Sign determination of 13C13C coupling constants by sign-labeled polarization transfer

1983 ◽  
Vol 54 (1) ◽  
pp. 122-133 ◽  
Author(s):  
O.W Sørensen ◽  
R.R Ernst
Keyword(s):  
Polarization Transfer ◽  
Coupling Constants ◽  
Sign Determination

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 Sign-Determination of Spin-Spin Coupling Constants in tert-Butylphosphaalkyne

1992 ◽  
Vol 47 (3) ◽  
pp. 437-438
Author(s):  
Bernd Wrackmeyer
Keyword(s):  
Coupling Constants ◽  
Spin Coupling ◽  
Positive Sign ◽  
Two Dimensional ◽  
Tert Butyl ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling ◽  
Sign Determination

The signs o f the coupling constants 1J(31P≡13C) ( > O ) , J(31P13C) ( > O ) , 3J(31P13C) ( > O ) and 4J(31P1H) ( > O ) in tert-butyl-phosphaalkyne (1) were determined by selective 1H {31P} NMR experiments and two-dimensional (2 D ) 13C/1H heteronuclear shift correlations based on nJ(13C1H ) (n = 1,2,3), confirming the previously assumed positive sign of 1J( 31P≡13C) in phosphaalkynes.

Relative sign determination of phosphorus-carbon coupling constants by 2D carbon-13 NMR spectroscopy

1989 ◽  
Vol 8 (2) ◽  
pp. 568-571 ◽  
Author(s):  
Leslie H. Randall ◽  
Andrew A. Cherkas ◽  
Arthur J. Carty
Keyword(s):  
Nmr Spectroscopy ◽  
Coupling Constants ◽  
Relative Sign ◽  
Sign Determination

Determination of long-range scalar 1H–1H coupling constants responsible for polarization transfer in SABRE

2016 ◽  
Vol 265 ◽  
pp. 59-66 ◽  
Author(s):  
Nan Eshuis ◽  
Ruud L.E.G. Aspers ◽  
Bram J.A. van Weerdenburg ◽  
Martin C. Feiters ◽  
Floris P.J.T. Rutjes ◽  
...  
Keyword(s):  
Long Range ◽  
Polarization Transfer ◽  
Coupling Constants
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