73Ge, 119Sn and 207Pb: general cooperative effects of single atom ligands on the NMR signals observed in tetrahedral [MXnY4−n] (M = Ge, Sn, Pb; 1 ≤ n ≤ 4; X, Y = Cl, Br, I) coordination compounds of heavier XIV group elements

2017 ◽  
Vol 46 (9) ◽  
pp. 2855-2860 ◽  
Author(s):  
M. Benedetti ◽  
F. De Castro ◽  
F. P. Fanizzi
Keyword(s):  
Linear Relationship ◽  
Coordination Compounds ◽  
Chemical Shifts ◽  
Single Atom ◽  
Ionic Radii ◽  
Nmr Chemical Shifts ◽  
Cooperative Effects ◽  
Nmr Signals

An inverse linear relationship between 73Ge, 119Sn and 207Pb NMR chemical shifts and the sum of ionic radii of coordinated halides has been found in [MXnYm] (M = Ge, Sn, Pb; n + m = 4; X, Y = Cl, Br, I) compounds.

scholarly journals General cooperative effects of single atom ligands on a metal: a195Pt NMR chemical shift as a function of coordinated halido ligands’ ionic radii overall sum

2015 ◽  
Vol 44 (35) ◽  
pp. 15377-15381 ◽  
Author(s):  
M. Benedetti ◽  
F. de Castro ◽  
D. Antonucci ◽  
P. Papadia ◽  
F. P. Fanizzi
Keyword(s):  
Chemical Shift ◽  
Linear Relationship ◽  
Single Atom ◽  
Nmr Chemical Shift ◽  
Ionic Radii ◽  
Cooperative Effects ◽  
Nmr Signals

An inverse linear relationship between the experimentally observed195Pt NMR signals and the overall sum of coordinated halido X ligands’ ionic radii was discovered in Pt(ii) and Pt(iv) complexes.

33S NMR spectra of some sulfonated naphthalenes, naphthols, and their anions

1990 ◽  
Vol 55 (2) ◽  
pp. 446-451 ◽  
Author(s):  
Josef Jirman ◽  
Antonín Lyčka
Keyword(s):  
Aqueous Solutions ◽  
Ammonium Sulfate ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Hydroxyl Group ◽  
Upfield Shift ◽  
Sulfonic Group ◽  
Nmr Chemical Shifts ◽  
Downfield Shift ◽  
Nmr Signals

The 33S NMR spectra of 11 naphthalenesulfonates, 11 hydroxynaphthalenesulfonates, two dihydroxynaphthalenesulfonates, and their anions have been measured in aqueous solutions. The 33S NMR chemical shifts of these compounds exhibit upfield shifts when related to ammonium sulfate as the standard. Introduction of a further sulfonic group causes a small upfield shift (up to 3 ppm). Introduction of a hydroxyl group causes a downfield shift (up to 5 ppm) unless the ring is further substituted. Formation of the anion from hydroxyl group causes an additional downfield shift (up to 6 ppm). The half-width of 33S NMR signals of sulfonated naphthalenes, naphthols, and their anions vary from 10 to 400 Hz.

NMR effective radius of hydrogen in XIV group hydrides evaluated by NMR spectroscopy

2017 ◽  
Vol 46 (41) ◽  
pp. 14094-14097 ◽  
Author(s):  
M. Benedetti ◽  
F. De Castro ◽  
A. Ciccarese ◽  
F. P. Fanizzi
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Chemical Shifts ◽  
Effective Radius ◽  
Nmr Chemical Shift ◽  
Ionic Radii ◽  
Nmr Chemical Shifts

In the [ABrnIm] (A = C, Si, Ge, Sn; n + m = 4) compounds, with the heavier halido ligands bonded to the central IV group elements, the 13C, 29Si, 73Ge and 119Sn NMR chemical shifts were found to be linearly related to the bonded halides ionic radii overall sum, ∑(rh). The 207Pb NMR chemical shift of the unstable [PbH4] hydride could be calculated.

Linear Relationship between 13 C NMR Chemical Shifts and the Bending of sp‐Carbon Chains

2019 ◽  
Vol 25 (55) ◽  
pp. 12689-12693 ◽  
Author(s):  
Mathis Kreuzahler ◽  
Abdulselam Adam ◽  
Gebhard Haberhauer
Keyword(s):  
Linear Relationship ◽  
Chemical Shifts ◽  
Nmr Chemical Shifts ◽  
Carbon Chains ◽  
C Nmr

Relativistic and Dynamic effects are needed to correctly model the 1H NMR Chemical Shifts of an Iridium Polyhydride Cluster

2020 ◽  
Author(s):  
Abril C. Castro ◽  
David Balcells ◽  
Michal Repisky ◽  
Trygve Helgaker ◽  
Michele Cascella
Keyword(s):  
1H Nmr ◽  
Chemical Shifts ◽  
Dynamic Effects ◽  
Nmr Chemical Shifts

Carbon-13 and nitrogen-14 NMR spectra of 1-(substituted phenyl)pyridinium salts

1980 ◽  
Vol 45 (10) ◽  
pp. 2766-2771 ◽  
Author(s):  
Antonín Lyčka
Keyword(s):  
Heavy Water ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Pyridinium Salts ◽  
Nmr Signals ◽  
C Nmr

The 13C and 14N NMR spectra of 1M solutions of 1-(substituted phenyl)pyridinium salts (4-CH3, 4-OCH3, H, 4-Cl, 4-Br, 4-I, 3-NO2, 4-NO2, 2,4-(NO2)2 (the 13C NMR only)) have been measured in heavy water at 30 °C. The 13C and 14N chemical shifts, the 1J(CH) coupling constants, some 3J(CH) coupling constants, and values of half-widths Δ 1/2 of the 14N NMR signals are given. The 13C chemical shifts of C(4) correlate with the σ0 constants (δC(4) = (1.79 ± 0.097) σ0 + (147.67 ± 0.041)), whereas no correlation of the nitrogen chemical shifts with the σ constants has been found. The half-widths Δ 1/2 correlate with the σ0 constants (Δ 1/2 = (76.2 ± 4.9) σ0 + (106.4 ± 2.2)) except for 1-phenylpyridinium chloride.

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