Entropy-driven rearrangement of the water network at the hydrated amide group of the trans-formanilide–water cluster in the gas phase
Literature Information
Kenji Sakota, Yuiga Shimazaki, Hiroshi Sekiya
Photoionization-induced rearrangement of the water network in the trans-formanilide 1 ∶ 4 cluster, FA–(H2O)4, has been investigated by using IR-photodissociation spectroscopy and quantum chemical calculations. The IR spectrum of FA–(H2O)4 in the S0 state shows that the observed cluster has a cyclic hydrogen-bonded structure where the CO group and the NH group of FA are bridged with four water molecules, consistent with the reported structure [E. G. Robertson, Chem. Phys. Lett., 2000, 325, 299]. However, the corresponding cyclic hydrogen-bonded structure in the D0 state of [FA–(H2O)4]+ is a minor product arising from photoionization via the S1–S0 origin of FA–(H2O)4. The dominant product has an extended H-bonded structure, where the intermolecular hydrogen bond between the hydrogen of the OH group of a water molecule and the CO group is dissociated. This is the first observation of a photoionization-induced rearrangement of the water network in [FA–(H2O)4]+. Through DFT calculations, we conclude that the rearrangement occurs due to entropic effects.
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![(3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure (3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure](https://static.chemtradehub.com/structs/538/53800-21-8-9f18.webp)



![5-Bromo-3-isopropyl-1H-pyrrolo[2,3-b]pyridine structure 5-Bromo-3-isopropyl-1H-pyrrolo[2,3-b]pyridine structure](https://static.chemtradehub.com/structs/125/1256819-54-1-8620.webp)