Journal
CHEMICAL SCIENCE
Volume 13, Issue 37, Pages 11119-11125Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2sc03189b
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Funding
- University of California Merced
- German Research Foundation (DFG) [LA 4442/1-1]
- NSF [OAC-2019144]
- Resnick Sustainability Institute at the California Institute of Technology
- Deutsche Forschungsgemeinscha. (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2033 - 390677874 - RESOLV]
- individual DFG [MA 1547/19]
- German Federal Ministry of Education and Research
- Ministry of Culture and Research of North Rhine-Westphalia
- Studienstiftung des deutschen Volkes
- Alexander von Humboldt-Stiftung
- High Performance Computing Center in Stuttgart (HLRS)
- state of Baden-Wurttemberg [bw18K011]
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This study reveals that the interplay between proton transfer and water wagging in the protonated water dimer is more complex and sensitive to subtle energetic changes than previously thought. By comparing infrared spectra obtained with two highly accurate potential energy surfaces and conducting highly accurate state-resolved quantum simulations, the researchers discovered previously overlooked low-intensity satellite peaks in the experimental spectrum and mechanistically assigned them.
The infrared (IR) spectra of protonated water clusters encode precise information on the dynamics and structure of the hydrated proton. However, the strong anharmonic coupling and quantum effects of these elusive species remain puzzling up to the present day. Here, we report unequivocal evidence that the interplay between the proton transfer and the water wagging motions in the protonated water dimer (Zundel ion) giving rise to the characteristic doublet peak is both more complex and more sensitive to subtle energetic changes than previously thought. In particular, hitherto overlooked low-intensity satellite peaks in the experimental spectrum are now unveiled and mechanistically assigned. Our findings rely on the comparison of IR spectra obtained using two highly accurate potential energy surfaces in conjunction with highly accurate state-resolved quantum simulations. We demonstrate that these high-accuracy simulations are important for providing definite assignments of the complex IR signals of fluxional molecules.
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