Electron spin resonance and electrospray ionization mass spectroscopic studies of the interaction of alkali and alkaline earth cations with manganese bis(μ-oxo) dimers
| Autor: | Colin P. Horwitz, Joseph T. Warden, Susan T. Weintraub |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Alkaline earth metal
Valence (chemistry) Electrospray ionization Dimer Inorganic chemistry chemistry.chemical_element Manganese Alkali metal Ion law.invention Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry law Materials Chemistry Physical and Theoretical Chemistry Electron paramagnetic resonance |
| Zdroj: | Inorganica Chimica Acta. 246:311-320 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/0020-1693(96)05078-5 |
| Popis: | The dimer [(3,3′-17-crown-6-SALPN)Mn IV (μ-O)] 2 ( 2 ) was prepared by the reaction of (3,3′-17-crown-6-SALPN)Mn(II) with O 2 in CH 3 CN. Dimer 2 when reacted with two molar equivalents of NaPF 6 , KPF 6 , CaTf 2 or BaTf 2 (Tf − is SO 3 CF 3 − formed the complexes 2 · 2NaPF 6 , 2 ·KPF 6 , 2 ·2CaTf 2 or 2 ·2BaTf 2 , respectively. The dimers were reduced to the mixed-valent Mn III ,Mn IV state either chemically with Cp 2 Co or electrochemically and their ESR spectra recorded. The ESR spectrum of each mixed-valent dimer showed a 16-line pattern characteristic of a valence trapped antiferromagnetically coupled species. The cation containing Mn IV ,Mn IV bis(μ-oxo) dimers were also analyzed by electrospray ionization mass spectrometry using CH 2 Cl 2 and CH3CN as solvents. Singly charged cations corresponding to the loss of one anion from the parent complex were observed for all four compounds. In addition, ions were detected in which cation exchange had occurred. |
| Databáze: | OpenAIRE |
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