Add time:08/01/2019         Source:sciencedirect.com

The charge transfer (CT) interactions involving the substituted pyridinium ion are of a remarkable biological interest. In particular the pyridinium ions having substituents in position 3 of the heterocyclic ring constitute models for the study of similar, more complex structures.In this paper some spectral characteristics are reported which show such CT interactions between N-methyl-2-, -3-, -4-metoxypyridinium ions and iodide ions, and between N-methyl-2-, -3-, -4-tiomethylpyridinium ions and iodide and tri-iodide ions. The pyridinium ions substituted in position 3 turned out to be the strongest electron-acceptors.The 1H N.M.R. investigations concerning the N+-CH2 chemical shift confirmed that :I. a substituent of the -OCH3 and -SCH3 type in the pyridine ring causes a rise in the negative charge on the nitrogen in relation to the position in the ring according to the sequence 2 > 4 > 3 ;2. the substitution of the -O-CH3 group with the -S-CH3 group seems to modify the nitrogen charge-density only when the substitution takes place in position 2.

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