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Nuclear Magnetic Resonance Studies of Some Sodium Ion Complexes with Crown Ethers and <2>Cryptands in Various Solvents
Sodium-23 and carbon-13 NMR were used to study sodium ion complexes with crown ethers 15C5, B15C5, and 18C6 as well cryptands C211, C221, C222, and C222B in water and in a number of nonaqueous solvents.The stabilities of the complexes varied in the order Na+*18C6 > Na+*15C5 > Na+*B15C5.In most cases the cationic exchange between the free and complexed sites was rapid.However, in the NaBPh4 – 18C6 – THF and NaBPh4 – 18C6 – dioxolane systems the exchange was slow enough to observe two 23Na resonances in solutions containing an excess of the sodium salt.Two signals merged when NaBPh4 was replaced by NaClO4 or NaI.In all solvents studied the four cryptands formed stable complexes with the sodium ion.The limiting chemical shifts showed some solvent dependence in the 30 to -70 deg C temperature range.The chemical shift of the complexed sodium ion moved downfield in the order Na+*C222 < Na+*C222B < Na+*C221 < Na+*C211. If you are interested in 14098-44-3, you can contact me at any time and look forward to more communication.Related Products of 14098-44-3
Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare