One- and two-color spectroscopy of pirydylindoles and related compounds and their molecular complexes in supersonic jets
Y. Nosenko
Goal: The studies of the photoreactivity of molecular complexes isolated in supersonic jets.

Object: Pyridylindoles and their H-bonded complexes with protic solvents (figure).

Method: Laser spectroscopy in supersonic jets and molecular beams.

Results: The laser induced fluorescence (LIF) excitation spectrum of PyIn-0 (planar cis form is most stable) has been described by comparison with 2-phenylindole and theoretical calculations [ 1 ]. The spectrum of PyIn-2 is much more congested due to the presence of aliphatic chain and lowering the symmetry down to C1.

Recently, we have found that deuteration of PyIn-0 involves both NH and CH groups of the pyrrole ring. This assignment is supported by DFT and ab initio calculations for both ground and excited state [to be publ.].

No fluorescence from the PyIn-0 and PyIn-2 molecular clusters with water and methanol in supersonic jet is observed so far. In contrary this type of complexes of 3,2'-dimethylene-2-phenylindole were readily detected. These studies are continued by mass-selected two-colour-two-photon ionization method. Ionization potentials of PyIn-2(methanol)n (n=1..3) complexes have been found at least 3500 - 5500 cm-1 below this of the parent molecule.

Further studies should answer the following questions:
    How does the reactivity depend on the solvent?
    How does the reactivity depend on cluster size?

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