NMR study of the stoichiometry, stability, and exchange kinetics of alkaline earth complexes with 18-crown-6 in some nonaqueous solutions

1991 ◽  
Vol 95 (23) ◽  
pp. 9601-9604 ◽  
Author(s):  
Mohammad Kazem Amini ◽  
Mojtaba Shamsipur
Keyword(s):  
Alkaline Earth ◽  
Nonaqueous Solutions ◽  
Nmr Study ◽  
Exchange Kinetics ◽  
Kinetics Of

A NMR Study of the Exchange Kinetics of the Nonamethylimidodiphosphoramide with its Complexes of Diamagnetic Cations

1978 ◽  
Vol 33 (6) ◽  
pp. 684-685 ◽  
Author(s):  
P. R. Rubini ◽  
L. Rodehüser ◽  
J.-J. Delpuech
Keyword(s):  
Nmr Spectroscopy ◽  
Ligand Exchange ◽  
H Nmr ◽  
Nmr Study ◽  
Exchange Kinetics ◽  
Monodentate Ligands ◽  
Kinetics Of

Abstract The ligand exchange on nonamethylimidodiphosphoramide (NIPA) complexes is found to be very slow comparatively to analogous monodentate ligands; the rates determined by 1H or 31P NMR spectroscopy are: k(25°C)=4.3 × 10-2 s-1; 31.6 s-1 • M-1; 3.7 × 104 S-1 • M-1 and 1.35 × 104 s-1 · M-1 for Mg2+, Ca2+, Sr2+ and Li+ cations respectively. For the Al3+, Ga3+, In3+ and Be2+ ions no exchange could be detected by 1H NMR spectroscopy up to 120 °C, indicating rates lower than about 10-3 s-1

NMR study of the exchange kinetics of the sodium ion with some 18-crowns in tetrahydrofuran solutions

1987 ◽  
Vol 91 (5) ◽  
pp. 1252-1255 ◽  
Author(s):  
Patrice. Szczygiel ◽  
Mojtaba. Shamsipur ◽  
Klaas. Hallenga ◽  
Alexander I. Popov
Keyword(s):  
Sodium Ion ◽  
Nmr Study ◽  
Exchange Kinetics ◽  
Kinetics Of
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