Etude du transfert d'énergie en milieu liquide à 1'aide du coupage de la scintillation
✍ Scribed by Maurice Cosandey; Pierre Lerch
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- German
- Weight
- 513 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
A five-or six-membered ring in pentacyclic azo-dyestuff-chromium complexes with the sandwich arrangement, having sulphonamido groups as complex formers, was extended into a nine-membered ring. This altered not only the electron spectrum but also the stability of the complex. Whilst the five-and six-membered pentacycles are very stable, the corresponding nine-membered ring complex is considerably less stable. Its stability approaches that of the corresponding 1 :2-Cr complexes which, because of deformed valency angles, are very strained and, therefore, are also very unstable. This tension is counteracted in pentacycles having a lower number of members (5 and 6), and so the system is stabilised. If the number of ring members is increased, this counteraction is reduced and, therefore, the stabilising effect is lessened.