Carbon-13 NMR Chemical Shifts and Relaxation Times as a Probe of Structural and Dynamic Properties in Alkali and Alkaline Earth Cryptate Complexes

Luis Echegoyen, Angel Kaifer, H. Dupont Durst, George W. Gokel

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The C-13 NMR spectra of cryptands [2.1.1], [2.2.1], and [2.2.2] in the presence of Li+, Na+, K+, Ca2+, and Ba2+ in D2O/MeOH or CDCl3 have been analyzed. Generally, the carbons shifted to higher field upon complexation. Two exceptions to this were observed: the complexes [2.1.1]·Na+ and [2.2.1]·K+. The C-13 longitudinal relaxation time measurements show a surprising increase in magnitude for most alkali-metal, but not alkaline earth metal, complexes. This increase in relaxation times is interpreted in terms of ligand compression, desolvation, and solvent reorganization.

Original languageEnglish (US)
Pages (from-to)688-690
Number of pages3
JournalJournal of Organic Chemistry
Volume49
Issue number4
DOIs
StatePublished - Jun 1984
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry

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