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The chemical shift of deprotonated water dimer: ab initio path integral simulation
Motoyuki Shiga1, Kimichi Suzuki, Masanori Tachikawa
1CCSE, Japan Atomic Energy Agency, Higashi-Ueno 6-9-3, Taito-ku, Tokyo 110-0015, Japan. shiga.motoyuki@jaea.go.jp
Abstract:
The (1)H NMR chemical shift in deprotonated water dimer H(3)O(2)(-) has been studied by ab initio path integral simulation. The simulation predicts that the isotropic shielding of hydrogen-bonded proton increases as a function of temperature by about 0.003 ppm/K. This change is about an order of magnitude larger than that of the nonhydrogen-bonded proton. It is concluded that this is caused by the significant difference in the quantum distribution of proton at high and low temperatures in the low barrier hydrogen bond.
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