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The structure and photophysics of clusters of immiscible liquids: C6H6(H2O)n

✍ Scribed by Albert J. Gotch; Aaron W. Garrett; Daniel L. Severance; Timothy S. Zwier

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
843 KB
Volume
178
Category
Article
ISSN
0009-2614

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✦ Synopsis

Mixed clusters of C&. and HZ0 of type C,H,(H,O). where n= l-5 have been studied using one-color resonance-enhanced two-photon ionization coupled with time-of-flight mass spectrometric detection. The 1: 1 complex is seen to have an electronically forbidden origin with intensity at least 1000 times less than that at 6;. The Hz0 molecule thus lies on the sixfold axis of benzene and is undergoing free internal rotation about this axis. The blue-shift and high efficiency of fragmentation of the I : 1 complex argue for hydrogen bonding of the Hz0 molecule to the benzene x cloud. The 1: 2 complex induces a strong origin with intensity 14% of that at 66. The rotational band contour yields a geometry in which the two water molecules bind to benzene on one side of the benzene ring, with a H20-Hz0 separation close ta that in the water dimer. Higher 1 :n clusters show spectra which suggest structures involving a network of hydrogen bonded water molecules building up away fmm the benzene ring, consistent with a microscopic immiscibility of C& and HzO.

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