Intracluster electron transfer from a metal atom/cluster followed by anionic oligomerization of vinyl molecules |
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Authors: | K Ohshimo H Tsunoyama F Misaizu K Ohno |
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Institution: | (1) Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan, JP |
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Abstract: | Intracluster electron transfer and oligomerization reaction were investigated by mass spectrometry of clusters of alkali metal
atom (M) with acrylonitrile (AN; CH2=CHCN). In the photoionization mass spectra of M(AN)n, magic numbers were clearly observed at n = 3k (k = 1-4 for M = Na and K, k = 1 for M = Li). The results of photodissociation of neutral K(AN)n indicate that the n = 3 cluster has an anomalous stability relative to other sizes of clusters. The C=C bond in vinyl molecules is also found
to be necessary to form the magic numbers by measuring the photoionization mass spectrum of K atom with propionitrile. These
results strongly support the intracluster anionic oligomerization reaction initiated by electron transfer from the alkali
atom. The quantum chemical calculations have revealed that the evaporation induced by excess energy generated by intracluster
oligomerization is important to form the magic numbers in the present clusters.
Received 29 November 2000 |
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Keywords: | PACS 36 40 -c Atomic and molecular clusters – 36 40 Jn Reactivity of clusters – 36 40 Mr Spectroscopy and geometrical structure of clusters – 82 35 -x Polymer: properties reactions polymerization |
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