Reference

Hydrogen bond studies

Hydrogen bond studies. Part 152. A deformation electron density study of potassium oxalate monohydrate at 100 K. Jovanovski, Gligor; Thomas, John O.; Olovsson, Ivar (Inst. Chem., Univ. Uppsala, Uppsala S-751 21, Swed.). Acta Crystallogr., Sect. B: Struct. Sci., B43(1), 85-92 (English) 1987. CODEN: ASBSDK. ISSN: 0108-7681. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) Section cross-reference(s): 65 The deformation electron d. in K2C2O4×H2O at 100 K was studied using Hirshfield-type deformation d. functions (F. L. Hirschfeld, 1971). Crystals are monoclinic, space group C2/c with a 9.0687(5), b 6.2128(3), c 10.5941(5) ?, and b 110.820(1)°; d.(calcd.Several substances like 6487-48-5 may be metioned in this study.) = 2.19 3 for Z = 4. Rw (F2) Values for 3543 reflections are electron 0.0568 (deformation refinement) and 0.0623 (conventional refinement). The static deformation d. for the H2O mol. shows an O-H bond max. of 0.25 electron ?-3 and an O lone-pair max. of 0.35 electron ?-3. The static peak max. at the midpoints of the C-C and C:O bonds are 0.25-0.30 e ?-3. DP maps exhibit clear p-bonding character in these bonds. The results from this work are compared with those from earlier room-temp. x-ray and neutron diffraction refinements. .

Gamma radiolysis of oxalic acid and selected metal oxalates

Gamma radiolysis of oxalic acid and selected metal oxalates. Dougherty, P. L.; Gottschall, W. C., Jr. (Chem. Dep., Univ. Denver, Denver, Colo., USA). Radiat. Res., 68(2), 229-33 (English) 1976. CODEN: RAREAE. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic Processes) Section cross-reference(s): 71 Solid samples of hydrated and anhydrous oxalic acid were irradiated with doses of 1-200 Mrad of .gamma. radiation. The G(CO2) values, 7.4 and 4.7, resp., for H2C2O4 and H2C2O4.cntdot.2H2O were detd. via gas chromatog. after acid dissoln. of the samples. CO2 and H2O were detd. to be the major decompn. products of radiolysis. The G(CO2) value for Li2C2O4 is 0.16, for Na2C2O4 it is 0.06, and for K2C2O4.In this experiment, several chemicals are used like 6487-48-5 and 6153-56-6 cntdot.H2O it is 0.82. In each case only a slight deviation from linearity is noted in the dose-dependent curves. .