Silylamido supported dinitrogen heterobimetallic complexes: Syntheses and their catalytic ability

National Science Review ◽

10.1093/nsr/nwaa290 ◽

2020 ◽

Author(s):

Dan-dan Zhai ◽

Si-jun Xie ◽

Yi Xia ◽

Hua-yi Fang ◽

Zhang-jie Shi

Keyword(s):

1H Nmr ◽

Catalytic Reaction ◽

Nmr Spectrum ◽

Nitrogen Ligand ◽

Heterobimetallic Complexes ◽

Dinitrogen Complexes ◽

Terminal Alkenes

Abstract Molybdenum dinitrogen complexes supported by monodentate arylsilylamido ligand, [Ar(Me3Si)N]3MoN2Mg(THF)2[N(SiMe3)Ar] (5) and [Ar(Me3Si)N]3MoN2SiMe3 (6) (Ar = 3,5-Me2C6H3) were synthesized and structurally characterized, which were proved to be effective catalysts for the disproportionation of cyclohexadienes and isomerization of terminal alkenes. 1H NMR spectrum suggested that the bridging nitrogen ligand remains intact during the catalytic reaction, indicating the possible catalytic ability of Mo-N = N motif.

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1H NMR spectrum of the native human insulin monomer. Evidence for conformational differences between the monomer and aggregated forms.

Journal of Biological Chemistry ◽

10.1016/s0021-9258(19)39381-0 ◽

1990 ◽

Vol 265 (10) ◽

pp. 5448-5452

Author(s):

M Roy ◽

R W Lee ◽

J Brange ◽

M F Dunn

Keyword(s):

Human Insulin ◽

1H Nmr ◽

Nmr Spectrum

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Study on the Inclusion Behavior of Cucurbit [n] uril with Phenylalanine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.1153 ◽

2011 ◽

Vol 197-198 ◽

pp. 1153-1156

Author(s):

Ning Chen ◽

Ya Bin Li

Keyword(s):

1H Nmr ◽

Interaction Mechanism ◽

Acetate Buffer Solution ◽

Molar Ratio ◽

High Concentration ◽

Buffer Solution ◽

Visible Absorption ◽

Nmr Spectrum ◽

Application Range ◽

Uv Visible

The characteristics of host-guest complexes between cucurbit[n]uril (CB [n]) and phenylalanine were investigated by UV-visible absorption spectroscopy in acetate buffer solution at room temperature. It was found that the UV-visible absorption increased steadily with constantly dropping the high concentration of cucurbit[6]uril (CB [6]) and cucurbit[8]uril (CB [8]) in the phenylalanine solution which indicates that there are some interaction betweenCB [n] and phenylalanine.Then CB [6] and phenylalanine at molar ratio of 1:1 to weigh while CB [8] and phenylalanine at molar ratio of 1:2, respectively, are both demonstrated by 1H NMR spectra. 1H NMR spectrum of complexes was obtained, indicating an enthalpic driving force for host-guest complexes. The possible interaction mechanism and inclusion mode were also discussed. This work may extend the application range of CB [n] in supramolecular and pharmaceutical analysis.

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Identification of Methyl Resonances in the 1H NMR Spectrum of Incubated Blood Cell Lysates

Journal of Biological Chemistry ◽

10.1016/s0021-9258(18)94147-5 ◽

1989 ◽

Vol 264 (4) ◽

pp. 2100-2107 ◽

Cited By ~ 1

Author(s):

G L Mendz ◽

M N McCall ◽

P W Kuchel

Keyword(s):

Blood Cell ◽

1H Nmr ◽

Nmr Spectrum ◽

Cell Lysates

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Solving the 31P{1H} NMR spectrum of (Me3Si)3P7 as B[AC]3 case

Phosphorus Sulfur and Silicon and the Related Elements ◽

10.1080/10426507.2017.1287705 ◽

2017 ◽

Vol 192 (6) ◽

pp. 727-731

Author(s):

Eberhard Matern ◽

Michael Engelhardt ◽

Gerhard Hägele

Keyword(s):

1H Nmr ◽

Nmr Spectrum

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One-Dimensional 13C NMR Is a Simple and Highly Quantitative Method for Enantiodiscrimination

Molecules ◽

10.3390/molecules23071785 ◽

2018 ◽

Vol 23 (7) ◽

pp. 1785 ◽

Cited By ~ 5

Author(s):

Peter Lankhorst ◽

Jozef van Rijn ◽

Alexander Duchateau

Keyword(s):

1H Nmr ◽

13C Nmr ◽

Quantitative Method ◽

Enantiomeric Excess ◽

Nmr Spectrum ◽

One Dimensional ◽

Nmr Method ◽

Relative Standard ◽

Excess Value ◽

Chiral Solvating Agent

The discrimination of enantiomers of mandelonitrile by means of 1D 13C NMR and with the aid of the chiral solvating agent (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol (TFAE) is presented. 1H NMR fails for this specific compound because proton signals either overlap with the signals of the chiral solvating agent or do not show separation between the (S)-enantiomer and the (R)-enantiomer. The 13C NMR method is validated by preparing artificial mixtures of the (R)-enantiomer and the racemate, and it is shown that with only 4 mg of mandelonitrile a detection limit of the minor enantiomer of 0.5% is obtained, corresponding to an enantiomeric excess value of 99%. Furthermore, the method shows high linearity, and has a small relative standard deviation of only 0.3% for the minor enantiomer when the relative abundance of this enantiomer is 20%. Therefore, the 13C NMR method is highly suitable for quantitative enantiodiscrimination. It is discussed that 13C NMR is preferred over 1H NMR in many situations, not only in molecules with more than one chiral center, resulting in complex mixtures of many stereoisomers, but also in the case of molecules with overlapping multiplets in the 1H NMR spectrum, and in the case of molecules with many quaternary carbon atoms, and therefore less abundant protons.

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