The photophysics of a photoreactive system in a supersonic jet. Styrene-trimethylamine

Styrene Clusters in a Supersonic Jet: Reactive and Nonreactive Systems

“…It is seen that the relative intensities of the individual bands in the two series vary considerably across the spectrum and are different for the LIF and REMPI spectra. As shown in the preliminary report, excitation of the “n” type origin band led to a locally excited type fluorescence, as observed for all previously discussed styrene clusters. However, excitation to higher energy members of this series or to “w” type bands at any frequency (including the 0−0 band) led to a different emission spectrum whose characteristics resemble exciplex emission as observed in solution and in other jet-cooled systems .…”

“…It was proposed that the latter must rotate by 180°i n order for the electron to transfer, and the barrier for this rotation was calculated to be about 100 cm -1 . 69 It is noted that a recent calculation on the similar naphthalene-triethylamine system 26 arrived at similar conclusionssthe exciplex state may be reached by a barrier-free process from one ground-state conformer, whereas excitation of a different conformer yields initially a state that can transform to the exciplex only by surmounting a barrier. These results are in qualitative agreement with the experimental data of ref 95. Furthermore, an ab initio calculation of two structures of the benzene-TMA 1:1 cluster 96 gives very similar binding energies to those calculated here for the styrene-TMA cluster.…”

“…The geometries of the species giving rise to the "n" and "w" type series were calculated using pairwise potentials as described before. 69 (The geometries of styrene 93 and of TMA 94 were assumed to be unchanged by cluster formation.) Their forms are reproduced in Figure 11.…”

“…We therefore will begin by discussing an atomic partner (argon), then continue with polyatomic nonreactive ones (CO 2 , ammonia), and finally end up with a small amine−trimethylamine. A preliminary report of this work appeared in ref .…”

Mass analyzed threshold ionization spectroscopy of p-fluorostyrene

“…[1][2][3][4][5][6] The primary reason for interests to this class of compounds is because they are the constituents of many of the important synthetic polymeric materials. Styrene is the building unit of the poly-͑p-phenylene vinylene͒ ͑PPV͒ class of conducting polymeric materials known for their electroluminescent and semiconducting properties.…”