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STRUCTURE OF HIGH-ORDER WATER CLUSTERS OF $\beta$-PROPIOLACTONE BY BROADBAND MICROWAVE SPECTROSCOPY

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/52611

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Title: STRUCTURE OF HIGH-ORDER WATER CLUSTERS OF $\beta$-PROPIOLACTONE BY BROADBAND MICROWAVE SPECTROSCOPY
Creators: Neill, Justin L.; Perez, Cristobal; Muckle, Matt T.; Pate, Brooks H.; Pena, Isabel; Lopez, Juan C.; Alonso, Jose L.
Issue Date: 2012
Publisher: Ohio State University
Abstract: The rotational spectra of $\beta$-propiolactone-(H$_2$O)$_n$ (n=1-5) adducts have been extensively analyzed by broadband microwave spectroscopy (CP-FTMW). Unambiguous identification of their structures has been achieved from the spectra of the parent species and H$_2^{18}$O single substitution clusters and Stark effect measurements. In addition to our previous work, the substitution structures for two n=4 and one n=5 complexes are presented. The three structures show a cyclic arrangement in the oxygen framework. For both n=4 structures, the water molecules form a quasiplanar ring that sits above the BPL unit. The structural differences between these two n=4 complexes are discussed in terms of the water oxygen atom positions and dipole moment orientations, enabling to distinguish between isomers with certainty by CP-FTMW spectroscopy. For n=5, a cyclic arrangement similar to n=4 was found with water molecules making a puckered five-water ring. Substitution coordinates for the oxygen framework support the assignment. Our results show that complexation with BPL induces measurable structural changes in the (H$_2$O)$_n$ (n = 3, 4, 5) pure water clusters. This fact is also discussed in terms of the variation in O-O distances within pure and complexed water clusters.
URI: http://hdl.handle.net/1811/52611
Other Identifiers: 2012-MH-14
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