scholarly journals Synthesis and Characterization of Acrylamide-Based Anionic Copolymer and Investigation of Solution Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
H. Jamshidi ◽  
A. Rabiee
Keyword(s):  
Molecular Weight ◽  
Nmr Spectroscopy ◽  
Solution Viscosity ◽  
Feed Ratio ◽  
Reaction Conditions ◽  
Aqueous Sodium Chloride Solution ◽  
Shear Rates ◽  
High Molecular Weight Product ◽  
C Nmr

The copolymer of acrylamide (AM) and 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) was synthesized through radical solution polymerization by potassium persulfate as initiator. By changing the AMPS feed ratio from 10 to 70%, and keeping other reaction conditions constant, different copolymers were synthesized. The techniques of Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H-13C-NMR) spectroscopy were used for identification of functional groups and confirmation of copolymers’ structure. Intrinsic and apparent viscosity of samples were measured in aqueous sodium chloride solution under standard conditions. The anionic degree of copolymers was determined by back titration method and by13C-NMR spectroscopy. Molecular weight of copolymers was determined by the Mark-Houwink relationship. The measured molecular weight of samples showed that we have acquired a high molecular weight product. The effect of different range of shear rates on solution viscosity was evaluated. The copolymer solutions showed non-Newtonian shear thinning behavior. The performance of copolymers with respect to shear resistance and molecular weight was evaluated from industry application standpoint.

Characterization of New Inorganic- Organic Hybrid Compounds: (C6H10N2).Cl2 (I), [C6H10N2]2ZnCl4 (II): Crystal Structure, Hirschfield Surface, IR and NMR spectroscopy Analysis.

2021 ◽  
Author(s):  
nejeh hannachi ◽  
faouzi hlel
Keyword(s):  
Nmr Spectroscopy ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Absorption Bands ◽  
Monoclinic System ◽  
Xrd Pattern ◽  
Organic Hybrid ◽  
C Nmr

Abstract Two new organic-inorganic hybrid materials, (C6H10N2).Cl2 (I) and [C6H10N2]2ZnCl4 (II), have been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction and XRD pattern investigations. These two compounds are crystallized in the monoclinic system; C2/c space group. In the both structures, the anionic-cationic entities are interconnected by hydrogen bonding contacts and p-p Interaction forming three-dimensional networks. Intermolecular interactions were investigated by Hirshfeld surfaces and the contacts of the four different chloride atoms in (II) were compared. The vibrational absorption bands were identified by infrared spectroscopy. These compounds were also investigated by solid state 13C NMR spectroscopy.

scholarly journals Efficient resolution of racemic crown-shaped cyclotriveratrylene derivatives and isolation and characterization of the intermediate saddle isomer

2019 ◽  
Vol 15 ◽  
pp. 1339-1346
Author(s):  
Sven Götz ◽  
Andreas Schneider ◽  
Arne Lützen
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Nmr Spectroscopy ◽  
High Performance ◽  
Chiral Stationary Phase ◽  
Hplc Separation ◽  
Promising Alternative ◽  
Isolation And Characterization ◽  
C Nmr

The preparative resolution of a trifunctionalized C 3-symmetrical chiral cyclotriveratrylene derivative was achieved via high-performance liquid chromatography (HPLC) on a chiral stationary phase. This approach is a promising alternative to the previously reported resolution through formation of diastereomeric esters because it involves fewer synthetic steps and is less prone to thermal (re)racemization. During these studies an intermediate saddle conformer could also be isolated and characterized by 1H and 13C NMR spectroscopy. The HPLC separation method was further developed in order to allow investigations on the racemization behavior of the cyclotriveratrylene derivative.

scholarly journals Synthesis and Single Crystal X-Ray Structure of Bis[4-oxo-3- (2-ethoxycarbonylphenyl)-3,4-dihydroquinazolin-2-yl]disulfide

2009 ◽  
Vol 64 (9) ◽  
pp. 1065-1069 ◽  
Author(s):  
Mehdi Rimaz ◽  
Jabbar Khalafy ◽  
Khadijeh Tavana ◽  
Katarzyna Ślepokura ◽  
Tadeusz Lis ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Structure Determination ◽  
Room Temperature ◽  
Sodium Ethoxide ◽  
Reaction Conditions ◽  
X Ray ◽  
Ethyl Nitroacetate ◽  
C Nmr

Diethyl 2,2´-thiocarbonyl-bis(azanediyl)dibenzoate was synthesized from the reaction of ethyl anthranilate with thiophosgene. Its treatment with sodium ethoxide in ethanol at room temperature gave ethyl 2-(4-oxo-2-thioxo-1,2-dihydroquinazolin-3(4H)-yl) benzoate, whereas in the presence of ethyl nitroacetate and under the same reaction conditions, the corresponding bis(quinazolin)disulfide was formed. Its structure was confirmed by IR, 1H and 13C NMR spectroscopy elemental analysis and single crystal X-ray structure determination.

scholarly journals Apigenin Di- and Trirhamnoside from Asplenium normale in Malaysia

2010 ◽  
Vol 5 (1) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Tsukasa Iwashina ◽  
Sadamu Matsumoto ◽  
Junichi Kitajima ◽  
Takehisa Nakamura ◽  
Goro Kokubugata ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Structures ◽  
C Nmr

Two new flavone rhamnosides, apigenin 7-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranoside and apigenin 7-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranoside-4′-O-α-L-rhamnopyranoside were isolated from the fronds of Asplenium normale D. Don, together with two known C-glycosylflavones, vicenin-2 and lucenin-2. The chemical structures of the isolated glycosides were established by UV, LC-MS, characterization of acid hydrolysates, and 1H and 13C NMR spectroscopy.

scholarly journals Acylated Delphinidin Glycosides from Violet and Violet-Blue Flowers of Clematis Cultivars and their Coloration

2013 ◽  
Vol 8 (11) ◽  
pp. 1934578X1300801 ◽  
Author(s):  
Keisuke Sakaguchi ◽  
Junichi Kitajima ◽  
Tsukasa Iwashina
Keyword(s):  
Nmr Spectroscopy ◽  
Absorption Spectra ◽  
Buffer Solution ◽  
Visible Absorption ◽  
Chemical Structures ◽  
Crude Extracts ◽  
Kaempferol Glycosides ◽  
C Nmr

Three new acylated delphinidin glycosides, delphinidin 3- O-β-[(2″- trans-caffeoylglucopyranosyl)-(1→2)-(6″-succinylgalactopyranoside)]–7- O-β-glucopyranoside (1), delphinidin 3- O-β-[(2″- trans-caffeoylglucopyranosyl)-(1→2)-(6″- trans-caffeoyl-tartaroyl-malonylgalactopyranoside)]–7- O-β-glucopyranoside (2), and delphinidin 3- O-β-[(2″- trans-caffeoylglucopyranosyl)-(1→2)-(6″- trans-caffeoyl-tartaroyl-malonylgalactopyranoside)]–3′- O-β-glucuronopyranoside (3), were isolated from the violet and violet-blue sepals of Clematis cultivars ‘Jackmanii Superba’ and ‘Fujimusume’. The chemical structures of the isolated anthocyanins were determined by LC-MS, characterization of hydrolyzates, and UV, 1H and 13 C NMR spectroscopy. The visible absorption spectra of these anthocyanins were compared with those of fresh sepals and crude extracts in pH 5.1 buffer solution. In addition, the co-pigment effect with some kaempferol glycosides and caffeoylglucose was examined.

Molecular weight and solution viscosity characterization of PVC

1993 ◽  
Vol 15 (2) ◽  
pp. 105-108 ◽  
Author(s):  
D. E. Skillicorn ◽  
G. G. A. Perkins ◽  
A. Slark ◽  
J. V. Dawkins
Keyword(s):  
Molecular Weight ◽  
Solution Viscosity

Protodeborylation of Triorganoboranes

2008 ◽  
Vol 63 (3) ◽  
pp. 275-279 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Ezzat Khan ◽  
Rhett Kempe
Keyword(s):  
Molecular Structure ◽  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Gas Phase ◽  
Appreciable Amount ◽  
Reaction Conditions ◽  
X Ray ◽  
Nmr Parameters ◽  
C Nmr

Protodeborylation of triorganoboranes, usually carried out under mild reaction conditions using an excess of acetic acid, affords 1,5-dialkyl-3,7-dimethyl-4,8,9-trioxa-2,6-dioxonia-1,5-diboratabicyclo [3.3.1]nona-2,6-dienes OB(R)OC(Me)OB(R)OC(Me)O [1 (R = Et), 2 (R = cyclooctyl)]. Acetoxy(dialkyl) boranes and di(acetoxy)alkylboranes were not formed in an appreciable amount. Compounds 1 and 2 were characterized by NMR spectroscopy (1H, 11B, 13C NMR) in solution, the molecular structure of 2 was determined by X-ray analysis. The gas-phase geometry of 1 was optimized by calculations [B3LYP/6-311+G(d, p) level of theory], and its NMR parameters were also calculated at the same level of theory.

The characterization of clay-organic systems

Clay Minerals ◽  
1982 ◽  
Vol 18 (4) ◽  
pp. 357-371 ◽  
Author(s):  
D. T. B. Tennakoon ◽  
R. Schlögl ◽  
T. Rayment ◽  
J. Klinowski ◽  
W. Jones ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Catalytic Properties ◽  
Clear Distinction ◽  
Organic Systems ◽  
Catalytically Active ◽  
Natural Clays ◽  
Temperature Controlled ◽  
C Nmr

AbstractThe importance of a number of techniques (including1H and13C NMR, XRD and IR) in exploring the important catalytic properties of synthetic and natural clays is described. A clear distinction is observed between proven catalytically-active clays (e.g. Al-exchanged) and those which are generally less effective (e.g. Na-exchanged).13C NMR spectroscopy is used to identify directly products formed within the interlayer regions, and temperature-controlled powder XRD serves as a useful tool for identifying whether or not intercalation occurs under variously defined conditions. High-pressure XRD is used to verify the formation of different products during reaction.

Strukturermittlung der Reduktionsprodukte von Pyridostigmin mit NaBH4 / Determination of the Structure of Products of the Reduction of Pyridostigmine with NaBH4

1985 ◽  
Vol 40 (10) ◽  
pp. 1401-1408
Author(s):  
Volker Horstmann ◽  
Günter Häfelinger
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Structure ◽  
Main Product ◽  
Reaction Conditions ◽  
C Nmr

The chemical structure of 5 different products of pyridostigmine obtained by reduction with NaBH4 was determined by GC-MS and subsequently confirmed by means of 1H and 13C NMR spectroscopy. Reaction conditions leading almost exclusively to the main product: 3-[(N,N-dimethyl)-carbamoyl]-1-m ethyl-1,2,5,6-tetrahydropyridine (4) have been determined.

Sign in / Sign up

Export Citation Format

Share Document