scholarly journals Nuclear magnetic resonance (NMR) spectroscopy of inclusion compounds of tolbutamide and chlorpropamide with .BETA.-cyclodextrin in aqueous solution.

1980 ◽  
Vol 28 (5) ◽  
pp. 1415-1421 ◽  
Author(s):  
HARUHISA UEDA ◽  
TSUNEJI NAGAI
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Inclusion Compounds ◽  
Beta Cyclodextrin ◽  
Nuclear Magnetic

Quantitative Determination of Sodium Dodecatungstosilicate Speciation by 183W Nuclear Magnetic Resonance Spectroscopy

2002 ◽  
Vol 55 (4) ◽  
pp. 281 ◽  
Author(s):  
B. J. Smith ◽  
V. A. Patrick
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
High Concentration ◽  
Ph Range ◽  
Nuclear Magnetic

The speciation and equilibria of sodium dodecatungstosilicate has been determined using 183W nuclear magnetic resonance (NMR) spectroscopy over the pH range 3-13.5. The use of NMR allowed the direct observation of polytungstate anions in aqueous solution and at high concentration (0.5 mol L-1). Using this technique, the speciation of α-[SiW12O40]4-, α-[SiW11O39]8-, α-[NaSiW11O39]7-, α-[H2W12O40]6-, [H8W11O40]6-, [H7W11O40]7-, [W7O24]6-, [H2W12O42]10-, and WO42- was quantified as a function of pH. This work has allowed stability constants for α-[SiW12O40]4- (log K 46) and α-[SiW11O39]8- (log K 86) to be estimated.

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