Nitrogen spin coupling constants

Table 7.66 Nitrogen-15 to Hydrogen-1 Spin Coupling Constants 7.115...

Table 7.67 Nitrogen-15 to Carbon-13 Spin Coupling Constants 7.116...

TABLE 7.68 Nitrogen- 15 to Fluorine-19 Spin Coupling Constants... 

The electron spin resonance of the nitroxalkylcorrinoids can be readily observed in aqueous solution at room temperature. Both the cobalamin and cobinamide show nitrogen hyperfine coupling constants of 17.2 gauss. A typical spectrum is shown in Fig. 20. The line widths for the low, intermediate, and high field peaks are 1.87, 1.87, and 2.20... 

Crepaux, D., Lehn, J. M. Nuclear Spin-Spin Interactions Part IX. Relative Signs of the Geminal Nitrogen-Hydrogen Coupling Constants for Doubly Bonded Nitrogen. Mol. 

The intimate relationship between NMR parameters such as chemical shifts and spin-spin coupling constants and molecular geometry is particularly evident for derivatives with rigid frameworks. Therefore, structural and conformational effects are treated first as a separate topic and then in conjunction with specific compounds. As data on hydroxylamines, oximes and hydroxamic acids are not as extensive as those for other types of systems containing nitrogen or oxygen, comparisons with their respective parameters or effects have also been included wherever they are considered relevant. 

An extensive analysis of the effect of lone pairs on the nitrogen atom on spin-spin coupling constants is reviewed in the context of a description of molecular electronic structure. Several oximes are analyzed in studies of these effects and their relevance for structural determination has been pointed out. 

Kupce, E., Liepins, E., Pudova, O., and Lukevics, E., Indirect nuclear spin-spin coupling constants of nitrogen-15 to silicon-29 in silylamines, J. Chem. Soc. Chem. Commun., 581, 1984. 

DelBene, J.E. and Bartlett, R.J., N-N spin-spin coupling constants [2hJ(15N-15N)] across N-H N hydrogen bonds in neutral complexes to what extent does the bonding at the nitrogens influence 2hJN-N communication, J. Am. Chem. Soc., 122, 10480 2000. 

Fig. 3. First derivative electron spin resonance spectra. (A) ESR spectrum of an unpaired electron. (B) ESR spectrum of an unpaired electron interacting with a nitroxide resulting in a nitrogen hyperfine coupling constant aN. (C) ESR spectrum of an unpaired electron interacting with a H nucleus and a l4N nucleus as is typical for PBN radical adducts. (D) ESR spectrum of an unpaired electron interacting with the l3C nucleus, the H nucleus and the 14N nucleus of the trichloromethyl radical adduct of PBN, where the carbon tetrachloride was labeled with 13C.

Soper, P.D., Fegon, A.C., Read, W.G., and Flygare, W.H. (1982) The microwave rotational spectrum, molecular geometry,14N nuclear quadrupole coupling constants, and H-1S>F nuclear spin-nuclear spin coupling constant of the nitrogen-hydrogen fluoride dimer. J. Chem. Phys., 76, 292-300. 

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