title: IR and IR + UV spectroscopy of isolated [Al-AcPheOMe]n+ cluster cations (n = 1, 3).
abstract: Singly and triply charged cationic clusters of aluminium and the protected amino acid AcPheOMe are investigated in a supersonic beam by using a combination of a thermic and a laser ablation ion source. For the singly charged species UV- and IR photodissociation spectroscopy is applied. In the case of the triply charged clusters a variant of combined IR + UV spectroscopy is used to obtain information in the NH-stretching region. By comparison with DFT calculations structural assignments are suggested and it turns out that both clusters prefer a helical arrangement with aluminium being aggregated to both carbonyl groups. For the triply charged cluster a globular structure is formed in which aluminium is captured both by the carbonyl groups and the phenyl ring.
authors.affiliation: TU Kaiserslautern, Fachbereich Chemie & Research Center Optimas, Erwin-Schroedinger-Strasse 52, D-67663 Kaiserslautern, Germany.
authors.forename: P M
authors.initials: PM
authors.lastname: Bialach
authors.forename: T C
authors.initials: TC
authors.lastname: Martin
authors.forename: M
authors.initials: M
authors.lastname: Gerhards
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D007536:Isomerism; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D010649:Phenylalanine / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009942:Organometallic Compounds; D010649:Phenylalanine; D000535:Aluminum