2026-05-18T15:06:40Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/463002025-09-17T07:03:38Zcom_10324_1186com_10324_931com_10324_894col_10324_1404

00925njm 22002777a 4500 dc López Alonso, Juan Carlos author Pérez Cuadrado, Cristobal author Blanco Rodríguez, Susana author Shubert, V. Alvin author Temelso, Berhane author Shields, George C. author Schnell, Melanie author 2019 15‐crown‐5 ether (15C5) and its complexes with water (w) have been studied using broadband Fourier transform microwave spectroscopy in a supersonic jet. A new conformer of 15C5 has been observed and established as the new global minimum out of a total of nine isolated structures. In addition, two 15C5‐w and two 15C5‐w2 clusters have been observed. The cluster structures have been unambiguously identified through the observation of water 18O isotopologue spectra. In all the clusters, at least one water molecule, located close to the axis of the 15C5 ring, interacts through two simultaneous hydrogen bonds to the endocyclic oxygen atoms. This interaction reshapes the 15C5 ring to reduce its rich conformational landscape to only two open structures, related to those found in complexes with Li+ or Na+ ions. In the most abundant 15C5‐w2 form, the two water molecules repeat the same interaction scheme while binding to opposite sides of the ring. In the second most abundant dihydrated form the two water molecules lie on the same side of the ring. This finding is exceptionally rare because water‐water interactions typically prevail over the formation of additional solutewater contacts, and it showcases the particular binding features of crown ethers. Physical Chemistry Chemical Physics, 2019, 21, 2875-2881 1463-9076 http://uvadoc.uva.es/handle/10324/46300 10.1039/c8cp05552a 2875 6 2881 Physical Chemistry Chemical Physics 21 1463-9084 Espectroscopía de rotación Quimica Water induces the same crown shapes as Li+ or Na+ in 15-crown-5 ether: a broadband rotational study