Topological isomerism : Should rotaxanes, endohedral fullerene complexes and in-out isomers of hydrogenated fullerenes be considered as such?
✍ Scribed by Helena Dodziuk; Krzysztof S. Nowiński
- Book ID
- 104209141
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 728 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
✦ Synopsis
Rotaxanes are not considered to be topological isomers of their separated fragments. However, due to their similarity to catenenes, they are often discussed within the realm of topological chemistry. Similarly, "in" fullerene isomers (endohedial compleT.es, nested fullerems, and the iamners of hy&ogmated fnilerenes) have not, until recently, been treated as topological isomers of the corresponding "out" i~mers. In this paper the problem of topological isome~ is analysed departing from the standard topological nofiuns of arbilrery continuous deformations imposed on the system under investigatlun as a sufficient condition for topological isomerism. Similarly to the isomer classification into conformatlunal and configuratlonal isome~ the energy barrier between the trivial (e. g., separated rings) end non-trivial (e. g., catenated) topological stractmes should be invoked into such classifications to limit allowed deformations of the systems under investigatioe. A precise mathematical model of the classification, based on topological invarient& is pre'~ted in en Appendix.