Nuclear magnetic resonance studies on the structures of some substituted N-alkylpyridinium pentanitratolanthanate ion pairs in solutions

1974 ◽  
Vol 13 (12) ◽  
pp. 2896-2900 ◽  
Author(s):  
M. Saleem. Quereshi ◽  
Ian M. Walker
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Ion Pairs ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Structure of ion-pairs derived from dihydroanthracenes II. Nuclear magnetic resonance studies

1967 ◽  
Vol 301 (1466) ◽  
pp. 231-238 ◽  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Alkyl Group ◽  
Ion Pairs ◽  
Lithium Salts ◽  
Magnetic Resonance Studies ◽  
Planar Configuration ◽  
Nuclear Magnetic

N. m. r. studies of 9, 10-dihydroanthracene, its 10-alkyl substituted derivatives and of the respective Li + salts established the stereochemistry of these compounds. The spectra show that neither the molecules of these hydrocarbons nor of their lithium salts are planar, although in the anions the carbon 9 atoms possess a considerable amount of sp 2 character. The anion of the unsubstituted salt vibrates rapidly through the planar configuration while the substituted anion prefers one conformation, apparently that in which the alkyl group is equatorial. The n. m. r. spectrum of the unsubstituted salt is compared with those of the lithium salts of some similar hydrocarbons, namely, fluorene and diphenylmethane.

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