Coupling constants tabulations

The H NMR spectral properties of pyridazines were surveyed in CHEC-I <84CHEC-l(3B)i>, and chemical shifts and coupling constants tabulated for series of simple (methyl, chloro, and methoxy substituted) pyridazine and pyridazinone derivatives, and for N-oxides. The parent pyridazine in CDCI3 resonates at d 9.24 (3,6-H) and 7.54 (4,5-H) while the 3-H to 6-H resonances for the... 

MHz, solvent CDC13 13C broad band decoupled and 13C gated decoupled spectra Assign all signals and calculate and tabulate coupling constants nJ(P-C) and11J(C-H)... 

N, H) coupling constants lie in the range of (—80 15) Hz. Some examples, including exceptions, are tabulated in Table 13. 7( N, H) coupling constants are generally less than 2 Hz in magnitude ... 

For tabulations of NMR chemical shifts and coupling constants, see F. A. Bovey, NMR Data Tables for Organic Compounds, vol. 1, Interscience, New York, 1967 W. Briigel, Nuclear Magnetic Resonance Spectra and Chemical Structure, vol. 1, Academic Press, New York, 1967. 

Nitrite complexes can be simply prepared by metathetical replacement with nitrite ion.1163 The structure of n-anj-Pt(N02)2 P-(p-tol)3 2 has a Pt—N distance of 2.030(5) A and N—O distances of 1.228(8) A and 1.98(7) A.11 4 Chemical shift (5 Pt) and coupling constant data have been tabulated for a large group of platinum(II) and (IV) nitro complexes. Both chemical shift and coupling constant changes upon ligand substitution are dominated by the nature of the trans ligand/165... 

The one-bond coupling constants Jcc tabulated so far cover a span of 30 to 180 Hz (Table 3.11 (a)). They increase with increasing s character of the hybrid orbitals contributing to the bond between the coupling carbon nuclei. A rough correlation between Jcc and the product Sj s2 of the s characters of the interacting carbon hybrid orbitals (C-l, C-2), i.e. the s bond order of the C-C bond, is observed (Table 3.11 (a) Fig. 3.17). 

Full tabulations of the vibronic coupling constants and tensor operators involved in the calculation of f —> f electronic transitions in centrosymmetric compounds are available and can be requested from R.A. (Documentation I - Appendices 1 and 2), and therefore will not be repeated here. 

Data for a number of platinum (II) phosphine complexes are tabulated in Table II. The coupling constant for the cis isomer is ca. 1.5 times that for the trans isomer. 

The 15CH coupling constants (often obtained from 13C satellites in H NMR spectra) of small heterocycles have been listed <1979MI50101>. A 13C NMR study of 1,2-dimcthyl-3-/W/-butyldiaziridinc showed that the population of the 1,2-cis isomer increases with solvent polarity (see Section 2.5.3.8) <1998MC113>. 13C Chemical shifts for the ring carbons of representative derivatives of dithiiranes , azetidines , diazetidines , thiazetidines , dioxetanes , and 1,2-oxathietane S,A-dioxides (-sultones) have been tabulated. 

The most common approach to the interpretation of EPR and Mossbauer spectra of siderophores is the spin Hamiltonian formalism. The wavefimctions are parameterized in terms of a few coupling constants that arise in the spin Hamiltonian description of the electronic states. In this approach, the crystal field potential is generally described by a series of spherical harmonics. The corresponding operators are tabulated. ... 

Tabulated compilations of the chemical shifts of the protons in oxiranes are frequently found in the literature, " but structural conclusions are rarely drawn from the chemical shifts as the coupling constant is a more exact means of establishing the configuration. Configurations and conformations of oxiranes derived from prostaglandin intermediates have been determined from H shifts with the aid of the ring current model. ... 

The NMR chemical shifts and coupling constants for compounds (13)-(16) are tabulated in Table IX all the spectra were obtained from samples with 99% enrichment. The bent nitrosyl ligands resonate at high field whereas linear groups are found at medium field. It is instructive to compare the NMR data for [RuCl(CO)(NO)(PPh3)2] (15)... 

---