✦ LIBER ✦
Crystal structure of the cryptand [3.33] - potassium iodide complex: A large coordination number for potassium ion
✍ Scribed by N.Kent Dalley; Krzysztof E. Krakowiak; Jerald S. Bradshaw; Mark M. England; Xiaolan Kou; Reed M. Izati
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- French
- Weight
- 474 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0040-4020
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✦ Synopsis
Cryptand [3.3.3]
was prepared by a one-step process from 2 moles of l,l l-diiodo-3,6,9-trioxaundecane and I mole of l,l l-diamino-3,6,9-trioxaundecane in ace&&rile using potassium carbonate as the base. An X-ray crystal study of the KI-[3.3.3] complex shows that all cryptand donor atoms are directed towards the encapsulated K'.
The K' ion is not midway between the two nitrogen atoms, but is 3.15A from one nitrogen and 3.37A from the other.
The X-ray structure strongly suggests that potassium is coordinated by eleven donor atoms.