Hetero-association of caffeine and theophylline with purine and pyrimidine in aqueous solutions studied by1H NMR chemical shift measurements

1989 ◽  
Vol 27 (3) ◽  
pp. 249-252 ◽  
Author(s):  
Ferenc Aradi ◽  
András Földesi
Keyword(s):  
Chemical Shift ◽  
Aqueous Solutions ◽  
Nmr Chemical Shift

NMR Chemical Shift References for Binding Constant Determination in Aqueous Solutions

2001 ◽  
Vol 105 (30) ◽  
pp. 7361-7365 ◽  
Author(s):  
Noriaki Funasaki ◽  
Masao Nomura ◽  
Seiji Ishikawa ◽  
Saburo Neya
Keyword(s):  
Chemical Shift ◽  
Aqueous Solutions ◽  
Binding Constant ◽  
Nmr Chemical Shift ◽  
Constant Determination

A 1H NMR study of cyclodextrin - hydrocarbon surfactant inclusion complexes in aqueous solutions

1998 ◽  
Vol 76 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Lee D Wilson ◽  
Ronald E Verrall
Keyword(s):  
Chemical Shift ◽  
Aqueous Solutions ◽  
Homologous Series ◽  
Binding Constant ◽  
Alkyl Chain ◽  
Binary Solvent ◽  
Nmr Chemical Shift ◽  
H Nmr ◽  
Nmr Study ◽  
Guest Species

A 1H NMR chemical shift ( delta ) study of a homologous series of hydrocarbon (hc) (CxH2x + 1CO2Na, x = 5, 7, 9, 11, 13) surfactants (S) has been carried out in water and in binary solvent (D2O + cyclodextrin (CD)) systems at 22°C. Complementary 1H NMR chemical shift ( delta ) data of the cyclodextrins in binary (D2O + S) systems containing hc surfactants have also been obtained. Complex induced shift (CIS) values for selected host or guest protons were found to increase as the alkyl chain (Cx) length of the surfactant increased. The CIS values are found to depend on the following factors: (i) the magnitude of the binding constant (Ki, i = 1:1, 2:1), (ii) the chain length of the surfactant, (iii) the mole ratio of the host to guest species, (iv) the host-guest stoichiometry, and (v) the host-guest inclusion geometry. The CIS values of the CD-S systems have been analyzed using equilibrium models in which 1:1 complexes, 1:1 plus 2:1 complexes, and uncomplexed species are present. Differences in the binding affinity, stoichiometry, and inclusion geometry of the complexes formed between a given hc surfactant and the various cyclodextrins were observed.Key words: cyclodextrin, surfactant, NMR, chemical shift, complex, binding constant.

Tris(trimethylsilyl)methane as an internal13C NMR chemical shift thermometer

1998 ◽  
Vol 36 (S1) ◽  
pp. S118-S124 ◽  
Author(s):  
William H. Sikorski ◽  
Aaron W. Sanders ◽  
Hans J. Reich
Keyword(s):  
Chemical Shift ◽  
Nmr Chemical Shift

scholarly journals Modeling Small Structural and Environmental Differences in Solids with 15 N NMR Chemical Shift Tensors

ChemPhysChem ◽  
2021 ◽  
Author(s):  
Luther Wang ◽  
Alexander B. Elliott ◽  
Sean D. Moore ◽  
Gregory J. O. Beran ◽  
Joshua D. Hartman ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Nmr Chemical Shift ◽  
Chemical Shift Tensors
Sign in / Sign up

Export Citation Format

Share Document