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NMR studies on ion pairing in solution

✍ Scribed by Elena Borghi

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
225 KB
Volume
40
Category
Article
ISSN
0020-1693

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✦ Synopsis

racemization, they can, in principle, be isolated as free ligands at room temperature.

Two isomeric forms I and II of the 11 8]aneP402 ligand have been isolated and their nickel(H) tetrafluoborate derivatives have been synthesized and characterized. Conductometric, magnetic and spectroscopic measurements indicate that the latter compounds contain square planar (Ni(l181aneP402)}2+ cations, the nickel(H) ion being coordinated to the four phosphorus atoms. The 31P NMR spectrum of isomer I is reported in Fig. 2 and shows a pattern of

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23Na. 85Rb and 87Rb NMR experiments prove the existence of positive and negative spin densities at alkali metal nuclei in alkali-aromatic radical ion pairs. Line-width measurements show that the \<\*idth of the 85Rb NMR line is determined bsr quadrupolar relaxation, while for 8711b and 23Na also dip