𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The structure of the ion pairs of the carbanion of indene with alkali metal cations

✍ Scribed by J. van der Kooij; N.H. Velthorst; C. MacLean

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
297 KB
Volume
12
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

NMR specrra have been measured of the Li", Na+ and r;' ion pairs of the indenyl carbanion in 1,2_dimethoxyethane and tetsahydrofuran as a function of temperatzre.

The changes of the chemical shifts are explained in terms of the detailed structure of the ion pairs. The results in both solvents strongly suggest that in indenyl-Lif the counterion is predominantly located over the six-membered ring. In THF the preferred position of the cations Na+ and K+ in the.contact ion pairs seems to be the five-membered ring.

πŸ“œ SIMILAR VOLUMES

The effect of coordination on the optica
The effect of coordination on the optical spectra of alkali metal cation-electron pairs in ethers
✍ W.A. Seddon; J.W. Fletcher; R. Catterall; F.C. Sopchyshyn πŸ“‚ Article πŸ“… 1977 πŸ› Elsevier Science 🌐 English βš– 240 KB

Rccclvcd 20 Deccmbcr 1976 Rcv~rcd rnanusx~p~ rccuivcd 28 hfnrcll 1977 Transient optical absorption bands observed in li)-\* M sodlurn tciraphenylbor<)n solutions m tetmbydrofuran (TIIF), di~~lctbo~ycthanc (DBIC), dlglymc (DC) and tnglymc (TG). with maxima at =900 and 4 1600 nm. are accgncd to tbc fo

The alkali cation effect on the 1H NMR c
The alkali cation effect on the 1H NMR chemical shifts of the indenyl carbanion
✍ C. Gooijer; N. H. Velthorst πŸ“‚ Article πŸ“… 1979 πŸ› John Wiley and Sons 🌐 English βš– 311 KB

## Abstract The complex character of the temperature dependence of the ^1^H NMR chemical shifts of indenyl‐lithium and ‐sodium in dimethoxyethane is explained. It is shown that the cation causes a polarisation of the Cο£ΏH bonds and thus influences the proton shifts of the anion, both directly by its