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LASER PRODUCTION AND CHARACTERIZATION:CLUSTERS OF METAL WITH ORGANIC MOLECULES D. Catone, A. Paladini, D. Scuderi, A. Mele, M. Speranza, A. Giardini, Dipartimento di Chimica, Università di Roma “La Sapienza”, I-00185 Roma, Italy, M. Satta, CNR-Istituto Materiali Speciali, I-85050 Tito Scalo (Pz), Italy. The interest in the synthesis, structure, and reactivity of clusters of organic molecules with metal atoms is steadily rising due to their importance in biological processes and in many biotechnological applications. Insights into the energetics and the dynamics of metal-bound biomolecules under solvent free conditions can be obtained by using advanced methodologies like Pulsed Laser Ablation - Mass Spectrometry (PLA-MS), Mass-Resolved Resonant-Two-Photon-Ionization (R2PI-MS) coupled with a supersonic molecular beam, and ElectroSpray Tandem Mass Spectrometry (ESI-MS2). Here a study is reported on the photochemistry and spectroscopy of isolated complexes between metal atoms and biomolecules, including nucleic bases, amino acids, heme derivatives, produced by laser ablation in supersonic jets. The produced clusters are ionized by one or two tunable dye laser and eventually mass analyzed in a TOF mass spectrometer. Alternatively, the clusters are produced by laser ablation of solid metal/ligand mixtures using intense Nd:YAG laser pulses and mass analysed by a reflectron mass spectrometer. The experimental results are compared with theoretical predictions.
