- 作者: Mojtaba Shamsipur and Naader Alizadeh
- 中文摘要: The exchange kinetic of Tl+ complexes with hexacylen and hexamethylhexacyclen were studied in 70% methanol solution by proton NMR line-shape analysis. In Tl+-hexacyclen system, a dissociative mechanism is found to be predominant at higher temperatures, while a bimolecular pathway may become more important at lower temperatures. In contrast, the Tl+-hexamethylhexacyclen system solely prefers a dissociative exchange mechanism in entire temperature range studied. The corresponding exchange rates and the activation parameters Ea, ΔH++,ΔS++ and ΔG++ for the exchange have been determined, and the possible parameters controlling the exchange rates and mechanisms are discussed.
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