Proton transfer and polarity changes in ionic liquid–water mixtures: a perspective on hydrogen bonds from ab initio molecular dynamics at the example of 1-ethyl-3-methylimidazolium acetate–water mixtures—Part 1

2012 ◽  
Vol 14 (15) ◽  
pp. 5030 ◽  
Author(s):  
Martin Brehm ◽  
Henry Weber ◽  
Alfonso S. Pensado ◽  
Annegret Stark ◽  
Barbara Kirchner
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquid ◽  
Hydrogen Bonds ◽  
Proton Transfer ◽  
Ab Initio ◽  
Liquid Water ◽  
Ab Initio Molecular Dynamics

Entropy of Liquid Water from Ab Initio Molecular Dynamics

2011 ◽  
Vol 115 (48) ◽  
pp. 14190-14195 ◽  
Author(s):  
Cui Zhang ◽  
Leonardo Spanu ◽  
Giulia Galli
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Liquid Water ◽  
Ab Initio Molecular Dynamics

Melting of Hydrogen Bonds in Uracil Derivatives Probed by Infrared Spectroscopy and ab Initio Molecular Dynamics

2012 ◽  
Vol 116 (15) ◽  
pp. 4626-4633 ◽  
Author(s):  
Zsolt Szekrényes ◽  
Katalin Kamarás ◽  
György Tarczay ◽  
Anna Llanes-Pallás ◽  
Tomas Marangoni ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Infrared Spectroscopy ◽  
Hydrogen Bonds ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Uracil Derivatives

A prototypical ionic liquid explored by ab initio molecular dynamics and Raman spectroscopy

2013 ◽  
Vol 139 (14) ◽  
pp. 144309 ◽  
Author(s):  
E. Bodo ◽  
A. Sferrazza ◽  
R. Caminiti ◽  
S. Mangialardo ◽  
P. Postorino
Keyword(s):  
Molecular Dynamics ◽  
Raman Spectroscopy ◽  
Ionic Liquid ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics

scholarly journals Ab initio molecular dynamics simulation of liquid water by quantum Monte Carlo

2015 ◽  
Vol 142 (14) ◽  
pp. 144111 ◽  
Author(s):  
Andrea Zen ◽  
Ye Luo ◽  
Guglielmo Mazzola ◽  
Leonardo Guidoni ◽  
Sandro Sorella
Keyword(s):  
Molecular Dynamics ◽  
Monte Carlo ◽  
Molecular Dynamics Simulation ◽  
Ab Initio ◽  
Liquid Water ◽  
Quantum Monte Carlo ◽  
Dynamics Simulation ◽  
Ab Initio Molecular Dynamics

scholarly journals Proton Transfer from a Photoacid to Water: First Principles Simulations and Fast Fluorescence Spectroscopy

2021 ◽  
Author(s):  
Alice R. Walker ◽  
Boning Wu ◽  
Jan Meisner ◽  
Michael D. Fayer ◽  
Todd J. Martinez
Keyword(s):  
Molecular Dynamics ◽  
Excited State ◽  
Fluorescence Spectroscopy ◽  
Proton Transfer ◽  
Ab Initio ◽  
Time Constant ◽  
Emission Wavelength ◽  
Ab Initio Molecular Dynamics ◽  
Long Distance ◽  
Hydrogen Bonded

Proton transfer reactions are ubiquitous in chemistry, especially in aqueous solutions. We investigate photo-induced proton transfer between the photoacid 8-hydroxypyrene-1,3,6- trisulfonate (HPTS) and water using fast fluorescence spectroscopy and ab initio molecular dynamics simulations. Photo-excitation causes rapid proton release from the HPTS hydroxyl. Previous experiments on HPTS/water described the progress from photoexcitation to proton diffusion using kinetic equations with two time constants. The shortest time constant has been interpreted as protonated and photoexcited HPTS evolving into an “associated” state, where the proton is “shared” between the HPTS hydroxyl and an originally hydrogen bonded water. The longer time constant has been interpreted as indicating evolution to a “solvent separated” state where the shared proton undergoes long distance diffusion. In this work, we refine the previous experimental results using very pure HPTS. We then use excited state ab initio molecular dynamics to elucidate the detailed molecular mechanism of aqueous excited state proton transfer in HPTS. We find that the initial excitation results in rapid rearrangement of water, forming a strong hydrogen bonded network (a “water wire”) around HPTS. HPTS then deprotonates in ≤3 ps, resulting in a proton that migrates back and forth along the wire before localizing on a single water molecule. We find a near linear relationship between emission wavelength and proton-HPTS distance over the simulated time scale, suggesting that emission wavelength can be used as a ruler for proton distance. Our simulations reveal that the “associated” state corresponds to a water wire with a mobile proton and that the diffusion of the proton away from this water wire (to a generalized “solvent-separated” state) corresponds to the longest experimental time constant.

Effect of anion reorientation on proton mobility in the solid acids family CsHyXO4 (X = S, P, Se, y = 1, 2) from ab initio molecular dynamics simulations

2020 ◽  
Vol 22 (19) ◽  
pp. 10738-10752 ◽  
Author(s):  
Christian Dreßler ◽  
Daniel Sebastiani
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Proton Transfer ◽  
Ab Initio ◽  
Solid Acids ◽  
Ab Initio Molecular Dynamics ◽  
Proton Mobility ◽  
Transfer Rates ◽  
High Proton ◽  
Dynamics Simulations

The high temperature phases of the solid acids CsHSeO4, CsHSO4 and CsH2PO4 show extraordinary high proton conductivities, which are enabled by the interplay of high proton transfer rates and frequent anion reorientation.

scholarly journals Ab initio molecular dynamics studies of formic acid dimer colliding with liquid water

2018 ◽  
Vol 20 (36) ◽  
pp. 23717-23725 ◽  
Author(s):  
Vesa Hänninen ◽  
Garold Murdachaew ◽  
Gilbert M. Nathanson ◽  
R. Benny Gerber ◽  
Lauri Halonen
Keyword(s):  
Molecular Dynamics ◽  
Density Functional Theory ◽  
Formic Acid ◽  
Ab Initio ◽  
Molecular Dynamics Simulations ◽  
Liquid Water ◽  
Density Functional ◽  
Ab Initio Molecular Dynamics ◽  
Functional Theory ◽  
Dynamics Simulations

Ab initio molecular dynamics simulations of formic acid (FA) dimer colliding with liquid water at 300 K have been performed using density functional theory.

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