Accurate Determination of Passive Coupling Constants by Analysis of Complementary Two-Dimensional Cross-Peak Multiplets

1996 ◽  
Vol 118 (1) ◽  
pp. 126-131 ◽  
Author(s):  
Damien Jeannerat ◽  
Geoffrey Bodenhausen
Keyword(s):  
Accurate Determination ◽  
Cross Peak ◽  
Coupling Constants ◽  
Two Dimensional

Convenient Sign Determination of Various Coupling Constants in Alkynylplatinum(II) Phosphine Complexes

1991 ◽  
Vol 46 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Bernd Wrackmeyer
Keyword(s):  
Coupling Constants ◽  
Two Dimensional ◽  
Model Compounds ◽  
Standard Equipment ◽  
Phosphine Complexes ◽  
Sign Determination

(1)The utilization of two-dimensional (2 D) 13C /1H , 31P/1H and 195Pt/1H heteronuclear shift correlations for the sign determination of various coupling constants [e.g., 2J(31PPt13C) > 0 (trans), 2J(31PPt13C) < 0 (cis), 3J( 31PPtC13C) > 0 (cis, trans), 4J(31PPtCC1H ) > 0 (trans), 4J(31PCC1H ) < 0 (cis), 3J(195PtCC1H ) > 0, 2J(31PC1H ) < 0, etc.] is demonstrated, using standard equipment. The complexes [trans-(Bu3P)2Pt(C ≡ C -H)2] and [cis-(Et2PCH2CH2PEt2)Pt(C ≡ C - H)2] (2) serve as model compounds.

scholarly journals Accurate determination of one-bond heteronuclear coupling constants with “pure shift” broadband proton-decoupled CLIP/CLAP-HSQC experiments

2014 ◽  
Vol 239 ◽  
pp. 130-138 ◽  
Author(s):  
István Timári ◽  
Lukas Kaltschnee ◽  
Andreas Kolmer ◽  
Ralph W. Adams ◽  
Mathias Nilsson ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Coupling Constants ◽  
Heteronuclear Coupling

scholarly journals Two-dimensional flow nanometry of biological nanoparticles for accurate determination of their size and emission intensity

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Stephan Block ◽  
Björn Johansson Fast ◽  
Anders Lundgren ◽  
Vladimir P. Zhdanov ◽  
Fredrik Höök
Keyword(s):  
Emission Intensity ◽  
Accurate Determination ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow

scholarly journals Fluorescence Assay for the Determination of d-Panthenol Based on Novel Ring-Fused 2-Pyridone Derivative

2020 ◽  
Vol 21 (21) ◽  
pp. 8386
Author(s):  
Wiktor Kasprzyk ◽  
Tomasz Świergosz ◽  
Filip Koper
Keyword(s):  
Citric Acid ◽  
Nmr Spectra ◽  
Chemical Structure ◽  
Accurate Determination ◽  
Pharmaceutical Formulations ◽  
Two Dimensional ◽  
One Dimensional ◽  
Fluorescent Method ◽  
Derivatizing Agent

Herein, a novel fluorescent method for the determination of d-panthenol (DP) level in solutions with no separate hydrolysis step has been revealed based on the utilization of citric acid (CA) as a derivatizing agent. Consequently, the essential parameters of the derivatization process were established, resulting in the development of sensitive, repeatable, and accurate determination of panthenol. The method was approved, and its usefulness in characterizing the concentration of DP in pharmaceutical formulations and selectivity in the determination of DP were validated. The chemical structure of the new fluorophore formulating in the reaction in DP with CA, i.e., 6-oxo-3,4-dihydro-2H,6H-pyrido[2,1-b][1,3]oxazine-8-carboxylic acid (ODPC), was elucidated using detailed NMR experiments: one-dimensional (1H, 13C) as well as two-dimensional NMR spectra (1H-1H COSY, 1H-13C HSQC, 1H-13C HMBC, 1H-15N HSQC, 1H-15N HMBC).

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