title: Infrared spectra of gas-phase V(+)-(benzene) and V(+)-(benzene)(2) complexes.
abstract: The organometallic ions V+-(benzene) and V+-(benzene)2 are produced by laser vaporization in a pulsed nozzle source. They are trapped and mass selected in an ion-trap/time-of-flight mass spectrometer, and their infrared spectra are measured with resonance-enhanced multiphoton photodissociation (IR-REMPD) spectroscopy with a tunable free-electron laser. Vibrational bands in the 600-1800 cm-1 region are characteristic of the benzene molecular moiety perturbed by the metal cation bonding. Experimental data are compared to the IR spectra derived from density functional calculations. Vibrational patterns in V+-(C6H6) indicate that the metal is bound in an eta6 pi-bonding configuration, while V+-(C6H6)2 is a sandwich. Trapped-ion IR-REMPD is a general method to access the vibrational spectroscopy of organometallic ions and their clusters.
authors.affiliation: FOM-Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands.
authors.forename: D
authors.initials: D
authors.lastname: van Heijnsbergen
authors.forename: G
authors.initials: G
authors.lastname: von Helden
authors.forename: G
authors.initials: G
authors.lastname: Meijer
authors.forename: P
authors.initials: P
authors.lastname: Maitre
authors.forename: M A
authors.initials: MA
authors.lastname: Duncan
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods; D014639:Vanadium / Q000737:chemistry*
chemical_list: D001555:Benzene Derivatives; D009942:Organometallic Compounds; D014639:Vanadium