15N NMR spectroscopy 24—chemical shifts and coupling constants of α-amino acidN-carboxyanhydrides and related heterocycles

1980 ◽  
Vol 14 (3) ◽  
pp. 198-203 ◽  
Author(s):  
Hans R. Kricheldorf
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
15N Nmr ◽  
15N Nmr Spectroscopy

Some Applications of Ultrahigh Resolution 15N NMR Spectroscopy

1998 ◽  
Vol 53 (4) ◽  
pp. 411-415 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Ēriks Kupče
Keyword(s):  
Nmr Spectroscopy ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Absolute Magnitude ◽  
Natural Abundance ◽  
Coupling Constants ◽  
15N Nmr ◽  
Ultrahigh Resolution ◽  
Tert Butyl ◽  
15N Nmr Spectroscopy

Abstract Ultrahigh resolution 15N NMR spectra were measured for two nitroalkanes (MeNO2 la, tBuNO2 1c), two isocyanates (tBuNCO 2c, Me3SiNCO 2d), four isothiocyanates (MeNCS 3a, EtNCS 3b, tBuNCS 3c, Me3SiNCS 3d), one carbodiimide (Me3SiNCNSiMe3 4d), one keteneimine [Me3SiNCC(SiMe3)2 5d], two sulphinyl imides (tBuNSO 6c, Me3SiNSO 6d), and N-tert-butyl-pyrrole 7c, in order to determine coupling constants J(15N ,I3C) and isotope induced chemical shifts 1∆12/13C (15N) at the natural abundance of the isotopes. The values 1∆12/13C (15N) can be separated into two groups, one dealing with NC single and another one with NC double bonds. In each group (with few exceptions), the values 1∆12/13C (15N) become more negative with a decrease in the absolute magnitude of l1J(l5N ,13C)l. The corresponding values 1∆14/15N (13C) show a sim ilar behaviour. However, N-substituted pyrroles appear to be exceptional in this respect.

Application of Reverse Two-Dimensional 1H{15N} NMR Spectroscopy to the Characterization of Two Inorganic Compounds:

1987 ◽  
Vol 42 (6) ◽  
pp. 703-706 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Klaus Schamel ◽  
Karlheinz Guldner ◽  
Max Herberhold
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shifts ◽  
Inorganic Compounds ◽  
Ring System ◽  
Coupling Constants ◽  
15N Nmr ◽  
Two Dimensional ◽  
Hydrogen Atoms ◽  
15N Nmr Spectroscopy

AbstractThe inorganic ring system linked to the [Cr(CO)5] fragment [R = tBu (1), NH2 (2)], has been studied by reverse two-dimensional, 2D, 1H{15N} NMR spectroscopy. In solution, the exchange of the N-H hydrogen atoms is slow on the NMR time scale. Chemical shifts δ(1H), δ(13C), δ(31P), δ(15N) and coupling constants 1J(31P1H), 2J(31P13C), 1J(31P15N) are reported. In the case of 2, the reduced coupling constants 2K(31PN1H) and 1K(31P15N) have the same sign.

scholarly journals 15N—NMR-Spektroskopie bei Stickstoffwasserstoffsäure und Chlorazid / 15N NMR Spectroscopy at Hydrazoic Acid and Chlorine Azide

1978 ◽  
Vol 33 (9) ◽  
pp. 993-996 ◽  
Author(s):  
Joachim Müller
Keyword(s):  
Nmr Spectroscopy ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
15N Nmr ◽  
Hydrazoic Acid ◽  
15N Nmr Spectroscopy

The 15N NMR spectra of HN3 and CIN3 solutions were recorded under triply labelled conditions. The chemical shifts and coupling constants are discussed with respect to the structure and in relation to other isoelectronic compounds.

14N- und 15N-NMR-Spektroskopie von Diazaphospholen und die lineare Korrelation der chemischen Verschiebung von zweifach koordiniertem N und P / 14N and 15N NMR Spectroscopy of Diazaphospholes and the Linear Correlation of the Chemical Shift of Two-Coordinate N and P

1986 ◽  
Vol 41 (5) ◽  
pp. 553-559 ◽  
Author(s):  
Alfred Schmidpeter ◽  
Bernd Wrackmeyer
Keyword(s):  
Linear Correlation ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
15N Nmr ◽  
Ground State Structure ◽  
Nitrogen And Phosphorus ◽  
System A ◽  
Nmr Study ◽  
15N Nmr Spectroscopy ◽  
Scalar Relaxation

A systematic natural abundance 15N NMR study of diazaphospholes is presented for the first time, giving accurate values for chemical shifts, δN , and coupling constants J(31P15N), J(15N1H ). 14N NMR spectra can be used to predict the magnitude of 1J( 31P14N) if the broadening of the 31P resonance by scalar relaxation is known. The relaxation behaviour of the 14N nuclei corresponds to that found in azoles indicating a comparable electronic ground state structure. The comparison of the chemical shifts, δN, in the diazaphospholes with δN of corresponding triazoles reveals differences which can be traced to the N-P σ-bonds and to the influence o f the phosphorus atom on the π-system. A linear correlation δN/δP exists coordinate nitrogen and phosphorus, respectively.

15N NMR spectroscopy unambiguously establishes the coordination mode of the diimine linker 2-(2′-pyridyl)pyrimidine-4-carboxylic acid (cppH) in Ru(ii) complexes

2015 ◽  
Vol 44 (35) ◽  
pp. 15671-15682 ◽  
Author(s):  
Federica Battistin ◽  
Gabriele Balducci ◽  
Nicola Demitri ◽  
Elisabetta Iengo ◽  
Barbara Milani ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Carboxylic Acid ◽  
Coordination Mode ◽  
Chemical Shifts ◽  
Natural Abundance ◽  
15N Nmr ◽  
Nmr Chemical Shifts ◽  
15N Nmr Spectroscopy ◽  
N Natural Abundance

The 15N NMR chemical shifts, obtained through {1H,15N}-HMBC spectra at 15N natural abundance, unambiguously establish the coordination mode of cppH (viaNo or Np) in a series of Ru(ii) compounds.

1H, 13C and 15N NMR Spectra of Coupling Products of Benzenediazonium Salts with Aliphatic Nitro Compounds and Study of Their E/Z Isomerism

1996 ◽  
Vol 61 (4) ◽  
pp. 589-596 ◽  
Author(s):  
Antonín Lyčka
Keyword(s):  
Dimethyl Sulfoxide ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Nitro Compounds ◽  
Coupling Constants ◽  
15N Nmr ◽  
Geometrical Isomers ◽  
Sodium Salts ◽  
Aliphatic Nitro Compounds ◽  
Tautomeric Forms

The 1H, 13C and 15N NMR spectra have been measured of coupling products of benzenediazonium salts with nitromethane, nitroethane, 1-nitropropane, 2-nitroethanol and of their sodium salts, and the chemical shifts have been unambiguously assigned. The coupling products have been found to exist only in their hydrazone tautomeric forms. Stereospecific behaviour of the coupling constants 2J(15N,1H) and 2J(15N,13C) in the 15N isotopomers and NOESY have been used to differentiate between the E and Z geometrical isomers. The above-mentioned compounds exist as Z isomers in deuteriochloroform and predominantly (>95%) as E isomers in dimethyl sulfoxide, while the sodium salts are present only as E isomers in dimethyl sulfoxide.

Synthesis of cyano(selenone)gold(I) complexes and investigation of their scrambling reactions using 13C and 15N NMR spectroscopy

Polyhedron ◽  
2002 ◽  
Vol 21 (21) ◽  
pp. 2099-2105 ◽  
Author(s):  
Saeed Ahmad ◽  
Anvarhusein A. Isab ◽  
Abdul Rahman Al-Arfaj ◽  
Alan P. Arnold
Keyword(s):  
Nmr Spectroscopy ◽  
15N Nmr ◽  
15N Nmr Spectroscopy
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