridine, molecular recognition, UV–vis spectra.

scholarly journals Lignans from the Whole Plants of Hedyotis uncinella

2016 ◽  
Vol 11 (8) ◽  
pp. 1934578X1601100
Author(s):  
Yaping Pan ◽  
Yan Zhang ◽  
Chao Fan ◽  
Yu Zhang ◽  
Shikai Yan ◽  
...  
Keyword(s):  
2D Nmr ◽  
Esi Ms ◽  
H Nmr ◽  
Whole Plants ◽  
C Nmr

Two new lignans, named (7R, 8 S)-balanophonin (1) and (7R, 8 S)-tomentosanan A (2), together with eight known lignans, burselignan (3), (+)-isolariciresinol (4), (+)-lyoniresinol (5), 5-methoxy-(+)-isolariciresinol (6), (-)-syringaresinol (7), (+)-epipinoresinol (8), (-)-(7′ S, 8 S, 8′ R)-4,4′-dihydroxy-3, 3′, 5, 5′-tetramethoxy-7, 9-epoxy-lignan-9′-ol-7-one (9), and (-)-(7 R, 8 S)-dihydrodehydrodiconiferyl alcohol (10) were isolated from the whole plants of Hedyotis uncinella Hook. et Arn. Structures of these compounds were elucidated through 1H NMR, 13C NMR, 2D NMR, ESI-MS and CD data.

A chiral BINOL-based Gemini amphiphilic gelator and its specific discrimination of native arginine by gelation in water

Soft Matter ◽  
2017 ◽  
Vol 13 (32) ◽  
pp. 5453-5462 ◽  
Author(s):  
Lihua Jia ◽  
Jianxin Yin ◽  
Xiangfeng Guo ◽  
Guangzhou Cao ◽  
Xuhua Tian ◽  
...  
Keyword(s):  
Esi Ms ◽  
H Nmr ◽  
Axially Chiral ◽  
Ft Ir ◽  
C Nmr

A novel axially chiral cationic Gemini amphiphile gelator (S1) derived from (S)-BINOL has been synthesized and characterized by 1H NMR, 13C NMR, ESI-MS and FT-IR analyses.

Flavonoids from Achillea nobilis L.

2003 ◽  
Vol 58 (1-2) ◽  
pp. 11-16 ◽  
Author(s):  
Liselotte Krenn ◽  
Anca Miron ◽  
Enne Pemp ◽  
Ursula Petr ◽  
Brigitte Kopp
Keyword(s):  
Methyl Ether ◽  
Methanolic Extract ◽  
2D Nmr ◽  
Spectroscopic Methods ◽  
Esi Ms ◽  
H Nmr ◽  
Aerial Parts ◽  
Nmr Techniques ◽  
C Nmr

The detailed investigation of a methanolic extract of aerial parts of Achillea nobilis resulted in the isolation of 10 flavonoids. A new C-glycosylflavone, luteolin-6-C-apiofuranosyl-(1‴→2″)-glucoside, was isolated besides orientin, isoorientin, vitexin, isoschaftoside, luteolin- 7-O-β-glucuronide, luteolin-4′-O-β-glucoside and quercetin-3-O-methyl ether and two rare flavonolglycosides, quercetin-3-O-α-arabinosyl-(1‴→6″ )-glucoside and quercetin-3-O-methylether-7-O-β-glucoside. The structures were established either by comparison with authentic substances or by UV, 1H NMR and 13C NMR spectroscopic methods including 2ᴅ-NMR techniques and ESI-MS

Extractive Desulphurization of Model Oil Using Sulphonium Based Ionic Liquids

2014 ◽  
Vol 625 ◽  
pp. 205-208 ◽  
Author(s):  
Kallidanthiyil Chellappan Lethesh ◽  
Nurul Hidayah Binti Hasnan ◽  
Mohammed Ibrahim Abdul Mutalib
Keyword(s):  
Thermal Decomposition ◽  
Ionic Liquids ◽  
Nmr Spectroscopy ◽  
Physicochemical Properties ◽  
Ftir Spectroscopy ◽  
Elemental Analysis ◽  
Decomposition Temperature ◽  
Thermal Decomposition Temperature ◽  
H Nmr ◽  
Model Oil

Synthesis of a novel class of cyclic sulphonium based ionic liquids was performed. The ionic liquids were characterized using 1H NMR spectroscopy, FTIR spectroscopy and CHNS elemental analysis. The physicochemical properties of the ionic liquids such as density viscosity and thermal decomposition temperature of the synthesized ionic liquids were determined. The potential of these ionic liquids for the extractive desulphurization of model oil was investigated.

Synthesis, physicochemical properties and electrochemistry of morpholine-substituted phthalocyanines

2010 ◽  
Vol 14 (07) ◽  
pp. 605-614 ◽  
Author(s):  
Ayfer K. Burat ◽  
Atıf Koca ◽  
Jan P. Lewtak ◽  
Daniel T. Gryko
Keyword(s):  
Physicochemical Properties ◽  
Electrochemical Properties ◽  
Spectroscopic Data ◽  
Cobalt Phthalocyanine ◽  
Redox Processes ◽  
Free Base ◽  
H Nmr ◽  
Diffusion Controlled ◽  
Reversible Redox ◽  
C Nmr

The synthesis, spectroscopic and electrochemical properties of new phthalocyanines bearing four morpholine and four chloro units is reported. Two-step synthesis involved efficient nucleophilic substitution of 4,5-dichlorophthalonitrile as the key step. The free-base phthalocyanine and its several complexes have been characterized using UV-vis, IR, 1H NMR , 13C NMR and mass spectroscopic data. Voltammetric and spectroelectrochemical studies show that while cobalt phthalocyanine gives both metal- and ring-based, diffusion-controlled, multi-electron and reversible/quasi-reversible redox processes, other complexes give ring-based, multi-electron and reversible/quasi-reversible redox processes.

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