NMR Study of the Ligand Interchange of Hexacyclen and Hexamethylhexacyclen Complexes with TI +  Ion in 70% Methanol Solution | Zendy

Shamsipur Mojtaba | Zendy; Alizadeh Naader | Zendy

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NMR Study of the Ligand Interchange of Hexacyclen and Hexamethylhexacyclen Complexes with TI + Ion in 70% Methanol Solution

Author(s) -

Shamsipur Mojtaba,

Alizadeh Naader

Publication year - 1998

Publication title -

journal of the chinese chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.329

H-Index - 45

eISSN - 2192-6549

pISSN - 0009-4536

DOI - 10.1002/jccs.199800039

Subject(s) - chemistry , methanol , kinetics , ligand (biochemistry) , ion exchange , proton nmr , proton , ion , inorganic chemistry , stereochemistry , organic chemistry , biochemistry , physics , receptor , quantum mechanics

The exchange kinetics of TI + complexes with hexacyclen and hexamethylhexacyclen were studied in 70% methanol solution by proton NMR line‐shape analysis. In TI + ‐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 TI + ‐hexamethylhexacyclen system solely prefers a dissociative exchange mechanism in entire temperature range studied. The corresponding exchange rates and the activation parameters E a , 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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