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Issue 3, 2016
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Infrared spectra reveal box-like structures for a pentamer and hexamer of mixed carbon dioxide–acetylene clusters

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Abstract

Except for a few cases like water and carbon dioxide, identification and structural characterization of clusters with more than four monomers is rare. Here, we provide experimental and theoretical evidence for existence of box-like structures for a pentamer and a hexamer of mixed carbon dioxide–acetylene clusters. Two mid-infrared cluster absorption bands are observed in the CO2ν3 band region using a tunable diode laser to probe a pulsed supersonic jet. Each requires the presence of both carbon dioxide and acetylene in the jet, and (from observed rotational spacings) involves clusters containing about 4 to 7 molecules. Structures are predicted for mixed CO2 + C2H2 clusters using a distributed multipole model, and the bands are assigned to a specific pentamer, (CO2)3–(C2H2)2, and hexamer, (CO2)4–(C2H2)2. The hexamer has a box-like structure whose D2d symmetry is supported by observed intensity alternation in the spectrum. The pentamer has a closely related structure which is obtained by removing one CO2 molecule from the hexamer. These are among the largest mixed molecular clusters to be assigned by high-resolution spectroscopy.

Graphical abstract: Infrared spectra reveal box-like structures for a pentamer and hexamer of mixed carbon dioxide–acetylene clusters

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Supplementary files

Article information


Submitted
02 Jul 2015
Accepted
19 Aug 2015
First published
21 Aug 2015

Phys. Chem. Chem. Phys., 2016,18, 1381-1385
Article type
Communication
Author version available

Infrared spectra reveal box-like structures for a pentamer and hexamer of mixed carbon dioxide–acetylene clusters

M. Rezaei, J. Norooz Oliaee, N. Moazzen-Ahmadi and A. R. W. McKellar, Phys. Chem. Chem. Phys., 2016, 18, 1381
DOI: 10.1039/C5CP03842A

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