Eine neue quantitative Beschreibung der Abstandsabhängigkeit von <sup>19</sup>F‐<sup>19</sup>F‐Spin‐Spin‐Kopplungen durch den Raum

Ernst, Ludger; Ibrom, Kerstin

doi:10.1002/ange.19951071715

Cited by 21 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A rigid scaffold that is used to achieve such spatial proximity is the naphthalene framework, in which substituents in the peri (1,8) positions have a typical separation of around 3 Å 4. Through‐space J ( 19 F, 19 F) SSCCs, long known for their distance dependence,5a have been studied in some detail in peri ‐difluoronaphthalenes 5b,c. Similarly, J ( 31 P, 31 P) values in peri ‐bis(phosphino)naphthalenes have been attributed to through‐space coupling,6 and J ( 77 Se, 77 Se) values in peri ‐bis(seleno) derivatives have been analyzed in detail through quantum‐chemical computations 7.…”

Section: Methodsmentioning

confidence: 99%

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

et al. 2013

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

et al. 2013

View full text Add to dashboard Cite

show abstract

“…4 The J(F,F) value in to-2F 2 is very much smaller than in the tg-isomer, only 0.6 Hz. No resolvable 19F,19F coupling is observed in the 13C satellites of the 19F resonance of In view of the tm-2F 2 .…”

Section: Monoñuorodithia [ 33 ] Paracyclophane 3fmentioning

confidence: 90%

1H,13C and19F NMR study ofar,ar′-difluoro[2.2]paracyclophanes,ar,ar′-difluoro-2,11-dithia[3.3]paracyclophanes and their monofluoro analogues. Long-range19F,19F spin-spin coupling

Ernst

Ibrom

1997

Magn. Reson. Chem.

Self Cite

View full text Add to dashboard Cite

The four isomeric difluoro‐2,11‐dithia[3.3]paracyclophanes, 3F2, with one fluorine substituent per aromatic ring were prepared as a 1:1:1:1 mixture. They were converted into the bissulphones, which were pyrolysed to yield the ar,ar′‐difluoro[2.2]paracyclophanes, 2F2, as a mixture of pseudogeminal, pseudoortho‐, pseudometa‐ and pseudopara‐isomers in a ratio of 1:2:3:2. The 1H, 13C and 19F NMR spectra of the mixture of starting materials, 3F2, and of the mixture of products, 2F2, were analyzed by the use of two‐dimensional shift correlations (1H,1H‐COSY, 13C,1H‐ and 19F,1H‐HETCOR) and by comparing the experimental 1H and 13C chemical shifts with those predicted by assuming additivity of substituent chemical shifts (SCS). The SCS values were derived from the spectra of the monofluoro compounds, 2F and 3F. Large through‐space 19F,19F coupling constants were observed for the pseudogeminal isomers of 2F2 (13.7 Hz) and 3F2 (7.2 Hz). Smaller J(F,F) values were found for the pseudoortho‐ (0.6 Hz) and, surprisingly, for the pseudopara‐isomer (2.8 Hz) of 2F2. The latter coupling is probably transmitted through the π‐electron system(s) of the [2.2]paracyclophane deck. A number of through‐space J(F,C) and J(F,H) couplings were also observed. © 1997 John Wiley & Sons, Ltd.

show abstract

“…In this group the spin system is very simple: The coupling between the fluorine atoms in position on the distance between the interacting nuclei [4] . A detailed 2 and 4, and between those in 4 and 6, is usually less than although in some cases they overlap with Ph peaks.…”

Section: Introductionmentioning

confidence: 99%

The 3,5-Dichlorotrifluorophenyl Ligand, a Useful Tool for the Study of Coordination Modes and Dynamic Behavior of Complexes of Palladium and Platinum

Alonso

Casares

Espinet³

et al. 1998

Eur. J. Inorg. Chem.

View full text Add to dashboard Cite

The square‐planar complexes [MR2L2] (M = Pd, Pt; R = 3,5‐C6Cl2F3) [L2 = OPPyPh2 (Py = 2‐pyridyl); SPPyPh2; OPPy2Ph; DMBI (3,3′‐dimethyl‐2,2′‐biindazole); OPPyPh(NHTol‐p); p‐TolNPPy2Ph] have been prepared by treating cis‐[MR2(THF)2] (THF = tetrahydrofuran) with the appropriate chelate ligands. The 19F‐NMR spectra of these complexes show the presence of intramolecular through‐space F‐F couplings between ortho‐fluorine atoms of nonequivalent R groups, which provide information for the assignment of the different ortho‐fluorine signals and can be used to study the dynamic behavior of the mentioned complexes such as: a) Rotation of the R group in either Pd or Pt complexes, at the same or at different rates for each R groups depending on the neutral ligand; and b) exchange of the coordination sites of the chelating ligand, either by Berry or by turnstile mechanisms. The activation parameters for some of the processes are given.

show abstract

Eine neue quantitative Beschreibung der Abstandsabhängigkeit von ¹⁹F‐¹⁹F‐Spin‐Spin‐Kopplungen durch den Raum

Abstract: ZUSCHRIFTENDiese Planaritit ist durch die Molekulstruktur der entsprechenden acyclischen Stritktureinheit belegl [I]. Die gleiche Halbsessel-Ringstrukt tir hat das isoelektronische S,N,: R. W. H. Small. A.

Cited by 21 publications

References 23 publications

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

1H,13C and19F NMR study ofar,ar′-difluoro[2.2]paracyclophanes,ar,ar′-difluoro-2,11-dithia[3.3]paracyclophanes and their monofluoro analogues. Long-range19F,19F spin-spin coupling

The 3,5-Dichlorotrifluorophenyl Ligand, a Useful Tool for the Study of Coordination Modes and Dynamic Behavior of Complexes of Palladium and Platinum

Contact Info

Product

Resources

About

Eine neue quantitative Beschreibung der Abstandsabhängigkeit von 19F‐19F‐Spin‐Spin‐Kopplungen durch den Raum

Abstract: ZUSCHRIFTENDiese Planaritit ist durch die Molekulstruktur der entsprechenden acyclischen Stritktureinheit belegl [I]. Die gleiche Halbsessel-Ringstrukt tir hat das isoelektronische S,N,: R. W. H. Small. A.

Cited by 21 publications

References 23 publications

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

Weak Te,Te Interactions through the Looking Glass of NMR Spin–Spin Coupling

1H,13C and19F NMR study ofar,ar′-difluoro[2.2]paracyclophanes,ar,ar′-difluoro-2,11-dithia[3.3]paracyclophanes and their monofluoro analogues. Long-range19F,19F spin-spin coupling

The 3,5-Dichlorotrifluorophenyl Ligand, a Useful Tool for the Study of Coordination Modes and Dynamic Behavior of Complexes of Palladium and Platinum

Contact Info

Product

Resources

About

Eine neue quantitative Beschreibung der Abstandsabhängigkeit von ¹⁹F‐¹⁹F‐Spin‐Spin‐Kopplungen durch den Raum