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Articles you may be interested inInelastic neutron scattering studies of some intramolecular hydrogen bonded complexes: A new correlation of γ(OHO) vs R (OO) J. Chem. Phys. 78, 3150 (1983) between the two distances is still significant. The asymmetry of the short hydrogen bonds appears somewhat more pronounced at 298 K than at the lower temperatures. A corresponding shift with temperature of the H atom in the short intramolecular hydrogen bond was found previously in 2,3-pyridinedicarboxylic acid, which has a molecular geometry similar to that found here.

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Ikaite, CaC0 3 · 6 H 2 0, is monoclinic, C2/c, with a = 8.792(2), b = 8.310(2), c = 11.021(2) Α, β = 110.53(5)°, Ζ = 4. With 2205 independent reflections taken at -25 °C of a naturally grown crystal specimen the structure was refined to a weighted R w = 0.028. The C0 3 group is planar with C-O distances 1.279(2) and 1.290(1) (2 χ) Â. The hydrogen bond network is determined. The optical behaviour is explained by structural characteristics.