title: Electrospray mass spectra of group 6 (Fischer) carbenes in the presence of electron-donor compounds.
abstract: Fischer carbene complexes 1-7 are not ionized under standard electrospray ionization (ESI) conditions. We report here that unsaturated chromium and tungsten (Fischer) carbene complexes can be ionized in an electrospray ion source in the presence of electron-donor compounds such as hydroquinone (HQ) or tetrathiafulvalene (TTF). The addition of these compounds, which seem to act as electron transfer agents, permits the recording and study of their ESI mass spectra in the negative mode of detection. Both chromium and tungsten(0) carbene complexes undergo in the first fragmentation stage a double simultaneous decarbonylation process.
authors.affiliation: Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Sierra
authors.forename: M
authors.initials: M
authors.lastname: Gómez-Gallego
authors.forename: M J
authors.initials: MJ
authors.lastname: Mancheño
authors.forename: R
authors.initials: R
authors.lastname: Martínez-Alvarez
authors.forename: P
authors.initials: P
authors.lastname: Ramírez-López
authors.forename: N
authors.initials: N
authors.lastname: Kayali
authors.forename: A
authors.initials: A
authors.lastname: González
mesh_terms: D002857:Chromium / Q000737:chemistry; D004583:Electrons; D006571:Heterocyclic Compounds / Q000737:chemistry; D006838:Hydrocarbons; D006873:Hydroquinones / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008697:Methane / Q000031:analogs & derivatives* / Q000032:analysis*; D009570:Nitriles / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014048:Tolonium Chloride / Q000737:chemistry; D014414:Tungsten / Q000737:chemistry
chemical_list: D006571:Heterocyclic Compounds; D006838:Hydrocarbons; D006873:Hydroquinones; D007477:Ions; D009570:Nitriles; D002857:Chromium; C013703:tetracyanoquinodimethane; D014048:Tolonium Chloride; C030011:carbene; C063887:tetrathiafulvalene; D008697:Methane; D014414:Tungsten; C031927:hydroquinone