A gas-phase study of ligand effects on the reactivity of organometallic distonic ion Fe(p-benzyne)+˙
✍ Scribed by Young C. Xu; Quan Chen; Sara K. Poehlein; Ben S. Freiser
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 91 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0951-4198
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✦ Synopsis
This paper reports a gas-phase study of ligand effects on the reactivity of the organometallic distonic ion Fe(p-benzyne) Á . New organometallic distonic ions are generated by introducing a benzene ligand onto the metal center of Fe(p-benzyne) Á . We were interested in whether the reactivity of the radical site would be enhanced by 'covering' the metal center with extra ligands, i.e. by forming (benzene)Fe(p-benzyne) Á , since, in general, attachment of ligands reduces the reactivity of the metal center. For comparison, ions formed by attaching the same ligand to Fe(o-benzyne) and Fe(phenyl) were also studied. Reacting Fe(p-benzyne) Á , Fe(o-benzyne) and Fe(phenyl) directly with benzene generates, presumably, (benzene)Fe(p-benzyne) Á , (benzene)Fe(o-benzyne) and (benzene)Fe(phenyl) , respectively. With allyl iodide, isopropyl iodide and dimethyl disulfide, (benzene)Fe(p-benzyne) Á reacts differently from its even-electron isomer, (benzene)-Fe(o-benzyne) , and its phenyl analogue, (benzene)Fe(phenyl) . Furthermore, the results from these ionmolecule reactions and collision-induced dissociation of selected product ions indicate that the charge site and the radical site of (benzene)Fe(p-benzyne) Á interact with the neutral simultaneously and that the attachment of the benzene ligand does enhance the reactivity of the radical site to some extent.