Line widths, sensitivity and artifacts in33S NMR Spectra: The case of aqueous sulphides

125Te nmr spectra of a number of organotellurium compounds and inorganic tellurium salts are reported. The tellurium shielding has been found to be dependent upon the nature and number of electronegative substituents bonded to tellurium and where applicable, upon the para substituents on the phenyl ring. Possible reasons for the observed broad line widths are discussed.

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Effects of Acid on Line Widths in the Proton NMR Spectra of Porphyrins Not Substituted at themeso-Positions

The Journal of Physical Chemistry A ◽

10.1021/jp972783p ◽

1997 ◽

Vol 101 (51) ◽

pp. 9948-9953 ◽

Cited By ~ 3

Author(s):

Abolfazl Seyed Sadjadi ◽

Robert I. Walter ◽

John S. Harwood

Keyword(s):

Nmr Spectra ◽

Proton Nmr ◽

On Line ◽

Line Widths

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Nuclear Quadrupole Perturbations in 51V NMR Spectra of Oxovanadium(+V) Complexes

Zeitschrift für Naturforschung A ◽

10.1515/zna-1982-0207 ◽

1982 ◽

Vol 37 (2) ◽

pp. 139-149 ◽

Cited By ~ 14

Author(s):

Kurt Paulsen ◽

Dieter Rehder

Keyword(s):

Asymmetry Parameter ◽

Nmr Spectra ◽

Electric Quadrupole ◽

Coupling Constants ◽

Concentration Effects ◽

Quadrupole Coupling ◽

Line Widths ◽

Nuclear Quadrupole ◽

Nmr Signals ◽

Temperature And Concentration Effects

Abstract Nuclear electric quadrupole coupling constants e2qQ/h have been obtained by evaluation of quadrupole perturbations in 51V NMR spectra of various vanadyl esters and esterchlorides of the general formula VOCl3-n(OR)n (n=0-3; R = Me, Prn , Prn, Bun and Bui). e2qQ/h values have been calculated from (i) 2nd. order quadrupole splittings of the 51V NMR signals in pseudo-polycrastalline samples, (ii) 1st. order quadrupole splittings in nematic liquid crystals and (iii) line widths A ⊿ν1/2 of the 51V and 35Cl NMR signals in the liquid isotropic state and e2qQ/h(35Cl) obtained by pure NQR measurements. The influences of the asymmetry parameter η and the orientation of the crystallites in powder spectra are considered, and temperature and concentration effects upon ⊿ν1/2 and 51V shielding (isotropic phases) and the ordering factor Sa (meso-phases) are discussed.

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The 51V NMR Spectra of Some Oxo-, Peroxo-, Nitrosyl- and Hydroxylamidovanadium Complexes

Zeitschrift für Naturforschung B ◽

10.1515/znb-1981-1012 ◽

1981 ◽

Vol 36 (10) ◽

pp. 1251-1254 ◽

Cited By ~ 13

Author(s):

Dieter Rehder ◽

Karl Wieghardt

Keyword(s):

Correlation Time ◽

Nmr Spectra ◽

Dinuclear Complexes ◽

Chelate Complexes ◽

Factors Associated ◽

51V Nmr ◽

Molecular Correlation ◽

Steric Factors ◽

Line Widths ◽

Nmr Signals

Abstract The 51V NMR spectra are recorded for 3 dinuclear complexes {VO(ONR2)2μ - O and 13 mononuclear vanadium (+ V) and (+III) chelate complexes of the general formula [VXYZ]q, where X = O2-, NO-; Y = O2-, O22-, R2NO-; and Z = picolinate-(pic), dipicolinate2- (dipic), nitrilo-tri(2-propanolate)3-, and o-phenanthroline (phen). Shielding of the 51V nucleus increases as O2- is replaced for NO-, and in the series (O2- + dipic) < (2 O22- + pic) < (R2NO- + dipic) < (2 H2NO- + phen) < (2 H2NO- + pic); Et2NO- < H(Me)NO- < H2NO-; and (dinuclear complexes) C5H10NO- < Bz2NO- < Et2NO- These trends are explained on the basis of variations of molecular parameters correlated to electronic and steric factors associated with the ligands. Line widths of the 51V NMR signals are discussed in terms of influences originating from variations of the electric field gradient and the molecular correlation time

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