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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
Published on: August 12, 2019
Gaseous iron(II) and iron(III) complexes with BINOLate ligands
Sophie Rochut1, Jana Roithová, Detlef Schröder
1Université Pierre et Marie Curie, LADIR, Paris, France.
Journal of the American Society for Mass Spectrometry
|December 8, 2007
Summary
Electrospray ionization generates iron-BINOL complexes, with structures controlled by iron
Area of Science:
- Organometallic Chemistry
- Mass Spectrometry
- Coordination Chemistry
Background:
- 1,1'-bi-2-naphthol (BINOL) is a versatile chiral ligand.
- Iron complexes with organic ligands are crucial in catalysis.
- Electrospray ionization (ESI) is a powerful tool for generating and analyzing molecular ions.
Purpose of the Study:
- To investigate the formation and fragmentation of iron-BINOL complexes using ESI.
- To control the structure of iron-BINOL complexes by varying iron precursor oxidation state.
- To elucidate fragmentation pathways of these complexes under collision-induced dissociation.
Main Methods:
- Electrospray ionization (ESI) of BINOL and iron(II)/iron(III) sulfate in methanol/water.
- Mass spectrometry for ion generation and selection.
- Collision-induced dissociation (CID) for fragmentation analysis.
Main Results:
- Monocationic iron-BINOL complexes with varying degrees of BINOL deprotonation and methanol coordination were generated.
- Iron(II) sulfate yielded [(BINOLate)Fe(CH3OH)n]+ (n=0-3), while iron(III) sulfate yielded [(BINOLdiate)Fe(CH3OH)n]+ (n=0-2).
- CID revealed distinct fragmentation patterns, including methanol loss, decarbonylation for iron(III) species, and FeOH loss for iron(II) species, leading to ionized 1,1'-dinaphthofurane.
Conclusions:
- ESI enables controlled synthesis of iron-BINOL complexes based on iron oxidation state.
- Fragmentation analysis provides insights into the stability and structure of these complexes.
- The study demonstrates the utility of ESI-MS/MS for characterizing organometallic complexes.
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