Nitrogen-14 nuclear magnetic resonance determination of the quadrupole coupling constants of methyl isocyanide and ethyl isocyanide

1969 ◽  
Vol 73 (12) ◽  
pp. 4145-4147 ◽  
Author(s):  
William B. Moniz ◽  
C. F. Poranski
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coupling Constants ◽  
Quadrupole Coupling ◽  
Methyl Isocyanide ◽  
Nuclear Magnetic

A Comparative Nuclear Magnetic Resonance Study of the Solvation of CuClO4 in Binary Mixtures of Acetonitrile with Pyridine and Picolines at 298K

2012 ◽  
Vol 67 (5) ◽  
pp. 303-307 ◽  
Author(s):  
Dip Singh Gill ◽  
Dilbag Singh Rana ◽  
Mohinder Singh Chauhan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Binary Mixtures ◽  
Nuclear Magnetic Resonance Study ◽  
Coupling Constants ◽  
Mixed Complex ◽  
Magnetic Resonance Study ◽  
Quadrupole Coupling ◽  
Ubbelohde Viscometer ◽  
Nuclear Magnetic

63Cu nuclear magnetic resonance (NMR) and viscosity studies of 0:064M CuClO4 solutions have been reported in binary mixtures of acetonitrile (AN) with pyridine (Py) and 2, 3, and 4-picolines (2,3,4-Pic) at 298 K using a Bruker 500 MHz NMR spectrometer and an Ubbelohde viscometer, respectively. Chemical shift d and linewidth D for the 63Cu signals have been recorded referenced to a 0:064M CuClO4 solution in anhydrous AN. The copper quadrupole coupling constants (e2Qq=h) have been calculated in all cases. The variation of the d and e2Qq=h values as a function of mol fraction of the co-solvent show that all these bases interact with Cu+ more strongly than AN. They replace AN from the Cu+ complexed with AN in the form [Cu(AN)4]+ and form a mixed complex of the type [Cu(AN)4-x(S)x]+ (x=1 - 4) where S stands for the base. At relatively high mole fraction of the co-solvents, the mixed solvated complex gradually changes to a more symmetrical complex of the type [Cu(S)4]+ which remains stable in the solution. The solvating effect of 2-Pic and 4-Pic is observed to be stronger than that of Py and 3-Pic.

Quadrupoleffekte der magnetischen Kernresonanz an 11B in Bor-Stickstoffverbindungen

1969 ◽  
Vol 24 (4) ◽  
pp. 566-572 ◽  
Author(s):  
Klaus Wiedemann ◽  
Jürgen Voitländer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Quadrupole Interaction ◽  
Second Order ◽  
Coupling Constants ◽  
Quadrupole Coupling ◽  
Wide Line ◽  
Nuclear Quadrupole ◽  
Asymmetry Parameters ◽  
Nuclear Magnetic

Abstract First and second-order quadrupole effects of the 11B nuclear magnetic resonance have been measured in polycrystalline samples of dimere dimethylaminoboranes and tetramethylboracene. With the theory of powder patterns for first and second-order quadrupole interaction the nuclear quadrupole coupling constants e2 q Q/h and asymmetry parameters η of 11B have been determined. For these measurements boron-free inserts had to be constructed for the probes of the Varian Wide Line Spectrometer DA 60.

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