Pyridinium Complexes. IV. The Effect of N-Substituents on the Position of the Iodide Charge-transfer Band

Edward M. Kosower, K. Wallenfels, Dieter Hofmann

Research output: Contribution to journalArticlepeer-review

Abstract

The positions of the iodide charge-transfer bands for a series of substituted l-X-benzyl-4-carbomethoxypyridinium ions in cis-l, 2-dichloroethylene are shown to be correlated by the equation ET/2.303RT = ρ3σ in which σ is the Hammett constant and ρ3, is a sensitivity parameter comparable to the usual ρ. In the present case, ρ3 = — 1.70, consistent with the large effect of substitution expected for a charge-transfer band. It is suggested that an intramolecular charge-transfer band (i.c.t.) is observed as a shoulder at 3090 Å. in solutions of l-(4-methoxybenzyl)-4-carbomethoxypyridinium ion (as the perchlorate).

Original languageEnglish
Pages (from-to)2755-2757
Number of pages3
JournalJournal of the American Chemical Society
Volume84
Issue number14
DOIs
StatePublished - 1962
Externally publishedYes

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