2D NMR study in the novel superconductor

2005 ◽  
Vol 359-361 ◽  
pp. 485-487 ◽  
Author(s):  
Chishiro Michioka ◽  
Masaki Kato ◽  
Takeshi Waki ◽  
Kazuyoshi Yoshimura ◽  
Kenji Ishida ◽  
...  
Keyword(s):  
2D Nmr ◽  
The Novel ◽  
Nmr Study

Two-dimensional NMR studies of acrylate copolymers

2009 ◽  
Vol 81 (3) ◽  
pp. 389-415 ◽  
Author(s):  
A. S. Brar ◽  
Ashok Kumar Goyal ◽  
Sunita Hooda
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Quantum Coherence ◽  
Multiple Bond ◽  
Microstructural Analysis ◽  
2D Nmr ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Poly Methyl Methacrylate ◽  
Nmr Study

High-resolution NMR spectroscopy is the most versatile, reliable, and generally acceptable technique for the determination of the microstructure of polymers. 2D NMR techniques, along with 1D NMR, have more potential to study absolute configurational assignments and sequence distribution of copolymers. Physical and chemical properties of polymers are influenced fundamentally by their microstructure. We discuss the detailed microstructure analysis of a large number of homopolymers, copolymers, and terpolymers. 2D NMR study of poly(methyl methacrylate) (PMMA), poly(methyl acrylate) (PMA), and poly(methacrylonitrile) (PMAN) is discussed in this article. In addition to homopolymers, 2D heteronuclear single-quantum coherence (HSQC), total correlation spectroscopy (TOCSY), and heteronuclear multiple-bond correlation (HMBC) study of different copolymers such as poly(methyl methacrylate-co-methyl acrylate), poly(styrene-co-methyl methacrylate), and poly(methyl methacrylate-co-methacrylonitrile) have also been reported here. This in turn helps in microstructural analysis of terpolymers such as poly(methacrylonitrile-co-styrene-co-methyl methacrylate), poly(acrylonitrile-co-methyl methacrylate-co-methyl acrylate), and poly(ethylene-co-vinyl acetate-co-carbon monoxide).

Conformational studies in solution on cyclolinopeptide A analogs. A 2D NMR study of cyclo{Pro1-Pro-phe-Phe-Ac6c-lle-ala-Val8}

Peptides ◽  
1993 ◽  
pp. 223-226
Author(s):  
M. Mazzeo ◽  
C. Pedone ◽  
L. Paolilio ◽  
V. Pavone ◽  
C. Isernia ◽  
...  
Keyword(s):  
2D Nmr ◽  
Conformational Studies ◽  
Nmr Study

2D NMR Study of Ajmaline

Heterocycles ◽  
1986 ◽  
Vol 24 (2) ◽  
pp. 331 ◽  
Author(s):  
Mauri Lounasmaa ◽  
Ari M. P. Koskinen
Keyword(s):  
2D Nmr ◽  
Nmr Study

NMR study of heterogeneity in pyridine-N-oxide...HCl crystal

Open Physics ◽  
2004 ◽  
Vol 2 (1) ◽  
Author(s):  
Vytautas Balevicius ◽  
Alexandar Gacesa ◽  
Janez Plavec
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Solid Phase ◽  
Mixing Time ◽  
Exchange Process ◽  
2D Nmr ◽  
Spin Coupling ◽  
Nmr Study ◽  
2D Nmr Spectra ◽  
Heterogeneous Phase

AbstractAn origin of narrow 1H NMR signals in pyridine-N-oxide (PyO)...HCl crystal has been investigated by means of MAS, SPEDAS, NOESY and COSY techniques. Spectra of crystalline samples are compared with those of solid phase obtained from liquid PyO...HCl solutions (in acetonitile/H2O) after the heterogeneous phase separation. It has been concluded that partially resolved peaks in 1H NMR spectra of solids are related with heterogeneity of spin system and presence of different H-bond clusters of water molecules. NOESY spectra show no cross-peaks even at very long mixing time (500 ms). This indicates there is no exchange process between spins causing different peaks, and thus the corresponding molecular aggregates are captured in “islands of mobility8 without any channels sufficient for exchange. Appearance of MAS side bands as “pseudo8 cross-peaks in 2D NMR spectra using MAS/COSY technique is reported. In the case of accidental coincidence of spinning frequency (ωMAS) with spectral distances between some diagonal signals, intensive non-diagonal peaks are observed at the corresponding cross-positions. A misleading conclusion concerning spin coupling is easy to avoid using various ωMAS.

Vulcanization of Butadiene Rubber by Means of Cyclic Disulfides. 1. A 2D NMR Study on the Cross-Link Structure of a BR Model Compound Vulcanizate

1999 ◽  
Vol 32 (22) ◽  
pp. 7504-7508 ◽  
Author(s):  
Roger M. Seyger ◽  
Ron Hulst ◽  
John P. M. van Duynhoven ◽  
Robin Winters ◽  
Leen van der Does ◽  
...  
Keyword(s):  
Model Compound ◽  
2D Nmr ◽  
Butadiene Rubber ◽  
Cross Link ◽  
Link Structure ◽  
Nmr Study ◽  
The Cross

A proton 2D-NMR study of an oligodeoxyribonucleotide containing N6-methyladenine: d(GGm6ATATCC)

Biochimie ◽  
1985 ◽  
Vol 67 (7-8) ◽  
pp. 819-822 ◽  
Author(s):  
G FAZAKERLEY ◽  
A GUY ◽  
R TEOULE ◽  
E QUIGNARD ◽  
W GUSCHLBAUER
Keyword(s):  
2D Nmr ◽  
Nmr Study

2D NMR Study on 4-O-Tetrahydropyranylepiisopicropodophyllin

1996 ◽  
Vol 29 (8) ◽  
pp. 1531-1538
Author(s):  
Qianrong Li ◽  
Xiaohan Peng ◽  
Qin Liu ◽  
Haigen Shen
Keyword(s):  
2D Nmr ◽  
Nmr Study

scholarly journals Novel ion-binding C3 symmetric tripodal triazoles: synthesis and characterization

2014 ◽  
Vol 12 (1) ◽  
pp. 115-125 ◽  
Author(s):  
Gábor Neumajer ◽  
Gergő Tóth ◽  
Szabolcs Béni ◽  
Béla Noszál
Keyword(s):  
2D Nmr ◽  
Ion Binding ◽  
The Novel ◽  
Spectrometric Data ◽  
Polydentate Ligands ◽  
Nmr Techniques ◽  
Sonogashira Reactions ◽  
Symmetric Ligands ◽  
Complexation Process

AbstractNovel C3 symmetric tripodal molecules were synthesized from cyclohexane 1,3,5-tricarboxylic acid. Utilizing click and Sonogashira reactions, ion-binding triazole and pyridazin-3(2H)-one units were incorporated to form polydentate ligands for ion complexation. The structures of the novel C3 symmetric derivatives were extensively characterized by 1H, 13C and 2D NMR techniques along with HRMS and IR. The copper(I)-binding potentials of these ligands were investigated by using them as additives in model copper(I)-catalysed azide-alkyne cycloaddition (CuAAC) reactions. The copper(I) complexation ability of our compound was also proved by different spectroscopic methods, such as mass spectrometry, UV and NMR spectroscopy. Based on the mass spectrometric data all of the C3 symmetric ligands formed 1:1 complex with copper(I) ion. The specific role of C3 symmetric polydentate form in the complexation process was also discussed

1D and 2D NMR study of ionic conductivity in CsDSO4

1997 ◽  
Vol 97 (1-4) ◽  
pp. 141-144 ◽  
Author(s):  
G Lahajnar ◽  
R Blinc ◽  
J Dolinšek ◽  
D Arčon ◽  
J Slak
Keyword(s):  
Ionic Conductivity ◽  
2D Nmr ◽  
Nmr Study

scholarly journals Characterization and 2D NMR study of the stable [9-21, 15-27] 2 disulfide intermediate in the folding of the 3 disulfide trypsin inhibitor EETI II

1993 ◽  
Vol 2 (2) ◽  
pp. 165-174 ◽  
Author(s):  
D. Le-Nguyen ◽  
A. Heitz ◽  
L. Chiche ◽  
M. El Hajji ◽  
B. Castro
Keyword(s):  
Trypsin Inhibitor ◽  
2D Nmr ◽  
Nmr Study
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